|
Search of All Forums Enter your search criteria. Click here for tips on using our search |
For Sale Ads |
1: Gag Me With a Spoon = JBL EON (0.00)
Posted by djk on 2004-08-17, 01:44:03 (208.252.113.39)
A Klipsch Heresy sounds much better and a pair may be had used for around $400. .......
2: Bi-amp & Passive Pre (0.00)
Posted by djk on 2002-11-01, 02:45:47 (206.24.61.227)
"If you don't want to disconnect the internal crossover then you shouldn't bother with line level crossovers at all." I agree with Bob on this one. As regards a passive preamp feeding a passive bi-amp .......
3: Caps ? (0.00)
Posted by djk on 2002-10-30, 01:13:43 (206.24.61.200)
Most likely the cap in the feedback loop to ground had dried out. In the 3020 schematic this would be C615, the 1000µF 6.3V cap in series with the 27 ohm R631. Most of these caps will have started to .......
4: Fooling Ourselves (0.00)
Posted by djk on 2002-10-03, 01:59:29 (206.24.61.239)
I used to sell high end stereo equipment. A five year old child with a head cold wouldn't be fooled by the best stereo. It is more of how easy is it for you to suspend disbelief when listening to your .......
5: BBQ (0.00)
Posted by djk on 2002-09-22, 18:59:39 (206.24.61.175)
(belch) .......
6: Re: biamping yr existing spkrs (0.00)
Posted by djk on 2002-09-08, 22:42:25 (206.24.61.169)
I don't want to have to join another group just to read one letter, why don't you cut and paste it here. .......
7: Reserve (0.00)
Posted by djk on 2002-08-08, 00:51:26 (206.24.61.202)
Since the auction closed for much higher than the minimum bid increment above the 2nd highest bidder it means that the reserve price was finally met. Snipe-ing would have done you no good in this case .......
8: Re: Can we connect 70V or 100V LMT speaker to an AV amplifier (0.00)
Posted by djk on 2002-08-08, 00:43:40 (206.24.61.202)
Sure, it will work just fine. It won't play real loud though. 100W/8R=28.3V, a 10W/70V speaker is 500R, so you could run 60 speakers per channel, but you will only be getting 1.6W per speaker. You wou .......
9: Re: Please help with dimmer noise (0.00)
Posted by djk on 2002-08-06, 02:28:10 (206.24.61.249)
DIMMERS Light-dimmer Interference Reduction. Radio Amateurs who've have been cursed with RFI from solid-state light dimmers will be interested to know that at least one domestic manufacturer - Lutr .......
10: Gizmo (0.00)
Posted by djk on 2002-07-28, 05:03:25 (206.24.61.204)
Gizmo could make audio sound like pornography, couldn't he? I sold his gear in the late 80's before NYAL tanked. While very seductive sounding, it was also very euphonic. While some program material .......
11: $150 (nt) (0.00)
Posted by djk on 2002-07-25, 18:59:41 (206.24.61.136)
. .......
12: Lou Reed (0.00)
Posted by djk on 2002-07-08, 23:49:58 (206.24.61.168)
Don't ever try and work up covers for Lou Reed songs. You know you're in trouble when the audience starts requesting "the hatch a peanut on the bar" song (Willin') .......
13: Yes (0.00)
Posted by djk on 2002-07-07, 01:15:30 (206.24.61.148)
Yes, the amplifier's output impedance is in effect in parallel with the voice coil. But the voice coil's DCR is in series with the motional impedance of the loudspeaker. Thus the true DF is the motion .......
14: DCR (0.00)
Posted by djk on 2002-07-06, 19:20:59 (206.24.61.178)
"So the CDR is the sum of the coil resistance and the external, or amplifier, resistance." People always forget this. The DCR of the loudspeaker voice coil is in series with the generator (amplifier) .......
15: Re: Yamaha B1 power amp needs VFets! (0.00)
Posted by djk on 2002-07-05, 07:14:28 (206.24.61.210)
I think you're SOL. Yamaha made those in house. They are a non-standard case size depletion mode FET. There is no substitute. Built from 1974~1978, Yamaha dumped repair stock on those about ten years .......
16: Re: Help needed !!!!!!!!! (0.00)
Posted by djk on 2002-06-26, 00:52:04 (206.24.61.162)
Why do you want to know how to use the remote if you lost it? Am I missing something here? Meet me on top of the World Trade center and I'll make you a copy of the owner's manual. .......
17: Ha-Ha (0.00)
Posted by djk on 2002-06-16, 18:08:50 (206.24.61.233)
106dB/1W/1M and play 135dB + on a continuous bassis? With 1" driver? Lets see, 135-106=29dB, 29dB=800W, so you want a 1" driver that can handle 800W with no power compression? I'm sorry, I'm laughing .......
18: Re: DJ/mobile/pro amplifier as home amplifier (0.00)
Posted by djk on 2002-06-02, 22:54:20 (206.24.61.223)
The Crest CA6 sounds better than the QSC, Crown, and Carver PM series amps. Haven't heard the DAS. .......
19: Kosher Spam / Where do rats go when they die? (0.00)
Posted by djk on 2002-05-20, 00:43:40 (206.24.61.189)
Another Spam Poem =========== Pink tender morsel, Glistening with salty gel. What the hell is it? ----------- Ears, snouts and innards, A homogeneous mass. Pass another slice. ----------- Cube of cold .......
20: The Future of Piglet (0.00)
Posted by djk on 2002-05-19, 21:40:26 (206.24.61.189)
And a new hit from REM, Pig in a Blender! .......
21: Re: Yamaha cr-220 (0.00)
Posted by djk on 2002-05-18, 20:02:07 (206.24.61.192)
The CR220 was a huge POS.There are a bunch of service bulletins out on this thing.Your chances of fixing it without the shop manual are slim and none.Even if it worked you wouldn't have much. ::: TOPI .......
22: So What ! (0.00)
Posted by djk on 2002-05-11, 17:54:32 (206.24.61.232)
Gee, maybe you could help me. What specs mean it sounds good? I sold stereo equipment for many years and was never able to figure that one out. The NAD will probably sound better than most 100W home t .......
23: Re: what speakers did you use then? (0.00)
Posted by djk on 2002-05-08, 02:36:34 (206.24.61.249)
See page 5, a pdf file.Note the 12dB gain at 40hz in room.You don't get that outside.And yes, air sucks high frequencies.At 100ft here is actually about 10dB of excess loss at 10Khz beyond the expecte .......
24: Re: Anyone brought their hifi system to the open field before? (0.00)
Posted by djk on 2002-05-07, 01:59:07 (206.24.61.235)
No bass, and if very far away, no treble. Unless it is horn loaded. .......
25: Re: AC outlets -- 15 amps, 20 amps (0.00)
Posted by djk on 2002-05-07, 01:56:20 (206.24.61.235)
A 15A outlet has two paralled slots, II, a 20A outlet has an I and a sideways T.You can plug a 15A plug into a 20A outlet, but not the other way around.A power line conditioner makes no difference, wi .......
26: Big Fun ! (0.00)
Posted by djk on 2002-04-30, 03:14:18 (206.24.61.196)
Look at his buddy with the dormant account, cometdebris@earthlink.net http://cgi6.ebay.com/aw-cgi/eBayISAPI.dll?MfcISAPICommand=ViewListedItems&userid=cometdebris@earthlink.net&include=0&since=30&sort .......
27: 0.5V/µS (0.00)
Posted by djk on 2002-04-28, 17:47:02 (206.24.61.144)
The generally accepted minimum slew rate is 0.5V/µS per peak volt of output.This was suggested by Jung.He also suggested a maximum of 2V/µS, I think this was more of a stability and cost issue.To put .......
28: 2KW + 110dB (0.00)
Posted by djk on 2002-04-28, 17:19:23 (206.24.61.144)
I set up a small PA in a tent for a Halloween party.Nothing much.Four horn loaded 15s per side, two horn loaded 12s, a single 2" for highs.Tri-amped with audiophile quality 2KW total power, 24dB/oct e .......
29: 2105 (0.00)
Posted by djk on 2002-04-28, 07:14:42 (206.24.61.218)
First you need to check the outputs for shorts.If there are no shorts in the outputs you need to unsolder the rectifier from the transformer.If the fuse still blows the transformer is bad.The MC2105 h .......
30: Major Error ! (0.00)
Posted by djk on 2002-04-25, 01:01:34 (206.24.61.222)
Sorry about this! Unfortunately there is a time limit to edit your posts.Try this first.Buy a cheap extension cord.Cut one side of the cord, either side will do.Buy a 25A bridge recifier.Hook one of t .......
31: Editor ? (0.00)
Posted by djk on 2002-04-25, 00:03:46 (206.24.61.222)
All amplifiers sound the same! Helen Keller is the new editor of Sound and Vision magazine! .......
32: Re: CROWN DC300A (0.00)
Posted by djk on 2002-04-18, 18:01:35 (205.175.225.23)
The outputs are epitaxial (3Mhz) 2N3773, try a Motorola (ON) part. No sub on the IC. .......
33: Re-Boot ! (0.00)
Posted by djk on 2002-04-05, 02:04:17 (206.24.61.151)
Everybody out of the car, turn the key off then on, and everybody back in the car. At least once a day. .......
34: Balanced Power (0.00)
Posted by djk on 2002-03-29, 22:47:08 (206.24.61.159)
As also mentioned by JohnR, balanced power sounds better. 240V in the rest of the world is not the same as 240V in the USA. Jon Risch discusses balanced power in the Tweaks section. .......
35: YH-1 (0.00)
Posted by djk on 2002-03-17, 19:46:33 (206.24.61.167)
The YH-1 was $65, the YH-2 and YH-3 were $45 and $30.The HP-1 was $200.They had bass.Then they came out with a YH-100 that used the same transducer element as the HP-1 with a less expensive headband a .......
36: Yamaha (0.00)
Posted by djk on 2002-03-17, 19:39:38 (206.24.61.167)
The 1000 series was made from 74~78, the 1020 from 78~80 and the 1040 from 80~.So your CR-1040 is newer than the CR-2020.The 00 and 20 series had discrete semiconductors, the 40 has modules.I lined up .......
37: Capacitors (0.00)
Posted by djk on 2002-03-16, 19:05:14 (206.24.61.187)
You get the same bogus parts in Bryston, Mark Levinson, etc. Your attitude toward DIY is charming. I've been inside Rowland, Krell, Levinson, Accuphase, Audio Research, CJ, you name it. There is alway .......
38: Old McIntosh (0.00)
Posted by djk on 2002-03-16, 15:37:26 (206.24.61.159)
There are 4 electrolytic caps in the signal path of the McIntosh. There are no power supply bypass caps. Bypassing the coupling electrolytics with .1µF film types will make the McIntosh cleaner, quiet .......
39: Your Own Fault ! (0.00)
Posted by djk on 2002-02-24, 12:46:43 (206.24.61.224)
Do you blame your speeding tickets on the car you drive too? If you run a speaker after blowing the tweeter you will toast the network in short order if you keep playing it loud. The network will look .......
40: AVA Booster ? Not My Cup of Tea ! (0.00)
Posted by djk on 2002-02-24, 12:37:05 (206.24.61.224)
Not hardly. I've had two AVA amps and preamps, a total of four different items. I don't like the quality of the parts the uses, very low quality capacitors in the signal path, and cheap op-amps. The s .......
41: Patents ? (0.00)
Posted by djk on 2002-02-24, 12:22:31 (206.24.61.224)
"Nobody....has adopted any of his past "breakthrough" designs." Uhh, they were patented dude. Both Yamaha and Pioneer ended up in court with Bob. Bob won. It cost them millions of dollars. The M400 wa .......
42: I Paid Good Money.... (0.00)
Posted by djk on 2002-02-22, 03:33:57 (206.24.61.199)
To attend a concert where the artist ended up playing 'Flight of the Bumblebee' in his stocking feet on the 16' stop of a pipe organ. .......
43: Altec 1590 (0.00)
Posted by djk on 2002-02-12, 00:41:33 (206.24.61.224)
Not worth the money it takes to ship.Want another one? .......
44: Re: Who designed this piece ??? (0.00)
Posted by djk on 2002-02-10, 21:25:14 (206.24.61.225)
Jim Srickland would be my guess.I think I have the schematic somewhere. .......
45: AW50 (0.00)
Posted by djk on 2002-02-08, 18:05:24 (205.175.225.24)
I own two different AW50, they are 50W at 4R, not 8R. .......
46: Radio Shack (0.00)
Posted by djk on 2002-01-26, 21:21:51 (206.24.61.151)
Try this first.Buy a cheap extension cord.Cut one side of the cord, either side will do.Buy a 25A bridge recifier.Hook one of the cut wire ends to the + on the rectifier and the other cut wire end to .......
47: Re: impedance switches on receivers (0.00)
Posted by djk on 2002-01-26, 21:01:30 (206.24.61.151)
For the purpose of this discussion let us say your amp is 100W with a switch for either 8R or 4R operation.The switch lowers the voltage in the transformer in 4R mode.In 8R mode 100W is 40V and 5A pea .......
48: Bloated Bass cure for Bryston Amps (0.00)
Posted by djk on 2002-01-18, 00:43:00 (206.24.61.147)
It is very easy to cure the bloated/indistinct bass in a Bryston amplifier.Buy four pieces 22µF 100V capacitor and solder one in parallel with each main filter cap, two per channel.If you want more de .......
49: Re: Pass moving on from X-series? (0.00)
Posted by djk on 2002-01-12, 02:48:53 (206.24.61.168)
Nelson Pass The one and only Registered: Mar 2001 Location: Posts: 203 All other things equal, the X amps have more dynamic range and more control in the bottom end, while the Alephs are warmer in the .......
50: Belt ? (0.00)
Posted by djk on 2001-12-31, 01:03:56 (206.24.61.163)
A lot of people replace the figure 8 belt on these when the real problem is the foam pads on the back of the reel tables. .......
51: Rowland (0.00)
Posted by djk on 2001-12-31, 01:00:06 (206.24.61.163)
The $5,000+ Rowland uses the LM3886, about the same price as the LM3875 "The amplifier output section of the Concentra II contains six power amplifier circuits per channel, each capable of 150 watts o .......
52: Feedback (0.00)
Posted by djk on 2001-12-28, 18:57:18 (206.24.61.159)
The cap in the feedback loop to ground is the more likely culprit.Replace in both channels.Good time to upgrade. .......
53: Eggnog (0.00)
Posted by djk on 2001-12-28, 18:53:43 (206.24.61.159)
I guess somebody has to drink all the leftover eggnog! Too soon for April. .......
54: Re: Question: amp power and bi-amping (0.00)
Posted by djk on 2001-12-23, 02:21:45 (206.24.61.215)
If you use an electronic crossover and bi-amp a speaker like a Klipsch Cornwall with a 50W amp on the bass and a 10W amp on the mid and hf it will play as loud as a 400W amp through the passive crosso .......
55: Sure ! (0.00)
Posted by djk on 2001-12-18, 02:05:57 (206.24.61.148)
Just go to a music store and buy a gel, about $7.Get Roscolux, not Roscolene.They usually have a sample book to look through.A 'roadie' may be able to give you some scraps for free.Save the originals .......
56: I Own AVA (0.00)
Posted by djk on 2001-12-14, 01:09:09 (206.24.61.200)
For lots of $$$$ Frank gave me horrible sounding LF353 op-amps and non-bypassed electrolytic capaciors in the signal path.From this experience I must infer 1)he doesn't know everything 2)he doesn't he .......
57: Don't Do It ! (0.00)
Posted by djk on 2001-12-10, 00:41:05 (206.24.61.174)
The 12 is a real dual mono amp.To bridge it will require hooking the grounds together.Whenever I tried this the amp oscillated and burned up.If you really want to do this I would recommend you instead .......
58: Artificial Intelligence ? (0.00)
Posted by djk on 2001-12-02, 06:32:01 (206.24.61.143)
Someone that has a BS, a Masters, and a PHD. And is still an idiot. 90% of the engineering staff I have to work with meet this description. I get tired of explaining Ohm's Law to the latest recipent o .......
59: Diode (0.00)
Posted by djk on 2001-12-02, 06:10:25 (206.24.61.143)
The way I understand it DeForest stuck the extra element in there to avoid paying patent royalties on the diode.Didn't have a clue as to what he came up with. .......
60: Hazardous Waste ! (0.00)
Posted by djk on 2001-11-12, 15:14:36 (206.24.61.174)
Fortunately for you I am authorized to dispose of this piece properly.Send me an e-mail.I don't fix tuners. .......
61: Humm Fix for DH200s (0.00)
Posted by djk on 2001-11-12, 15:06:17 (206.24.61.174)
With the back of the amp facing you is it the left side that is causing the humm? I thought so.Very carefully take a short piece of wire and touch it to the shell of the left RCA plug and then the spe .......
62: What ? (0.00)
Posted by djk on 2001-11-04, 01:17:43 (206.24.61.184)
You mean I can't bi-amp my Lowthers? .......
63: Dirty Switch ! (0.00)
Posted by djk on 2001-11-03, 01:05:13 (206.24.61.206)
The record play switch is dirty.Put it in record and then stop it about 50 times.Newer models have a relay that serves this function.If yours has a relay replace the relay. .......
64: Spend $4 First (0.00)
Posted by djk on 2001-10-28, 19:52:47 (206.24.61.138)
Read this thread .......
65: Licensed VooDoo Practitioner (0.00)
Posted by djk on 2001-10-23, 03:23:42 (206.24.61.208)
30 years of being an audiophile qualifies me to be a Licensed VooDoo Practitioner. I get paid quite well to sit around and poke my fingers in stuff, slop a little solder here and there, and sometimes .......
66: It's a Mac (0.00)
Posted by djk on 2001-10-13, 02:41:11 (206.24.61.196)
It is supposed to run cool.The front panels on Mac amps with meters run warm to the touch because of the meter lights.The sinks are cold. .......
67: Re: Repair of Mac 2100 (0.00)
Posted by djk on 2001-10-10, 03:01:43 (206.24.61.173)
Motorola MJ15003 is what they put their house number on.Order them from a US distributor as there are counterfeit ones coming out of Asia. .......
68: Re: DuKane Sectoral Horns (0.00)
Posted by djk on 2001-09-29, 02:24:03 (206.24.61.146)
I bought a bunch of DuKane 5A543 drivers for $10 each that were from an indoor stadium.They are basically a JBL 2410 1" aluminum driver rated at 10W when crossed at 500hz.I also have a single 10 cell .......
69: Hi-Fi and PA (0.00)
Posted by djk on 2001-09-25, 00:54:48 (206.24.61.204)
For hi-fi boxes I use 3/4" industrial grade particle board with 1/4" oak plywood on top.I trim the exposed edges with 5/4 oak.I use either bulkheads or 1 X 3s glued on edge for bracing.I don't like MD .......
70: A Link (0.00)
Posted by djk on 2001-09-21, 03:27:49 (206.24.61.185)
Load the crossover with an 8 ohm 25 watt resistor, see fig 10.Add a 47 ohm 2 watt resistor in series with each tweeter and then parallel as many as you need, see fig 12. I recommend the KSN1016. Two w .......
71: Re: Bryston 4B-ST bridged ? (0.00)
Posted by djk on 2001-09-14, 03:01:56 (206.24.61.142)
A bridged pair of Bryston 4B-ST will be able to swing 160V peak.Into 4 ohm that is 40A, and you say your speakers go lower than that.The gain of the transistors in the Bryston output section start rol .......
72: Re: Do I need a pre-amp for a cassette Deck to bring the swing to 2V? (0.00)
Posted by djk on 2001-09-10, 08:08:03 (206.24.61.191)
775mV is 0 VU on professional tape decks.On consumer cassette tape decks in USA 280mV was usually standard.In Europe 100mV is DIN standard. .......
73: Re: Thanks.. (0.00)
Posted by djk on 2001-09-04, 02:48:44 (206.24.61.164)
I think some profess to like ML gear for reasons they couldn't begin to explain.Kinda like Harley.An old K model sportster would be so cool.But I wouldn't want to take a trip on one.I have three diffe .......
74: Re: GAS Son of Ampzilla Boat Anchor! Enjoy (0.00)
Posted by djk on 2001-09-03, 03:59:00 (206.24.61.147)
So when was this? Bongiorno and Meyer had both published their designs in '71 and '72 (I built them from kits).From the Absolute Sound "Instead, Iverson designed a large Class AB amp which he sold in .......
75: Smokin ? (0.00)
Posted by djk on 2001-09-02, 22:48:53 (206.24.61.147)
It is obvious you don't even have to be smoking something to delude yourself.Unlike the others I have heard (and worked on) an ML-3.An uninspired design that is poorly executed.A massive power supply .......
76: Bridge Amp (0.00)
Posted by djk on 2001-08-25, 01:26:54 (206.24.61.163)
An Adcom GFA1A is a bridge amp.It cannot be used with a speaker selector switch and it will oscillate with long or high capacitance speaker wires.The relay will also trip if there is any DC on the inp .......
77: Out of Gas (0.00)
Posted by djk on 2001-08-24, 03:03:50 (206.24.61.140)
88dB + 24dB = 112dB @ 1M or 102dB @ 10ft.That is peak.Add 3dB for the other speaker.Now subtract 15dB peak to average ratio.That means your stereo will flash those lights at 90dB average level at the .......
78: Audio Conrol (0.00)
Posted by djk on 2001-08-22, 01:06:23 (206.24.61.192)
On the shipping box for my Audio Conrol it says: "Use no hooks.Do not deep fry or saute'." Inside on the circuit board there is a Kilroy.Those guys have been out in the rain too long. .......
79: QSC (0.00)
Posted by djk on 2001-08-15, 00:59:17 (206.24.61.164)
QSC is not hi-fi quality.My old MX2000 was rated at 450 watts.While it played loud it sure didn't sound good.With 2dB of dynamic headroom it would have needed 3.5V drive to reach full output with the .......
80: 4136 (0.00)
Posted by djk on 2001-08-15, 00:31:47 (206.24.61.164)
All the Carver preamps used 4136 op-amps.These were quite bad.None of the Carver preamps,pretuners,or Hologram generators I have seen had regulated supplies.When the TL075 op-amp was still available I .......
81: Bridge (0.00)
Posted by djk on 2001-08-15, 00:15:45 (206.24.61.164)
The Sunfire sub amp is a class AB bridge amp.Theory says it could be 78.5% efficent.It is actually much higher because the B+ is provided by a switching regulator that tracks the audio output voltage. .......
82: Pat Boone ? (0.00)
Posted by djk on 2001-08-14, 01:03:31 (206.24.61.205)
I swear I heard a satanic message on my Pat Boone albums when I played them backwards.It sounded like "drink-k m-more milk-k". .......
83: Impatient ? (0.00)
Posted by djk on 2001-07-22, 01:11:13 (206.24.61.205)
My gosh! You waited 11 hours and 28 minutes! Where were you going to rush out to at 1AM Sunday morning and buy a pre-amp anyway? .......
84: Sloan Valve (0.00)
Posted by djk on 2001-07-21, 23:17:37 (206.24.61.205)
Just remember, it takes a 3/4" water main to operate the Sloan valve for the urinal in the listening room.I'm afraid I'm with Sam.Multi-channel sucks. .......
85: GFA555 (0.00)
Posted by djk on 2001-07-21, 19:06:16 (206.24.61.208)
The GFA555 will drive 900 watts at 4 ohms in bridge mode.With a fan on each heatsink.With the driver transistors changed to MJE15030/15031.The transformer will overheat and then shut off.Stacking two .......
86: Re: Will a Hafler DH500 live driving 3-4 ohms bridged? (0.00)
Posted by djk on 2001-07-21, 03:28:12 (206.24.61.177)
Not a very good amp for subs.Maximum output is 1200W mono into 6 ohms.For about 2 minutes until it shuts off.Sounds mushy.OK for mids and highs.For bass use in PA we use amps that are rated to drive 2 .......
87: B2 (0.00)
Posted by djk on 2001-07-15, 21:25:11 (206.24.61.219)
The only way to repair a B2 when you loose the outputs would be to install Hitachi type enhancement FETs and swap the gate drives.The original Yamaha FETs were like tubes.They were on until you turned .......
88: RTP70N06 (0.00)
Posted by djk on 2001-07-14, 20:36:12 (206.24.61.151)
The RTP70N06 is a switching supply transistor. .......
89: Re: Yamaha B-2x? (0.00)
Posted by djk on 2001-07-14, 20:33:48 (206.24.61.151)
The B2 sounded excellent.Especially with some power supply bypass caps installed.The danger here is that it is non-repairable when it breaks.High voltage complementary pairs of depletion mode mosfets. .......
90: Bad RP Switch (0.00)
Posted by djk on 2001-07-06, 05:35:22 (206.24.61.132)
Bad record play switch.If you take it in to Sony for warranty they will put the same POS part back in.Order an OmronG6A-234P-ST-US-DC12 from www.digikey.com Their part number is Z106-ND $4.68 .I've re .......
91: Re: Electrocompaniet 25 watt amplifier? (0.00)
Posted by djk on 2001-06-29, 08:04:32 (206.24.61.163)
I have a couple of the 25 Electro's.They had a bad batch of transistors.I replaced the series pass regulators for the front end with 2N3440/2N5415 and they work fine. .......
92: 2N3772 (0.00)
Posted by djk on 2001-06-29, 07:54:16 (206.24.61.163)
The quasi-complementary output stage uses two 2N3772 for each channel.The other number is a Dynaco house number for same.The MJ15015,used in the Carver M400T and the Crown Macrotec 600,would be an exc .......
93: I Suggest.... (0.00)
Posted by djk on 2001-06-16, 20:38:07 (206.24.61.191)
That you take the woofer out of the functional speaker and put it in the one that "pops".My guess is that it will "pop" too.Bad woofer inductor in the network.After you resolve this then re-foam both .......
94: Same DAC (0.00)
Posted by djk on 2001-06-09, 05:44:17 (206.24.61.209)
I have an OMS1 in the garage.It has the same DAC as the OMS3 and OMS4.If you upgrade the op-amp and coupling cap it sounds the same. The OMS2 was a POS made for them by Yamaha. .......
95: Thats Funny...... (0.00)
Posted by djk on 2001-06-08, 04:25:50 (206.24.61.197)
Kyocera made the low priced Nakamichi stuff in the mid 80's.Including the OMS3 and OMS4 CD players that sounded so good.The Revox was a Magnavox. .......
96: A Cure (0.00)
Posted by djk on 2001-06-03, 05:38:37 (206.24.61.226)
In the second golden age of hi-fi (70's) we had the same problem. Pinch warp (8hz) and saddle warp (.5hz) combined with RIAA equalization are the culprit. The answer is a steep high-pass filter that d .......
97: Why Not ? (0.00)
Posted by djk on 2001-05-29, 04:32:06 (206.24.61.157)
http://www.sound.au.com/project3a.htm http://www.sound.au.com/project61.htm#top Either of these are quite simple and the circuit boards are available for a reasonable price.Kit of all parts is a .......
98: Oh Yeah ? (0.00)
Posted by djk on 2001-05-26, 19:46:47 (206.24.61.218)
>>and some of the modern Japanese transistors are superior in nearly all respects to many older ones. .......
99: Re: using a tape loop for ext. signal processors such as active crossover, or eq. (0.00)
Posted by djk on 2001-05-20, 13:10:09 (206.24.61.172)
You can't put a crossover in the tape loop.It has to be after the main volume control. .......
100: Re: Clarification (0.00)
Posted by djk on 2001-05-20, 10:35:53 (206.24.61.172)
Yes you can bridge two bridged amps.Wihout extreme care they will probably oscillate at inaudible frequencies.If the stereo amp is stable to 1 ohm then bridged it will be stable to 2 and the bridge br .......
101: Re: Do you get a cape with that name ??? : ) (0.00)
Posted by djk on 2001-05-17, 03:32:14 (206.24.61.226)
Maybe I should change my name to Klystron. .......
102: Parts (0.00)
Posted by djk on 2001-05-15, 03:36:47 (206.24.61.203)
I could use it for parts.Can you put me in touch? .......
103: So Long..... (0.00)
Posted by djk on 2001-05-13, 01:26:48 (206.24.61.188)
and thanks for all the fish. .......
104: Conduction Angle (0.00)
Posted by djk on 2001-05-08, 05:21:49 (206.24.61.153)
The Carver products that have the magnetic field amplifier supply use a triac. It is triggered in the second and fourth quadrants. As the power supply voltage sags, either from turning up the volume o .......
105: Chapter 13 (0.00)
Posted by djk on 2001-05-07, 01:16:18 (206.24.61.210)
Counterpoint went broke. Their hexfet designs all blew up. Adcom had to re-do the 5800 after a few months because of bias problems. The Linear Technology LT1166 is a servo bias IC for hexfets but you .......
106: Re: Vertical MOSFET handle higher current than BJT (0.00)
Posted by djk on 2001-05-05, 22:23:19 (206.24.61.132)
I'm afraid Trevor is right on the money here.The IRF types are not suited for audio.The high current ratings of hexfets are only usable in switching circuits. .......
107: Re: Bryston Vs. FM Acoustics (0.00)
Posted by djk on 2001-05-05, 04:44:23 (206.24.61.161)
Having also done engineering with musicians like John Curl did I understand when he says "fill in".Most musicians don't hear the way audiophiles do.A musician's mind will "fill in" parts barely heard .......
108: Crown MA10K (0.00)
Posted by djk on 2001-05-04, 04:45:16 (206.24.61.148)
The Crown Macrotech 10000 runs on either 208 or 240 three phase.Some people try and run these off of single phase but the filter caps are sized for three phase. .......
109: Re: $4 (0.00)
Posted by djk on 2001-05-02, 03:19:27 (206.24.61.148)
I use cheap surplus caps.98% of the improvement in sound will be there from cheap caps.I put $200 worth of caps in a Levinson a while back.While it sounded a little better than the cheap cap mod I had .......
110: $4 (0.00)
Posted by djk on 2001-05-01, 03:27:24 (206.24.61.136)
For about $4 you can make the Bryston 4B-ST have good bass.On the balanced input boards there is a 470µF cap with a 4.99K resistor in series with it.This needs a .1µF film in parallel with it.On the p .......
111: Motorola (0.00)
Posted by djk on 2001-04-15, 02:44:36 (206.24.61.203)
Most McIntosh used house numbered Motorola 2N5630 output devices.An MJ15003 makes a good replacement.Marantz,Dynaco,and GAS used the same outputs. .......
112: See response in Tweaks (nt) (0.00)
Posted by djk on 2001-04-02, 02:39:39 (206.24.61.223)
. .......
113: Correction (0.00)
Posted by djk on 2001-04-02, 02:00:07 (206.24.61.223)
If it is balanced you could have a polarity switch and still be passive.AFAIK you would have to build it yourself. .......
114: Teflon Wire (0.00)
Posted by djk on 2001-04-02, 01:52:10 (206.24.61.223)
I have some 6ga teflon wire.Forget the connector and hardwire it.This stuff is so stiff you won't even need a stand to put it on. .......
115: Little known facts (0.00)
Posted by djk on 2001-03-18, 23:03:12 (206.24.61.167)
about active balanced inputs.They have very poor RF rejection compared to a transformer balanced input. 1% resistors degrade CMRR to only 40dB.Taking into consideration such variables as wire construc .......
116: Re: Velleman Amplfier Kits (0.00)
Posted by djk on 2001-03-15, 04:00:29 (206.24.61.189)
Audio Amateur reviewed the Velleman MOSFET amp kits a while back.They had parasitic oscillations.Unless you are a tech with a 100Mhz scope and know how to deal with such problems I would pass.The tube .......
117: Very Scarry (0.00)
Posted by djk on 2001-03-04, 03:24:10 (206.24.61.138)
But when they work they sound very good.When you need service many of the key parts will be unavailable.I would buy them from you as spare parts.If you want to hook them up I suggest you use a 1 1/2 a .......
118: Ratings (0.00)
Posted by djk on 2001-02-27, 05:06:51 (206.24.61.168)
The CA600 was made from 1974~1978 and was 30 watts RMS per channel at 8 ohms.The CA610 II was 45 watts RMS per channel at 8 ohms.CA800 45 watts, CA810 65 watts, CA1000 70 watts, CA1010 90 watts.The CA .......
119: $40 worth of floor sweepings.... (0.00)
Posted by djk on 2001-02-27, 04:43:14 (206.24.61.168)
....in a nice wooden box. .......
120: Apt pre (0.00)
Posted by djk on 2001-02-18, 06:20:39 (206.24.61.133)
That pre is full of TL072s and un-bypassed electrolitics in the signal path.Dump the 072s for BB OPA2604s and buy a bag of .1µF polyprop and go to it. .......
121: Re: enclosers for gauss for 2 #5842 2 #4583-A (0.00)
Posted by djk on 2001-02-11, 20:10:40 (206.24.61.205)
The 4583A will work well in 4 cu ft net with two ports 4" dia by 6.5" long.This will be tuned to 40hz.If both drivers are to go in one box then it should be 8 cu ft net with four ports 4" in dia by 5. .......
122: 700VA (0.00)
Posted by djk on 2001-02-09, 17:08:54 (206.24.61.187)
The transformer is a mighty 700VA.My McIntosh MC2120 has a 600VA transformer and is ony rated at 120 watts at 4 ohms.The Adcom GFA555 is rated at 325 watts at 4 ohms.I guess that is why the Mac has mu .......
123: Urban Legend (0.00)
Posted by djk on 2001-02-09, 04:21:45 (206.24.61.213)
McIntosh amps were sold with no warranty.They came with an application for a free service contract.The duration of this service contract was usually five years.If the unit was not sold by an authorize .......
124: Use the rec out jacks (nt) (0.00)
Posted by djk on 2001-01-13, 20:09:53 (206.24.61.146)
. .......
125: Re: Classic Tandberg TR 2025 -- Any good? (0.00)
Posted by djk on 2001-01-08, 00:41:26 (206.24.61.187)
The TR 2040 on Klipschorns was easily the best sounding receiver I have ever heard.The TR 2075 had a great pre-amp and tuner but the power amp sounded thin.In 1980 I sold (in no particular order) Naka .......
126: Of Course ! (nt) (0.00)
Posted by djk on 2000-12-30, 15:49:47 (206.24.61.162)
. .......
127: Re: Motorola (0.00)
Posted by djk on 2000-12-30, 02:57:07 (206.24.61.151)
The Russell Hamm article referenced by Jon Risch would be a good place to start.The Motorola Bipolar Power transistor data book has the test circuit and graphs under the MJ21193/21194 pages.Data sheet .......
128: Bloated ? (0.00)
Posted by djk on 2000-12-29, 18:36:23 (206.24.61.216)
The early Marantz designs like the 2220B and the 1060 had capacitor coupled output sages.The SX780 was direct coupled.A cap coupled output stage has much more THD particularly when clipped.This is bec .......
129: Motorola (0.00)
Posted by djk on 2000-12-29, 18:14:15 (206.24.61.216)
MJ21193/21194 high power audio output transistors can exhibit .08% THD in class B with no feedback.This is at 100 watts at 8 ohms with the hfe matched at 50V/5A.With no matching the distortion could b .......
130: Uhhhh ! (0.00)
Posted by djk on 2000-12-28, 22:36:30 (206.24.61.156)
Your mother wears army boots!!! .......
131: Wire is a four letter word ! (0.00)
Posted by djk on 2000-12-16, 12:38:42 (206.24.61.200)
It is safer to discuss politics and religion. .......
132: Re: Yup. (0.00)
Posted by djk on 2000-12-16, 12:33:18 (206.24.61.200)
It was about 15 years later and in Audio Amateur and was about the model 210 (Tigersaurus) not the 207 (Tiger .01).I have schematics and most of the original magazine articles if anyone needs help. : .......
133: Not to be a pedant (0.00)
Posted by djk on 2000-12-16, 12:26:33 (206.24.61.200)
But it was Daniel Meyer in the December 1972 issue of Radio Electronics that had the Tiger .01 article.The original Tigers That Roar was in Popular Electronics but it was in 1969. .......
134: Re: Yup. (0.00)
Posted by djk on 2000-12-16, 04:18:24 (206.24.61.225)
The schematic is virtually the same as an old Bryston 2B.The original driver transistors are hard to find.I have four of the 60 watt mono one of the 25 watt stereo and two of the 250 watt mono.And thr .......
135: Re: Extreme sensitivity to loud sounds... cause? please help.... (0.00)
Posted by djk on 2000-12-12, 23:52:45 (152.163.204.52)
She probably has severe hearing loss and should be tested.Gun shops sell hearing protectors that pass low level sounds relatively unaltered but still protect against loud sounds.A friend has an almost .......
136: Oh really ? (0.00)
Posted by djk on 2000-12-06, 01:20:32 (4.48.62.120)
"The circuit is very simple and any competent tech can repair for you" If he could find out what is in those potted modules.And make new ones.I have done it and it is not simple or easy. .......
137: solid state or hybrid designs incorprating Common Emitter output transistor topology? (0.00)
Posted by djk on 2000-11-28, 02:00:53 (4.48.62.62)
Nelson Pass designed a series of receivers for Nakamichi in the mid 80's that were not only common emitter but also had no global negative feedback.The 100 watt unit was $1000 and sounded quite good. .......
138: commercial offerings which use common-emitter output stages. (0.00)
Posted by djk on 2000-11-28, 01:54:09 (4.48.62.62)
A partial list.Marantz 250,500.Bryston 2,3,4B prior to 1987.My father's HK 730 receiver,1976. .......
139: High BFD Factor (0.00)
Posted by djk on 2000-11-28, 00:41:00 (4.4.181.187)
Fluff site.No content.No pictures of kit.No specifications.No schematics.No sale. .......
140: Boat anchor ! (0.00)
Posted by djk on 2000-11-24, 19:42:44 (4.4.181.129)
Have one in my garage system.When the tone control turnover switches go bad you're screwed.A Hafler DH220 blows it away. .......
141: Re: Spares for Tandberg receiver (0.00)
Posted by djk on 2000-11-24, 19:37:55 (4.4.181.129)
Most of the semiconductors are off the shelf Motorola.You shouldn't have any problems finding them. .......
142: Sony is a four letter word ! (0.00)
Posted by djk on 2000-11-23, 03:03:25 (4.48.62.62)
Any Sony gear from the mid to late 80's.CDP 302's had a 50% failure rate.D5 and D7's were 100%.The 550 and 750 receivers were 100%.All the tape decks were 100% after 3 years.SONY = G_ood A_udio R_uine .......
143: Hello Again.... (0.00)
Posted by djk on 2000-10-25, 21:45:23 (4.4.129.30)
The SSM2220/2210 while matched pairs were NOT a complimentary match.The beta on the NPN was much higher than the beta on the PNP.The highly acclaimed Boulder amps use the National Semiconductor LM 394 .......
144: Dolby Pro Logic (0.00)
Posted by djk on 2000-10-25, 21:12:46 (4.4.129.30)
Poor man's version(this only works on a normal stereo amp):Three identical front speakers required,two identical rears.Wire the left positive speaker lead to the left positive amp output.Wire the righ .......
145: Send me an E-mail (0.00)
Posted by djk on 2000-10-25, 20:49:20 (4.4.129.30)
And I will give you my mailing address.For a SASE I will draw you the schematic for what you need.I have no way to post it. .......
146: You need to ... (0.00)
Posted by djk on 2000-10-12, 01:16:27 (4.16.42.98)
Sell it all and get the Bose Wave Radio! .......
147: Do It ! (0.00)
Posted by djk on 2000-10-08, 23:14:07 (4.4.181.158)
The heatsink modules are identical.Do it.If you want to freshen it up a bit so it doesn't blow up switch to MJ15003 outputs and MJE15030/031 driver transistors.Better linearity plus higher current and .......
148: Love/Hate (0.00)
Posted by djk on 2000-10-08, 22:40:10 (4.4.181.158)
I have always had a love/hate thing for tubes.Love the midrange and hate everything else.The first time I heard a zero negative feedback design,Threshold mid 80's,I was stunned.The only things I could .......
149: I 2nd John's remarks (0.00)
Posted by djk on 2000-10-07, 01:45:50 (205.175.225.22)
And suggest you buy a used Altec 9440 from Ebay.Will destroy any Adcom or Bryston for low end.Better than the newer PA amps.Customize a Marchand XM48 for 24dB and the gain you need for a passive volum .......
150: Two Available (0.00)
Posted by djk on 2000-09-09, 15:30:51 (4.16.42.100)
I repaired one of these for a friend and was stunned by how good it sounded on Klipschorns.Subsequently I bought two non working units from Audio Classics.One channel as supposed to be out on each amp .......
151: Re: Please Help! (0.00)
Posted by djk on 2000-09-02, 19:01:26 (4.16.42.74)
You may swap the tubes.Number them so you don't get confused.When it doesn't do anything put them back in their original locations.Swapping output tubes generally requires changes to the bias and or b .......
152: Re: SSM2210 and 2220, transistor pair (0.00)
Posted by djk on 2000-08-27, 21:09:48 (4.16.42.65)
Can't help with the transistors but the wood is called lumbercore in the USA.+++++The material is "lamellträ" in swedish, sticks of wood inside and then thin plywood at both sides. Can anyone tell me .......
153: Re: What is a tiered power supply? (0.00)
Posted by djk on 2000-08-10, 17:51:41 (205.175.225.5)
A regular amp has one main rail,say +/- 75v for a 200 watt amp.A Carver M400 "cube" has three rails or tiers,+/- 25v,+/- 50v,+/- 80v.A PM2.0 has four rails.Most Crest amps have two rails. ::: TOPIC:: .......
154: Re: What is a class G amp? (0.00)
Posted by djk on 2000-08-07, 17:57:04 (205.175.225.22)
Class G and H have tiered power supplies. .......
155: DIY Repair (0.00)
Posted by djk on 2000-07-24, 17:56:36 (205.175.225.22)
The cap in the feedback loop to ground is damaged.Replace it. .......
156: Re: Nakamichi (0.00)
Posted by djk on 2000-07-22, 20:35:25 (4.4.181.130)
The PA-7 while it looked cool was unreliable and thin sounding.The PA-5 was reliable but sounded poor. The CA-5 sounded thin too.The CA-5II was much better.The CA-7 was great.The OMS-4 sounded much be .......
157: Re: FM Tuner Problems in Advent 300 (0.00)
Posted by djk on 2000-06-09, 23:12:17 (205.175.225.5)
The tuner output coupling caps are dried up.Replace them. .......
Found 200 records in Amp/Preamp Asylum.
1: RE: TA2024 chip amp on 13.8V psu? (0.00)
Posted by djk on 2018-01-10, 16:35:20 (199.188.65.49)
They work fine at 13.8V, and the bigger the suppy current rating, the better. Each individual channel is limited at 7A, so if driving dual 4Ω loads a 10A supply is not out-of-line. A friend accid .......
2: Cosmetics? (0.00)
Posted by djk on 2017-11-01, 15:29:26 (199.188.65.49)
The cosmetics look like they were done by someone that also does those horrid looking little cars I see everywhere. .......
3: RE: motorized volume control (0.00)
Posted by djk on 2017-10-29, 14:28:37 (207.191.195.70)
. .......
4: RE: Interesting post from diyaudio.... (0.00)
Posted by djk on 2017-09-30, 13:00:15 (199.188.65.49)
Yes, the Carver M1.0T doesn't sound grainy or muddy! Fine, if that's what you like (it's not my cup of tea). .......
5: RE: Amplifier Input Topology (0.00)
Posted by djk on 2017-07-07, 13:06:46 (199.188.65.49)
A bi-polar clamp at ±5V is need on the output of the preamp to prevent degrading the diff pairs noise figure when they avalanche at about 7V. .......
6: RE: Tuner alignment in the MX117 from (0.00)
Posted by djk on 2017-07-06, 14:35:37 (199.188.65.49)
Tuners don't hold alignment well during shipping, and all the incandescent lamps will break. .......
7: +1 (0.00)
Posted by djk on 2017-07-05, 14:49:25 (199.188.65.49)
"If it's custom I know a few guys that say it's a years waiting list. And don't bother me or it will be longer." +1 .......
8: 100mV (0.00)
Posted by djk on 2017-03-17, 13:54:30 (199.188.65.49)
There is no DC adjust. If the DC exceeded 100mV I would consider replacing the diff input pair for that channel. .......
9: RE: Replace the PSU's SS diodes with Low-noise (0.00)
Posted by djk on 2017-03-14, 15:51:12 (199.188.65.49)
Did you even look at the schematic? I think not. "Re-check and re-set the DC and AC balance" There is no DC (or AC) balance control, it has a DC servo. "replacing, any and all electrolytic signal caps .......
10: (on the cord) (0.00)
Posted by djk on 2017-01-05, 13:43:15 (199.188.65.49)
It's in the IEC plug (on the cord). UK USERS PLEASE READ THIS IMPORTANT SAFETY INFORMAT ION Fuse replacement This appliance is fitted with a non-rewireable 13 A mp mains plug. The plug contains a 5 Am .......
11: RE: Linn Classik K dead. Where are the fuses? (0.00)
Posted by djk on 2017-01-04, 17:31:10 (199.188.65.49)
Under the power inlet. .......
12: RE: Does Anyone Have Schematics for the Barry Streets 850/950 Amplifier (0.00)
Posted by djk on 2016-12-10, 14:46:02 (199.188.65.49)
The schematic published showed a choke input filter for the main amplifier. .......
13: BJT (0.00)
Posted by djk on 2016-12-09, 13:53:33 (199.188.65.49)
The Citation 12 uses a pair of NPN BJT devices, not FETs. It runs on about ±40V. .......
14: RE: Does Anyone Have Schematics for the Barry Streets 850/950 Amplifier (0.00)
Posted by djk on 2016-12-08, 16:39:44 (199.188.65.49)
It was just a Leach with current source diodes feeding the dual diff pairs, and a choke input power supply. The schematic was in an old issue of Audio Magazine. .......
15: not to hurt you (0.00)
Posted by djk on 2016-11-01, 15:46:47 (199.188.65.49)
It's there to induce audible hum to allow you to polarize the cord properly. The value is sized to be large enough to induce the hum, but small enough not to hurt you. Polarized plugs seem like a good .......
16: Tale of Woe....... (0.00)
Posted by djk on 2016-10-24, 15:04:39 (199.188.65.49)
Years ago I had a similar problem in my service department, strange popping noises from an HK product in phono mode. The problem was poor power supply rejection in the HK. Noting I could do fixed it. .......
17: Audio Research (0.00)
Posted by djk on 2016-10-12, 15:51:29 (199.188.65.49)
Years ago I had a customer that traded in a top-of-the-line Audio Research amplifier (solid state) in a sealed box. It had blown up several times while driving some wicked cables. Audio Research final .......
18: OK (0.00)
Posted by djk on 2016-10-11, 15:54:46 (199.188.65.49)
It's fine to run a 50hz transformer on 60hz (but not to run a 60hz transformer on 50hz). .......
19: Brain Fog ? (0.00)
Posted by djk on 2016-08-31, 14:59:07 (199.188.65.49)
"Stupid low carb diet has my brain in a fog. " Takes a while to clear up. If you try adding a bit of coconut oil to your diet every 8hrs~10hrs you won't have the problem. Coconut milk if you drink hot .......
20: Speaker Relay ? (0.00)
Posted by djk on 2016-08-18, 15:14:11 (199.188.65.49)
If cleaning all the pots and contacts it still has the problem, check the speaker relay. .......
21: Distortion (0.00)
Posted by djk on 2016-05-09, 13:29:55 (205.175.226.102)
Some tape decks cause distortion in the source unit when they are turned off, a buffer stops this. .......
22: Capacitors and FETs (0.00)
Posted by djk on 2016-04-28, 16:14:09 (199.188.65.49)
All of those will sound OK after all the electrolytics have been replaced. If the B2 breaks, none of the FETs are available. .......
23: RE: Caution. (0.00)
Posted by djk on 2016-03-25, 14:09:13 (199.188.65.49)
They have trouble with any load lower than 8Ω. Even the best modern ON Semiconductor outputs can't swing enough current for lower impedance loads. Bongiorno recommended using the MJ2119x series output .......
24: RE: Denon Pra 1000 (0.00)
Posted by djk on 2016-02-01, 21:25:47 (205.175.226.97)
It may be a tape monitor switch, or a dirty muting relay. .......
25: RE: Some of us remember (0.00)
Posted by djk on 2016-01-28, 22:40:53 (205.175.226.96)
The Infinity was class D, not digital. .......
26: RE: Amp Ticking (0.00)
Posted by djk on 2015-12-11, 13:55:23 (205.175.226.100)
A technician could take it apart and find out. I would not use it in the meantime. (I used to be a service center for McIntosh, and still own two MC2120) .......
27: RE: Static from right channel Adcom GFA-555ii (0.00)
Posted by djk on 2015-12-08, 18:16:52 (205.175.226.101)
Buy a can of freeze-mist and spray the small plastic transistors after it starts making noise. .......
28: RE: Fuse? (0.00)
Posted by djk on 2015-10-17, 21:43:05 (205.175.226.96)
"Both channels on the tape output work as expected" Of course, that's why I said what I did. If you can't afford the amp I showed, there are smaller versions starting at less than $30 of so. ::: TOPIC .......
29: RE: Dayton (0.00)
Posted by djk on 2015-10-16, 00:12:43 (205.175.226.102)
That's the one I had in mind. There may be some other choices. http://i.ebayimg.com/00/s/NjM3WDgwMA==/z/-iIAAOSwrklVSYVh/$_12.JPG?set_id=880000500F .......
30: RE: Not my experience (0.00)
Posted by djk on 2015-10-15, 23:18:26 (205.175.226.102)
You like the sound of those 4558 opamps, and those horrible caps? Go figure. .......
31: Bridge Amp (0.00)
Posted by djk on 2015-10-15, 18:19:49 (205.175.226.102)
"I wonder if it is really a 20-watt per channel amplifier. " It's 20W at 10%THD into 4R. Its a bridge amp, so it can swing 24V peak-to-peak. You really need a 13.8V 7A supply, not the cheap thing they .......
32: Dayton (0.00)
Posted by djk on 2015-10-15, 15:37:19 (205.175.226.96)
The sound quality of the Lepai is no where near that of the Dayton in the hump-back plastic case. .......
33: Fuse? (0.00)
Posted by djk on 2015-10-12, 14:37:32 (205.175.226.96)
Open it up to see if you just blew a fuse, otherwise buy an amp with a volume control and hook it up to the tape outputs. .......
34: Power Switch ? (0.00)
Posted by djk on 2015-10-01, 16:40:07 (205.175.226.100)
"maybe the original part is not available but there are a lot of high quality controls that surpass the stock McIntosh control...." But will not have a power switch. McIntosh selected their controls b .......
35: RE: It was 1978 ... (0.00)
Posted by djk on 2015-09-14, 18:21:39 (205.175.226.100)
I blew one up in 1979 or so, they cannot be hooked up to a common-ground speaker switcher! .......
36: RE: Small Electrolytics (0.00)
Posted by djk on 2015-09-04, 13:48:02 (205.175.226.96)
It all depends on the costy of labor, the parts cost is tiny. Can you solder? Are you willing to learn? If no to both you will be shopping. .......
37: Small Electrolytics (0.00)
Posted by djk on 2015-09-03, 22:40:19 (205.175.226.102)
There are a handful of small electrolytics I would replace, even before the main filter caps (which is all that has been mentioned here). .......
38: Caps (0.00)
Posted by djk on 2015-08-15, 19:47:52 (205.175.226.102)
Updating a McIntosh with about $4 worth of caps will really make it sing! Better HF detail and imaging, tighter bass. I have a list if anyone is interested. .......
39: (not me) (0.00)
Posted by djk on 2015-08-15, 19:40:57 (205.175.226.102)
Hmmmmmmmmmmm, Will need to have all the electrolytics replaced, needs baked to drive out the moisture from the carbon composition resistors, the switches may be too oxidized to clean up, will probabl .......
40: RE: Tape out/ pre out (0.00)
Posted by djk on 2015-08-13, 18:08:36 (205.175.226.102)
No, there would be about 20dB less gain available than pre-out, and no volume control. .......
41: RE: B&K ST-140 Pair - Re-Cap or Buy New? (0.00)
Posted by djk on 2015-08-09, 19:40:52 (205.175.226.102)
Replace with any good new cap, Panasonic, Nichicon, Elna, etc.(DIgiKey, Mouser, etc.). The main filters should be the same voltage (or a bit higher)and fit the clamps, they can be a bigger µF. Conside .......
42: Friend ? (0.00)
Posted by djk on 2015-08-08, 21:43:32 (205.175.226.102)
"So- do I send the B&K's out for new caps/mods" Find a friend that can solder, this is not a difficult job, and the parts are inexpensive. .......
43: RE: Yes (0.00)
Posted by djk on 2015-07-31, 22:39:48 (205.175.226.102)
You misunderstand the nature of these ads, they are not the ones in the sidebar, they are the ones hot-linked in the text of our replies, and are not related to our interests in any way,shape,or form. .......
44: I see all that garbage too (0.00)
Posted by djk on 2015-07-30, 23:00:54 (205.175.226.102)
I see all that garbage too. Anyone know how to get rid of it? .......
45: RE: Mc preamp (0.00)
Posted by djk on 2015-07-11, 19:58:36 (205.175.226.99)
You think that is witty? You may be half right. Google pinch and saddle warp. .......
46: RE: Mc preamp (0.00)
Posted by djk on 2015-07-11, 00:06:04 (205.175.226.102)
Does it have an infrasonic filter? .......
47: RE: How can a phono preamp be both passive and active? (0.00)
Posted by djk on 2015-07-08, 18:01:09 (205.175.226.98)
It may be a high gain phono with no line stage. .......
48: RE: What is the best bang for your buck amplifier and its price? (0.00)
Posted by djk on 2015-06-22, 18:11:45 (205.175.226.33)
$1185 + shipping WIRED with ALL tubes & EL34 output tubes .......
49: RE: complete amps that use IRS2092 chips?... (0.00)
Posted by djk on 2015-04-24, 18:30:28 (205.175.226.37)
"Looking for something cheap without a fan." Define cheap. Heatsinks are heavy, cost money, no fan, no deal. Behringer, Peavey, Crest. Crest sounds the best (compared with Behringer, not Peavey). Here .......
50: RE: Nope. Didn't sound bright and Its been used with very unforgiving speakers, (0.00)
Posted by djk on 2015-04-05, 22:56:50 (205.175.226.39)
We sold the Maggies with the ribbons (3.5?), Klipsch, etc. Was using the excellent Nakamichi OMS-4 CD player as the source. I don't remember the magazine that labled the Forte as 'bright'. They also m .......
51: RE: Even before the upgrade, it was about as neutral a preamp as I've ever owned. (0.00)
Posted by djk on 2015-04-03, 18:18:21 (205.175.226.33)
Magazine reviewers said 'bright', the one I had was 'bright' (traded for a Nakamichi CA5II). Something must be wrong in YOUR system. .......
52: Bright ? (0.00)
Posted by djk on 2015-04-02, 15:00:50 (205.175.226.37)
Bright? Anorexic, thin, etc. .......
53: RE: I connected a source to the tape-out once (0.00)
Posted by djk on 2015-03-29, 01:45:39 (205.175.226.34)
Been there seen that. (former service manager for a hi-fi shop) .......
54: Didn't even bother ? (0.00)
Posted by djk on 2015-03-27, 23:56:50 (205.175.226.37)
Didn't even bother to read the description? 2 Channel 250Watt Class D Audio Amplifier Board - IRS2092 250W Stereo Power hifi It is the IR Aud7 design with the 2092 chip. .......
55: RE: 250W IR Class D amp - with Mudorf M-Lytic Caps (0.00)
Posted by djk on 2015-03-27, 18:17:47 (205.175.226.37)
Check this out too: .......
56: RE: ESS 500M amplifier - Keep it? (0.00)
Posted by djk on 2015-03-25, 23:34:45 (205.175.226.33)
I have the original ESS 500, circa 1974. It sounded better in the mids and highs than the Crown DC300A, Harman Kardon Citation 16, etc.(I was a dealer for those, and more) It's a very simple design, a .......
57: RE: ID and Opinions on this Ampzilla (0.00)
Posted by djk on 2015-03-25, 15:31:01 (205.175.226.33)
5% carbon film resistors have copperweld leads (as do m any small film caps). The copper striker coat on the steel lead fails and the part goes open, or intermittent. The quality of the tin end-spray .......
58: ebay (0.00)
Posted by djk on 2015-03-24, 23:55:20 (205.175.226.33)
. .......
59: RE: ID and Opinions on this Ampzilla (0.00)
Posted by djk on 2015-03-24, 23:43:37 (205.175.226.33)
That's waht I would call an Ampzilla I, the II had peak lights. Neither will drive 4R. Due to the age any of them will need to be completely rebuilt, even the resistors stripped off the boards and rep .......
60: RE: Amp Camp Amp (ACA) PSU... (0.00)
Posted by djk on 2015-03-24, 00:24:40 (205.175.226.39)
The ACA PSU was just a pair of 19V laptop power supplies (really). http://www.ebay.com/itm/19V-3-42A-Laptop-Charger-AC-Adapter-Power-Supply-for-ACER-Aspire-GATEWAY-ASUS-DX-/261810619381?pt=LH_DefaultD .......
61: RE: Need more tape outputs. (0.00)
Posted by djk on 2015-03-23, 23:50:14 (205.175.226.39)
A device that is not powered will cause distortion unless you have a buffered output for each output. Do you need outputs? Or just inputs? You could use an input selector in reverse which will avoid t .......
62: ESP (0.00)
Posted by djk on 2015-03-21, 20:28:29 (205.175.226.19)
Hey, I like ESP, but every now and then he does say something stupid. Try not to throw out the baby with the bath water though, he does have some good info on his site. I guess the problem with it is .......
63: The excellent is new forever. (0.00)
Posted by djk on 2015-03-18, 23:03:55 (205.175.226.38)
Emerson .......
64: RE: Can recommend websites that explain classes of amplifer in the most simplified way? (0.00)
Posted by djk on 2015-03-18, 01:05:34 (205.175.226.34)
Start about 2/3rds of the way down. .......
65: RE: can spike from valve pre damage pow amp (0.00)
Posted by djk on 2015-03-15, 23:27:55 (205.175.226.34)
If the reverse Base-Emitter junction on the Diff input pair is exceeded (about 7V) there will be permanent damage (it will be noisey). .......
66: RE: Bypassing gain controll Class D Audio SDS (0.00)
Posted by djk on 2015-03-14, 19:30:33 (205.175.226.34)
Get us the schematic and we can figure it out. It looks pretty straight-forward. .......
67: RE: Going to try a dirt cheap passive preamp. (0.00)
Posted by djk on 2015-03-08, 19:50:50 (205.175.226.32)
Too bad they didn't allow enough space to upgrade the schiity quality volume control. .......
68: RE: Hafler Amps (0.00)
Posted by djk on 2015-03-06, 22:58:48 (205.175.226.33)
Null test? Don't you mean the XL280? .......
69: RE: "ROBUSTO" 500W Sure Class D (0.00)
Posted by djk on 2015-02-15, 19:40:22 (205.175.226.32)
"You MIGHT have better luck at a college or university where electrical or electronic engineering is taught? " Thanks for the ideas, I'll give them a try. I know a recently retired EE prof, he might g .......
70: RE: "ROBUSTO" 500W Sure Class D (0.00)
Posted by djk on 2015-02-15, 00:17:27 (205.175.226.38)
I don't want a patent, I have had problems related to patents in the past. I was looking for someone that had the skill to develop it, and then see where it goes. I don't have the time, or energy, to .......
71: RE: "ROBUSTO" 500W Sure Class D (0.00)
Posted by djk on 2015-02-14, 20:31:43 (205.175.226.38)
I read that years ago. It defines the problems, but does not offer solutions. I have a method that self-adjusts dead time, even with variable loading and drive, and over temperature too. .......
72: RE: "ROBUSTO" 500W Sure Class D (0.00)
Posted by djk on 2015-02-13, 01:01:48 (205.175.226.37)
Do you know someone that could exploit an idea for a better class D amplifier? Dead-time is critical, too little and the amp gets hot (from cross-conduction), too much and the sound quality suffers. I .......
73: RE: "ROBUSTO" 500W Sure Class D (0.00)
Posted by djk on 2015-02-13, 00:34:06 (205.175.226.37)
Under $40 assembled and delivered, based on the International Rectifier Aud7 design with the IRS2092 (used by Behringer, Peavey, Crest, etc.), will run on up to ±80V, max current is 17A RMS. Another o .......
74: What? (0.00)
Posted by djk on 2015-02-06, 18:12:07 (205.175.226.34)
What is that? It looks like a newer Andromeda. .......
75: RE: Class A formula (0.00)
Posted by djk on 2015-01-19, 23:29:30 (205.175.226.33)
"idle current need be only one half the peak output current, " So, 70mA idle will support 140Ma Peak, or 100mA RMS. W=(I^2)R, so it would be 80mW into 8Ω, half that at 4Ω. .......
76: RE: That's Latin (0.00)
Posted by djk on 2014-12-23, 15:19:31 (205.175.226.37)
Classical Latin would be excursio, a running out or forth. .......
77: 86dB ? (0.00)
Posted by djk on 2014-12-22, 23:45:15 (205.175.226.33)
Specification Description/Format 2-way vented-box / Stand mount Drive Units 1 x 1" (25mm) High frequency textile dome 1 x 5" (125mm) Woven Kevlar bass cone Frequency Response (±3dB ) 44Hz - 24kHz Sens .......
78: RE: Kenwood repair (0.00)
Posted by djk on 2014-12-12, 23:07:07 (205.175.226.39)
It's not rational to buy another 35 year old amplifier, just replace the caps in yours. .......
79: Capacitors (0.00)
Posted by djk on 2014-12-12, 15:01:59 (205.175.226.38)
Probably needs the electrolytics replaced, that's all. A DIY job if you can solder. .......
80: RE: Assuming there *is* a feedback pole (0.00)
Posted by djk on 2014-12-10, 18:17:45 (205.175.226.19)
"Actually, I find that preamps with active EQ can exacerbate ticks and pops. " Yes indeed. Without the feedback the music is in a different plane than the junk and the junk is easily ignored. ::: TOPI .......
81: RE: Assuming there *is* a feedback pole (0.00)
Posted by djk on 2014-12-10, 14:49:28 (205.175.226.19)
Passive RIAA in a preamp is an excellent idea. The music just shines through the ticks and pops that otherwise cause strange behavior in the preamp. It's like the junk is in a different plane from the .......
82: RE: Not (0.00)
Posted by djk on 2014-12-09, 23:24:49 (205.175.226.38)
The input pole should predominate, followed by the feedback pole, then followed by the supply pole (as a function of the load impedance). Staggering the poles in this fashion makes the amplifier behav .......
83: RE: Tubes ? (0.00)
Posted by djk on 2014-11-24, 23:46:12 (205.175.226.34)
They just wanted a loud set of monitors. .......
84: Tubes ? (0.00)
Posted by djk on 2014-11-18, 18:06:58 (205.175.226.34)
None in the MC2300. .......
85: RE: Voltage amp IC replacement for Mitsubishi DA-R35 receiver (0.00)
Posted by djk on 2014-11-10, 15:49:25 (205.175.226.14)
. .......
86: Caps (0.00)
Posted by djk on 2014-10-07, 15:16:49 (205.175.226.14)
If you replace it and still have a problem you have leaky bypass caps on the 5V line. .......
87: 30hz (0.00)
Posted by djk on 2014-08-27, 23:14:41 (205.175.225.12)
A 2 cu ft 2nd order sealed box with an F3 of 30hz can only be 0.18% efficient (84.55dB). A 2 cu ft 4th order vented box with an F3 of 30hz can only be 0.36% efficient (87.56dB). A 2 cu ft 6th order ve .......
88: Class AB (0.00)
Posted by djk on 2014-08-25, 23:38:01 (205.175.225.12)
The SAE MK XXXI is class AB. There are several electrolytics in the signal path. Replace with fresh and add a film bypass cap if you want to hear what they can really do. .......
89: LMAO (0.00)
Posted by djk on 2014-08-25, 23:33:35 (205.175.225.12)
Really? This will put you on the floor with one watt. As will this And this I also have built several sets of a dual 12 based tower that are down around 100dB/W that will do the same in a fra .......
90: DCR (0.00)
Posted by djk on 2014-06-27, 22:46:04 (205.175.225.23)
Damping factor is a red herring, unless it is lower than about 20. If it is really low it affects the Qes of the driver, raising the Qts, which controls the box size. Those touting very high damping f .......
91: RE: Yamaha a-s3000 Integrated Amp (0.00)
Posted by djk on 2014-06-12, 23:23:20 (205.175.225.22)
The reviewer is not a responsible one if he does not even attempt to get it replaced. Yamaha is a very responsible company and deserves better than this guy. .......
92: RE: Possible upgrade of a tube amp (0.00)
Posted by djk on 2014-03-31, 16:05:13 (205.175.225.23)
Good to know, thanks. .......
93: RE: Possible upgrade of a tube amp (0.00)
Posted by djk on 2014-03-28, 21:05:36 (205.175.225.12)
These look interesting, .......
94: PEC (0.00)
Posted by djk on 2014-03-27, 19:51:11 (205.175.225.23)
You also might want to look at the PEC pots recommended by Nelson Pass. He used two to avoid tracking issues, they are about $9 each (Digi-Key). .......
95: RE: 600Ω (0.00)
Posted by djk on 2014-03-25, 14:47:52 (205.175.225.12)
Perhaps you should investigate transformer volume controls, or using a 6dB step-up transformer with a single series resistor volume control with a variable parallel ladder (fewer switch contacts and r .......
96: 600Ω (0.00)
Posted by djk on 2014-03-24, 17:05:25 (205.175.225.12)
While they may be rated to drive 600Ω, I would wager the dyamics may be a bit compressed. I used to build PLLX-overs that were about 2KΩ, most preamps sounded compressed driving them. The pe .......
97: Pyramid PS9KX 5A/7A (0.00)
Posted by djk on 2014-03-05, 14:47:25 (205.175.225.22)
About $35 (free shipping) from Amazon. The 7A peak rating means it can supply full output into two 4Ω loads. I've used the 50A Pyramid, it's OK. .......
98: +1 (nt) (0.00)
Posted by djk on 2014-03-03, 23:29:08 (205.175.225.12)
. .......
99: RE: Lepai (0.00)
Posted by djk on 2014-03-03, 23:27:31 (205.175.225.12)
That amp has some really low quality opamps and capacitors in it, it will really sound good if you upgrade them. .......
100: Edcor (0.00)
Posted by djk on 2014-02-14, 16:49:17 (205.175.225.23)
These inexpensive Edcor transformers are great (for the money). .......
101: I agree (0.00)
Posted by djk on 2014-02-14, 14:12:03 (205.175.225.12)
Too much gain (16dB), too low of an impedance. .......
102: 16dB (0.00)
Posted by djk on 2014-02-14, 14:08:44 (205.175.225.12)
That's 16dB of gain. Most CD players are Red Book standard, so 0dB is 2V. 6dB of gain would be 4V out to the amplifier. 16dB seems excessive, and may load the CD player down enough to impact the dyn .......
103: Why....... (0.00)
Posted by djk on 2014-02-13, 20:37:14 (205.175.225.23)
Why are you using a 600:25K transformer for gain, it's way higher than you need. A 600:2.4K will give 6dB of gain, usually enough to drive any amplifier from a CD player. .......
104: Tape Out (0.00)
Posted by djk on 2014-02-11, 22:52:04 (205.175.225.22)
Just hook the tape out of the pre with the phono section to a line input on your newer pre. The tape out bypasses most of the garbage; tone controls, volume controls, selector switch, line stage. ::: .......
105: RE: Cranky Yamaha A-520 (0.00)
Posted by djk on 2014-02-05, 14:01:49 (205.175.225.23)
Sounds like it may be a relay issue. Did you remove the relay covers and clean the contacts first time around? Did you use Caig DeOxit? .......
106: $4 (0.00)
Posted by djk on 2014-01-16, 15:50:19 (205.175.225.12)
"Their product sounds too mushy for my taste" I agree, but it only takes about $4 worth of bypass caps to make this amp come alive. .......
107: Paint ? (0.00)
Posted by djk on 2014-01-13, 20:21:15 (205.175.225.22)
The seller should have shot a coat of paint on it before asking that much money for it. .......
108: RE: Beer-can sized filter caps are not needed (0.00)
Posted by djk on 2013-12-13, 17:36:53 (205.175.225.23)
"But this of the caps sizing i think it is a very important issue." Which is why I referenced the Nelson Pass article, and gave you some real life examples. .......
109: RE: Ok, i have to look at the full picture but how do you explain this ? (0.00)
Posted by djk on 2013-12-13, 17:23:37 (205.175.225.23)
"how do you explain this ?" People that have too much money? I sold a design in 1997 that had a regulated front end and a pair of 3,300µF for the main rails (along with suitable bypass). The company t .......
110: RE: My latest tests... (0.00)
Posted by djk on 2013-12-12, 18:17:04 (205.175.225.12)
Another person that hasn't tried regulating the front end. "I don't think 30K per rail for that kind of power is too big." It's borderline for rectifier failure unless you add a soft-start. If you use .......
111: RE: Beer-can sized filter caps are not needed (0.00)
Posted by djk on 2013-12-12, 14:29:12 (205.175.225.12)
"But the current gain stages they need capacitance" No, they don't. The Crown I mentioned can put out 180A and only has a single 10,000µF cap in the main power supply. A Carver M1.5T can drive 50A on .......
112: Beer-can sized filter caps are not needed (0.00)
Posted by djk on 2013-12-11, 22:31:51 (205.175.225.12)
Beer-can sized filter caps are not needed for good performance. The voltage gain stages need a regulated supply, the current gain stages are fine with a loosely regulated supply. The original Electroc .......
113: Can it Weld ? (0.00)
Posted by djk on 2013-11-24, 00:38:25 (205.175.225.22)
It would need to be able to wake the dead first. I think the old Indy 500 system was more powerful, it used racks and racks of the MA10000, rated at up to 150V and 180A output per channel. You still w .......
114: RE: Correct, though I am aware that LA has... (0.00)
Posted by djk on 2013-10-06, 23:35:05 (205.175.225.23)
The Skunk river (Ames) passes far to the east of Des Moines. .......
115: RE: Counterpoint SA-20 (0.00)
Posted by djk on 2013-09-22, 23:40:21 (205.175.225.12)
If still available I would like it. I used to be a Counterpoint dealer, and always like the way they sounded. I am an electronics tech and can probably fix it, even if it needs the FET outputs. ::: T .......
116: RE: McIntosh C29 Power Relay (0.00)
Posted by djk on 2013-09-02, 00:41:07 (63.152.99.225)
Try replacing C703. .......
117: RE: What class (0.00)
Posted by djk on 2013-08-29, 14:11:32 (205.175.225.12)
It's a type of switching amplifier for the output transformer. .......
118: RE: Fuse size??? for tube amp (0.00)
Posted by djk on 2013-08-18, 03:24:42 (63.152.99.225)
I would try a 2A slo-blow. .......
119: Deaf ? (0.00)
Posted by djk on 2013-08-04, 21:58:18 (63.152.99.225)
There is a word that may apply to people that cannot hear the differences in components. All food tastes the same (if you have a zinc deficiency), all women kiss the same (if you're a eunuch), VHS and .......
120: 400/410/416 (0.00)
Posted by djk on 2013-07-20, 01:26:54 (63.152.99.225)
A Dynaco 400/410 should not drive less than 6Ω in stereo, or 12Ω in mono. A 416 will drive half that, 3Ω in stereo. If you want a good solid mono amp for a subwoofer, parallel the outpu .......
121: RE: tube output transformer secondaries (0.00)
Posted by djk on 2013-07-07, 13:23:58 (63.152.99.225)
25V is 80W/8Ω (or 40W/16Ω). If the amp is less than 80W (or your speaker less than 8Ω) you will need a matching transformer. .......
122: RE: An even simpler fix? (0.00)
Posted by djk on 2013-07-01, 13:21:26 (63.152.99.225)
Could easily cause the amplifiers to blow up. Been there, done that. Don't do it. .......
123: RE: Yeah, the millions of deaths from BEFORE grounds were added is so sad (0.00)
Posted by djk on 2013-07-01, 13:17:42 (63.152.99.225)
You think you're being witty, you may be half right. This is a safety issue, back off. I have described the contents of the patented Ebtech device, it uses two 6A diodes (300A surge). .......
124: RE: Cheater plugs can be life-savers, heh? /nt\ (0.00)
Posted by djk on 2013-06-30, 17:14:58 (63.152.99.225)
A cheater plug can be made safe by using a pair of inverse-parallel power diodes to interrupt the ground loop. The diodes provide a ground lift for voltages below ±1V, and will conduct in the event of .......
125: "Road Trip" (0.00)
Posted by djk on 2013-06-30, 16:47:58 (63.152.99.225)
The movie "Road Trip" with Tom Green had a product placement for Martin Logan loudspeakers. In the dorm room there was only room for one loudspeaker though! I doubt if anyone watching the film recogn .......
126: RE: Need help with schematic/manual to repair Hafler DH-200 (0.00)
Posted by djk on 2013-06-25, 00:00:58 (63.152.104.141)
Replace Q9, check P1. Virtually any NPN will do for Q9, a 2N2222, PN2222, ECG123A, 2N3904, 2N4401, etc. I had this part go out in a DH500, it was like a space heater. .......
127: RE: shield connected on one cable only (0.00)
Posted by djk on 2013-06-17, 02:00:37 (63.152.104.141)
Just buy a transformer and be done with the problem. .......
128: shield connected on one cable only (0.00)
Posted by djk on 2013-06-16, 13:51:11 (63.152.104.141)
Go ahead and try the cables with the shield connected on one cable only. An guaranteed absolute fix would be a 1:1 isolation transformer between the amp and preamp. Rowland Research actually provided .......
129: RE: Similar experience when I traded my Mac 2205... (0.00)
Posted by djk on 2013-06-13, 03:08:09 (63.152.104.141)
"Which caps are they DJK? I'll try them in my 2125." Add one 47µF across each ±42V rail at the main filter caps Add a 0.01µF~0.1µF film cap in parallel with C239, 240 (little board on the input jacks, .......
130: RE: A bit off-topic............ (0.00)
Posted by djk on 2013-06-09, 22:24:15 (63.152.104.141)
Though negative feedback usually improves the distortion characteristics of an amplifier, we find that in some cases it makes the distortion "messier." For instance, a common-source FET amplifier w .......
131: RE: A bit off-topic............ (0.00)
Posted by djk on 2013-06-08, 15:46:09 (63.152.104.141)
The figures are based on a constant input, producing H2 at -20DB (open loop). As you add 20dB of feedback the output drops by the same amount, the H2 drops by the same amount (now measuring -40dB), bu .......
132: RE: 400 Watt FETs?!!! (0.00)
Posted by djk on 2013-06-08, 15:31:44 (63.152.104.141)
They are IXYS parts. NP ignored me at the time I tried to bring them to the attention of the DIY community. This was at the start of the Lovoltec love affair (at which time I was told by Lovoltec that .......
133: RE: A bit off-topic............ (0.00)
Posted by djk on 2013-06-07, 21:08:59 (205.175.225.23)
It is well known that if we start with an amplifier with an open-loop square-law response it will produce only second harmonic distortion, but with overall negative feedback added higher order harmoni .......
134: RE: A bit off-topic............ (0.00)
Posted by djk on 2013-06-07, 13:17:40 (63.152.104.141)
Nope, I do mean feedback. .......
135: A bit off-topic............ (0.00)
Posted by djk on 2013-06-07, 00:12:34 (63.152.104.141)
In the beginning there was the phonograph. And it was good. And then came the tube. And it was, well it was louder. But not necessarily better. Feedback. Push-pull. FETs. Then transistors. The first t .......
136: Got it in one ! (0.00)
Posted by djk on 2013-06-06, 18:01:25 (205.175.225.23)
Very probable. (former Perreaux dealer service) The joints on the volume control go bad too, then it plays full blast wherever the control is set! .......
137: IXYS (0.00)
Posted by djk on 2013-06-05, 18:08:27 (205.175.225.23)
IXYS 10M45 .......
138: RE: OK (0.00)
Posted by djk on 2013-06-04, 02:38:27 (71.221.252.209)
Puns don't cross language barriers very well. "Baited Breath" "Fishy" .......
139: RE: OK (0.00)
Posted by djk on 2013-06-02, 20:46:36 (71.221.252.209)
"Baited Breath", this all sounds fishy to me. .......
140: Repair ? (0.00)
Posted by djk on 2013-06-01, 16:39:49 (71.221.252.209)
When it breaks it will be hard to repair. I have a parts unit around. I would much rather work on the Acurus. .......
141: PKN Amplifier (0.00)
Posted by djk on 2013-05-28, 15:29:39 (71.221.252.209)
1KW is kind of low for a shake table. The one rack space PKN is only 40KW (our shake tables at work have over 100KW behind them). .......
142: Crown CTs2000 (0.00)
Posted by djk on 2013-05-28, 02:37:17 (71.221.252.209)
1000W at 2Ω/4Ω/8Ω Crown’s CTs Series amplifiers provide exceptional performance, flexibility and value for installed sound applications. CTs Series amplifiers feature independent select .......
143: Once (0.00)
Posted by djk on 2013-05-12, 16:37:26 (71.221.252.209)
And then he earned the Darwin Award. .......
144: RE: Box (0.00)
Posted by djk on 2013-05-11, 00:22:43 (71.221.252.209)
Those kind of caps are quite large, no other reason. .......
145: Box (0.00)
Posted by djk on 2013-05-10, 18:10:23 (205.175.225.12)
They should be in a box, with a connector on the chassis, and the wire should have an outer jacket. I did this 40 years ago on a solid state stereo receiver, but that's a lot lower voltage. ::: TOPIC: .......
146: RE: I got the schematic (0.00)
Posted by djk on 2013-04-27, 02:31:15 (63.152.93.252)
http://www.digikey.com/product-detail/en/NJW0281G/NJW0281GOS-ND/1853548 http://www.digikey.com/product-detail/en/NJW0302G/NJW0302GOS-ND/1853549 http://www.digikey.com/product-detail/en/MJF15030G/MJF15 .......
147: RE: I got the schematic (0.00)
Posted by djk on 2013-04-26, 13:18:27 (63.152.93.252)
Buy only the ON Semiconductor parts, or throw the amplifier away. .......
148: Slow Down ! (0.00)
Posted by djk on 2013-04-25, 06:52:51 (63.152.93.252)
Fix the amp before replacing any caps. The transistors do need to be from the same Beta group (matched), but you may be able to get the amp working without replacing them (at first). Check the emitter .......
149: Exicon (0.00)
Posted by djk on 2013-04-18, 03:33:39 (63.152.93.252)
The stock B&K outputs are only 7A/100W. The Exicon are 16A/250W and will drop right in place. http://www.profusionplc.com/pro/gex/pcatdtl0?ipartno=ECF20N20 http://www.profusionplc.com/pro/gex/pcatdtl0 .......
150: RE: Need new amp (0.00)
Posted by djk on 2013-03-27, 00:34:49 (63.152.93.252)
With an infinitely large power supply a solid state power amplifier can almost double its power when you half the load impedance. With a small VA rating transformer it may not do hardly any extra powe .......
151: RE: Yes (0.00)
Posted by djk on 2013-02-23, 18:09:46 (63.152.93.252)
And my answers is still no, the magic box cannot make two amplifiers sound the same. The difference in sound is far more than amplitude, phase, and harmonic structure. .......
152: Yes (0.00)
Posted by djk on 2013-02-23, 17:09:46 (63.152.93.252)
Years ago I modified an amplifier for a recording studio. They called me back after some extended listening and told me I had added 'too much bass and treble' and they wanted me to reduce the amount I .......
153: RE: Altec 352a (0.00)
Posted by djk on 2013-02-22, 04:32:18 (63.152.93.252)
It has a Zobel, it should be OK. You could hang a high value resistor across the output as well. .......
154: DC (0.00)
Posted by djk on 2013-02-21, 12:34:36 (63.152.93.252)
. .......
155: Crest (0.00)
Posted by djk on 2013-02-10, 15:14:43 (63.152.93.252)
Some of the CK series Crest amplifiers are interesting. A friend from my workplace has some high efficiency speakers and was using my Nakamichi Stasis designed amplifier. He says one of the Crest ampl .......
156: RE: What about Magtech? (0.00)
Posted by djk on 2013-02-10, 14:45:19 (63.152.93.252)
Hmmm, sounds like an updated version of the Yamaha X amps from the 80s. They had the same two-supply (four counting the ±V rails) design with the regulator on the boost supply. I built a 200W subwoofe .......
157: Duroid (0.00)
Posted by djk on 2013-01-27, 23:29:02 (97.127.189.238)
Rogers Duroid is goo stuff, Teflon. About $1 a square inch for some versions. We use a lot of this at work, mainly for RF. .......
158: Red ! (0.00)
Posted by djk on 2013-01-27, 23:24:09 (97.127.189.238)
Hmm, the edge of the board looks red too. .......
159: Rowland (0.00)
Posted by djk on 2013-01-27, 15:48:23 (97.127.189.238)
Jeff Rowland must be an idiot then, some of his boards are red. .......
160: Handgrenade (0.00)
Posted by djk on 2013-01-23, 12:01:17 (97.127.189.238)
Seriously, the power supplies blow up. "The 6233 was not a true digital amp and was by no means a light weight amp it was produced starting not in 1975 but in 1978 until 1981 when the fact that they w .......
161: Backlight (0.00)
Posted by djk on 2013-01-18, 15:55:34 (205.175.225.22)
Replace the backlight for the display. .......
162: RE: Black or Brown (0.00)
Posted by djk on 2013-01-12, 22:05:17 (97.127.189.238)
Yeah, the brown ones are usually 6-32. .......
163: Black or Brown (0.00)
Posted by djk on 2013-01-11, 01:18:27 (97.127.189.238)
Black terminal block or brown terminal strip? The brown has captive screws, so I assume you have the black. They look like they could very well be 5-40 (about 0.125" dia), but they might be 6-32 too ( .......
164: RE: Any idea where I can find one ??? nt. (0.00)
Posted by djk on 2013-01-04, 06:27:00 (97.127.189.238)
This is made by ATI, a quality company. If the listing is closed contact the seller, he probably still has it. .......
165: RE: adcom gfa 5400 kaput (0.00)
Posted by djk on 2013-01-02, 22:32:17 (97.127.189.238)
Contact Adcom. Actually, this is not something I would recommend to the average technician, much less a neophyte. Whoever works on it will need matched sets for the outputs anyway. .......
166: RE: A few links. (0.00)
Posted by djk on 2013-01-02, 22:30:39 (97.127.189.238)
There is no schematic there. .......
167: RE: adcom gfa 5400 kaput (0.00)
Posted by djk on 2013-01-01, 08:47:06 (97.127.189.238)
Check the outputs for shorts. If shorted check and see if the source resistors are open, I think they are the fusible type. Check the gate resistors if the above is bad. Outputs are replaced as matche .......
168: RE: B&K upgrades. (0.00)
Posted by djk on 2012-12-28, 07:13:14 (97.127.189.238)
Give Chuck a call, he does good work. Charles J Cocci Home (508) 583-6766 331 Pleasant St Brockton, MA 02301-3235 .......
169: more complicated (0.00)
Posted by djk on 2012-12-25, 23:04:54 (97.127.189.238)
Which is why I said transfer function, and not crossover. I used to build a little 6-1/2" two-way with a 24dB/oct acoustic crossover,it had an 18dB high-pass and a 12dB low-pass with non-standard valu .......
170: RE: PMC IB2 amplification (0.00)
Posted by djk on 2012-12-25, 07:40:36 (97.127.189.238)
"How can I make sure the external XO will be as good (slope-wise, phase-wise etc.)?" You can't and there in lies the problem. I would contact the manufacturer and ask if they have a dividing network t .......
171: RE: PMC IB2 amplification (0.00)
Posted by djk on 2012-12-25, 07:02:51 (97.127.189.238)
It's quite simple really. When you biamp without a dividing network ahead of the amplifiers the amplifiers both receive the full range signal and both clip at the same point that they would when drivi .......
172: RE: PMC IB2 amplification (0.00)
Posted by djk on 2012-12-25, 06:31:40 (97.127.189.238)
The problem with speakers that are bi or tri wired is that the crossover parts are still all in the circuit, so you can't get the full benefit of biamping. If you could duplicate the transfer function .......
173: RE: PMC IB2 amplification (0.00)
Posted by djk on 2012-12-25, 01:57:46 (97.127.189.238)
Interesting product. I note that it is 89dB/2.83V and a 4Ω load. That means it's really 86dB/W/1M, not a problem for solid state. With passive biamping though it is a problem. The additional ampl .......
174: RE: Blue Circle Quiet cord/devices... (0.00)
Posted by djk on 2012-12-23, 06:53:32 (97.127.189.238)
For $300 or so I think I will make my own, thank you. .......
175: RE: Humbuster replacement? (0.00)
Posted by djk on 2012-12-22, 18:07:22 (97.127.189.238)
I am not aware of any others sold as a stand-alone unit. It is a pretty straightforward DIY project though. You could include other features while you were at it; Hum-X ground isolation, snubbers, RFI .......
176: 80% (0.00)
Posted by djk on 2012-12-22, 00:33:21 (97.127.189.238)
80% of all men exhibit signs of color-blindness. You would seem to be in that 80%. .......
177: Wanted (0.00)
Posted by djk on 2012-12-14, 16:05:36 (205.175.225.12)
The 'Wanted' feature doesn't seem to work today. .......
178: RE: Denon PMA S10 II - is there a tape monitor facility? (0.00)
Posted by djk on 2012-12-11, 01:22:25 (97.127.189.238)
" is there really no monitoring facility on the Denon amp?" Correct, there is no tape monitor function on this amp. Doesn't look like you can use any add-on (EQ, filter, DBX, etc). I never would have .......
179: GFA 555 (0.00)
Posted by djk on 2012-12-08, 23:57:12 (97.127.189.238)
Oops, I assumed you had the GFA 555. The 535 uses different parts. The same basic advice applies, use only parts from authorized distributors, and do both channels. MCM electronics should have what yo .......
180: MJ21195/96 (0.00)
Posted by djk on 2012-12-08, 12:11:50 (97.127.189.238)
I suggest you use ON Semiconductor MJ21195/96 for the outputs and replace both channels. Use MJE15032/33 (or 34/35) for the drivers. The original outputs were Toshiba, no longer available. The ON devi .......
181: RE: Yamaha P2700 PA amp (0.00)
Posted by djk on 2012-11-28, 15:58:10 (205.175.225.23)
Check the output with an oscilloscope, you're probably clipping. Live music has incredible dynamics. .......
182: RE: Is there a "go-to guy" for Chip Amps on Amp/Pre-Amp?? (0.00)
Posted by djk on 2012-11-28, 15:56:40 (205.175.225.23)
Try the chip amp forum at DIYaudio. .......
183: RE: McIntosh C29 Noisy Tone Control (0.00)
Posted by djk on 2012-11-20, 00:26:28 (63.152.69.89)
"The Parts list notes that these are stocked by McIntosh "and must be ordered from [them] " . Actually it says "All parts not listed are common items obtainable from radio parts jobbers". The caps are .......
184: RE: McIntosh C29 Noisy Tone Control (0.00)
Posted by djk on 2012-11-18, 14:15:13 (63.152.69.89)
It may also need the 10µF NP caps replaced on the bass switch board, C601, C602. They are about 30 years old now, and electrolytics don't last forever. .......
185: RE: Which one? (0.00)
Posted by djk on 2012-11-06, 05:55:59 (63.152.115.10)
There is usually a Zobel on the output of an amplifier, a cap around 0.1µ with a series resistor around 10Ω. If either of these go open the amplifier can oscillate. .......
186: RE: Damping factor and taming bass bloat ? (0.00)
Posted by djk on 2012-10-26, 12:12:36 (63.152.87.230)
I shouldn't have generalized, I don't have the schematics on his amplifier. My McIntosh MC2125 has a DF=20 at 8Ω, and a DF=16 at 2Ω. It is related to how the multi-filar output autoformer is .......
187: RE: Damping factor and taming bass bloat ? (0.00)
Posted by djk on 2012-10-25, 23:37:06 (63.152.87.230)
Using the wrong tap on a tube amp can result in an impedance mismatch and actually result in less power out. At low levels the higher impedance tap always sounds louder, but at moderate to higher leve .......
188: Muddy Bass ? (0.00)
Posted by djk on 2012-10-17, 13:03:48 (63.152.91.24)
You like muddy bass. Older designs sound warmer because of the un-bypassed electrolytics in the power supply. Newer designs have better caps (lower ESR) or power supply bypass caps. You could try remo .......
189: RE: Not on my watch (0.00)
Posted by djk on 2012-10-12, 00:04:40 (97.127.185.198)
"It crapped out big time on the Primary of the Transformer" What does this mean? Dayton Wrights, what was their minimum impedance (I know they claimed a 4Ω 'nominal')? If you didn't have them on .......
190: 0,25 OHMS (0.00)
Posted by djk on 2012-10-11, 01:07:42 (97.127.185.198)
Are we talking about the same amplifier? I have run these in dance clubs with eight 15s on one amplifier. They will drive a 0,25Ω load in mono, and one channel driven into 8Ω will clip at ab .......
191: RE: Adcom GFA-555 MkII blowing rail fuse (0.00)
Posted by djk on 2012-10-07, 10:04:24 (97.127.185.198)
If it is the early GFA555II and has the 2SD525/2SB595 (100V 5A 40W) pair they need to be replaced with the MJE15033/MJE15032 (250V 8A 50W). The 2SD525/2SB595 were hand selected to run far beyond their .......
192: Dr. Moscode (George Kaye of Moscode) (0.00)
Posted by djk on 2012-09-20, 22:52:42 (205.175.225.12)
http://www.whatsbestforum.com/showthread.php?786-Welcome-to-Dr-Moscode http://www.moscode.com/ http://www.meta-gizmo.net/ .......
193: RE: Sherwood AD260B Integrated Amplifier (0.00)
Posted by djk on 2012-09-18, 01:33:09 (63.152.106.226)
It will not be able to drive a 4Ω cabinet in bridge mode. It would need to be rated to drive 2Ω in stereo to be able to drive 4Ω in bridge. The mono switch is to send a L+R signal to th .......
194: RE: $270 plus shipping :) (0.00)
Posted by djk on 2012-09-14, 13:08:12 (63.152.107.161)
If I was enamored of it I might consider it (but that doesn't sound like the case here). My favorite Carver was the M1.0T. .......
195: RE: Anybody familiar with the workings of those old Carver M500ts (0.00)
Posted by djk on 2012-09-14, 00:52:58 (63.152.107.161)
Those can be difficult to repair. I think the flat-rate on those is $175 plus freight. .......
196: RE: cable affect on output impedance/damping factor? (0.00)
Posted by djk on 2012-09-05, 16:06:31 (205.175.225.22)
That is not a complete answer. If the external series changes the Qts drastically the cabinet will be mis-tuned (mostly vented designs). Usually a DF of 20 (implying a 0.4Ω resistance)or so is ad .......
197: Error ? (0.00)
Posted by djk on 2012-09-05, 12:42:44 (63.152.106.6)
He reduced the number of wires, increasing the resistance. There is usually an optimum DF for any given design, the lowest DCR (highest DF) is not always optimum. .......
198: RE: repair shops (0.00)
Posted by djk on 2012-08-04, 16:41:17 (63.152.94.169)
You can probably replace the main filter caps yourself. Charles (Chuck) Cocci lives in the Boston area, he's good. .......
199: RE: Another quote from the same thread. (0.00)
Posted by djk on 2012-07-28, 18:03:00 (71.221.252.89)
"I am of the opinion and experience that any good amp is compatible with any good speaker." Obviously none of us own good equipment. All food tastes the same (if you have a zinc deficiency), all women .......
200: RE: A bridged set of Hypex modules will exceed the output. (0.00)
Posted by djk on 2012-07-24, 00:13:28 (71.221.250.141)
It's already bridged. While it's possible to bridge a bridged amplifier, it's very tricky. .......
Found 1 records in Cable Asylum.
1: StarQuad (0.00)
Posted by djk on 2015-09-21, 19:51:09 (205.175.226.102)
The insulation on this wire is vastly better than PVC, and the StarQuad winding reduces inductance. For short runs they have a smalle gauge at half the price, for longer runs they have a larger gauge .......
Found 1 records in Isolation Ward.
1: Tin Foil Hat ? (0.00)
Posted by djk on 2010-07-01, 23:48:53 (71.213.231.214)
Why not make the pyramid out of layers of tin foil and paper, and mount your crystal on top? It might reduce RF from cell phone use as well. .......
Found 1 records in Propeller Head Plaza.
1: RE: Jitter Article & Listening Tests-With Music Files (0.00)
Posted by djk on 2013-08-19, 22:07:25 (205.175.225.12)
The first time I heard a CD play with bad jitter, I thought it was a tape deck with a flutter problem! .......
Found 1 records in Shutterbug Strasse.
1: Re: Anybody have some of their work online? (0.00)
Posted by djklmnop on 2002-04-26, 00:05:13 (63.166.187.46)
Mines is at http://www.vermillionstudios.com .......
Found 200 records in Speaker Asylum.
1: RE: rca mi-9595 (0.00)
Posted by djk on 2018-01-10, 16:21:05 (199.188.65.49)
The RCA horn system shown was originally in a 2,000 seat theater. They ended up in a large 24' x 48' garage for many years, and after rebuilding the networks with a 500hz\6dB crossover, and re-balanci .......
2: RE: rca mi-9595 (0.00)
Posted by djk on 2018-01-06, 13:01:41 (199.188.65.49)
Add a tweeter, done. A 290 on that horn is gone above 6.3Khz That horn was crossed at 500hz in the PL-301. With a tweeter crossed at 4Khz. .......
3: Bob Crites (0.00)
Posted by djk on 2017-10-10, 13:02:04 (199.188.65.49)
. .......
4: RE: Some people think speakers sound better on metal stands (0.00)
Posted by djk on 2017-10-08, 13:56:59 (207.191.195.70)
I found they sounded best with the midrange at ear level. If you bi-amped the NS690's, they sounded better than the NS1000's did. (I bi-amped several sets of NS1000's, as well as NS690's) .......
5: RE: Gefco... (0.00)
Posted by djk on 2017-10-01, 13:50:12 (207.191.195.70)
Vandersteen used many drivers from Gefco too. .......
6: NRB (0.00)
Posted by djk on 2017-09-28, 14:26:53 (199.188.65.49)
Considering that a Karlson box doesn't have much (if any) output below 50hz or so, I suggest you try a different kind of box. .......
7: RE: OK, point well-taken. But... (0.00)
Posted by djk on 2017-09-27, 16:47:51 (199.188.65.49)
Sorry, I can't help you with a current product recommendation. Madisound used to sell a driver made by Gefco that was really good, and inexpensive. They sell a similar driver made by MISCO, but I have .......
8: RE: SEAS Paper & Reed 5.5 and 7" midbass drivers? (0.00)
Posted by djk on 2017-09-26, 15:34:20 (199.188.65.49)
For that kind of money ($90), I would not expect it to have a huge peak around 5Khz. .......
9: RE: Harman Sold (0.00)
Posted by djk on 2017-08-31, 14:53:56 (199.188.65.49)
That you are being disingenuous? .......
10: Norelco (0.00)
Posted by djk on 2017-08-03, 14:17:03 (199.188.65.49)
Norelco (Philips) AD5061/M8 full range driver. Fabulous sounding driver, used by many as a midrange driver. Rated at 15W (full-range), 75hz~20Khz (-10dB points), it has a copper cap on the pole-piece .......
11: nothing to do with my post. (0.00)
Posted by djk on 2017-07-31, 16:57:40 (199.188.65.49)
Photobucket now wants $400 a year to use them. I didn't realize that was my avatar. .......
12: not the last word in detail (0.00)
Posted by djk on 2017-07-28, 14:25:00 (199.188.65.49)
"not the last word in detail " Remove all the drivers one at a time, cut off the push-on clips, strip the wire and solder directly to the driver terminals. After this is done the Forte will best a sim .......
13: $$$ (0.00)
Posted by djk on 2017-06-12, 15:22:18 (199.188.65.49)
The original caps were Callins electrolytics that cost pennies each (Callins made the best electrolytic crossover caps, but they had a short lifespan), some budget film caps that cost a couple of doll .......
14: RE: Mechanical buzz in JBL D123-question for speaker repair gurus (0.00)
Posted by djk on 2017-06-06, 16:53:16 (199.188.65.49)
A good speaker guy might be able to remove the dust-cap, clean and shim the gap, soften the spider with acetone, let it dry, test, and if OK put on a new dust-cap. .......
15: RE: Agree ... the first thing to try. nt (0.00)
Posted by djk on 2017-06-06, 16:40:48 (199.188.65.49)
"so at least that rules out cabinet and solution by rotating" So, it was in its original orientation for what, 40 years (and you rotated of 5 minutes)? Carefully put some acetone on the spider and mas .......
16: RE: Mechanical buzz in JBL D123-question for speaker repair gurus (0.00)
Posted by djk on 2017-06-06, 16:37:38 (199.188.65.49)
Make no attempt to remove an alnico magnet, if you manage to succeed (and you won't on the JBL) the magnet will lose a lot of its magnetism. .......
17: Check ! (Link) (0.00)
Posted by djk on 2017-03-25, 12:25:33 (199.188.65.49)
https://www.youtube.com/watch?v=RPcyAGJSWSI .......
18: RE: 'but I can't think of any other speaker models that have had such a run' (0.00)
Posted by djk on 2017-01-07, 11:15:55 (199.188.65.49)
"I can't think of too many others." Klipschorn, 1946 Heresy (~'58), Cornwall(~'58), LaScala(~'62). .......
19: RE: Got a chance at (0.00)
Posted by djk on 2016-12-10, 13:53:25 (199.188.65.49)
They sounded nice, in large part because of the push-pull mounting of the Philips 6-1/2" woofers. Limited output. A modern high-output push-pull subwoofer with four high excursion 12's. .......
20: RE: Reducing length of Rel T7 speaker leads to match mains (0.00)
Posted by djk on 2016-11-15, 16:02:28 (199.188.65.49)
The speed of light and the speed of sound are different, electrical signals essentially travel at the speed of light. .......
21: RE: Altec Lansing model Seven series 2... Any Good? (0.00)
Posted by djk on 2016-11-07, 16:20:03 (199.188.65.49)
The Altec Model Seven had one of the most colored sounding midrange of any loudspeaker I had ever heard. They made some great sounding speakers, this model was not one. .......
22: RE: Altec Lansing model Seven series 2... Any Good? (0.00)
Posted by djk on 2016-11-07, 14:19:21 (199.188.65.49)
They didn't sound anywhere near as good as the JBL L100/4311 when new. The foam edges have long, long ago since disintegrated. You have a monkey coffin (dog, cat, etc). A 4311 is a much better loudspe .......
23: RE: Braun LV 1020' (0.00)
Posted by djk on 2016-10-30, 14:42:21 (207.191.195.70)
I've had to repair those before. I suggest you replace all the electrolytics, and all the small plastic transistors (parts cost is quite small, really). They really do sound good, despite the cap-coup .......
24: RE: Giant Killers? (0.00)
Posted by djk on 2016-10-21, 14:15:57 (199.188.65.49)
I built four of these circa 1981. The mid horn is the same size as the RCA Ubangi, but with a better throat for 12's. The old RCA's are now retired to a community theater in Topeka (originally ins .......
25: RE: Has anyone done this with a subwoofer (0.00)
Posted by djk on 2016-10-11, 13:44:49 (199.188.65.49)
The Swarm does it (one amp, 4x subs). "A single high quality shelf-mounted amplifier drives The Swarm, and the subwoofer modules are connected in series-parallel. A second amplifier can be added if st .......
26: common ground ? (0.00)
Posted by djk on 2016-08-25, 17:08:04 (199.188.65.49)
Will work if the amplifier can drive a common ground. .......
27: Not really........ (0.00)
Posted by djk on 2016-07-26, 15:05:49 (199.188.65.49)
"the Macs in the right set up weren't as bad as some make them out to be. " Not much sport in shooting such an easy target. Bose isn't horrible either, until you consider the price. .......
28: RE: The old McIntosh XR series (0.00)
Posted by djk on 2016-07-25, 17:17:34 (199.188.65.49)
I was a McIntosh dealer in that time frame. We chose not to sell any of their loudspeakers, plenty of other better products to choose from. .......
29: $30 rebate (0.00)
Posted by djk on 2016-04-27, 16:24:41 (199.188.65.49)
There is the same price, PLUS a $30 rebate on Newegg.com .......
30: RE: Audax pr170m0 mid-range (0.00)
Posted by djk on 2016-04-25, 14:16:10 (205.175.226.96)
The high efficiency paper cone Audax 6.5" drivers were very hi-fi. Audax was destroyed by JBL, as was RCF by Mackie. .......
31: RE: Infinity RS1B (0.00)
Posted by djk on 2016-04-09, 13:48:39 (199.188.65.49)
A light bulb plus a PTC would probably help. .......
32: RE: sealed boxes with push-pull bass drivers (0.00)
Posted by djk on 2016-04-04, 17:33:40 (199.188.65.49)
It will work, use a Linkwitz-Transform. I would mount both drivers on the outside of the box in a push-pull fashion and just use the Linkwitz-Transform, 6dB more maximum output above the Fc of the box .......
33: RE: Weldbond (0.00)
Posted by djk on 2016-03-24, 16:54:16 (199.188.65.49)
No, it's a PVA emulsion. Water soluble, and is perfect for foam (not for rubber though). .......
34: Weldbond (0.00)
Posted by djk on 2016-03-23, 16:48:52 (199.188.65.49)
Weldbond will fix it right up. Thin it out a bit with water, and apply several thin coats, usually three will do it. Wait about 30~45 minutes between coats, let dry overnight. I have been doing this f .......
35: Yes (0.00)
Posted by djk on 2016-03-22, 17:55:26 (199.188.65.49)
I built a half dozen of those designs, I bought the drivers in case lots. .......
36: Ozone (bad?) (0.00)
Posted by djk on 2016-03-07, 23:01:43 (205.175.226.96)
Ozone destroys rubber. .......
37: RB-75 (0.00)
Posted by djk on 2016-02-25, 23:09:54 (205.175.226.101)
The RB-75 is the best, about $500 for a nice pair. .......
38: RE: JBL L150 Bypass LPAD resistor values (0.00)
Posted by djk on 2016-01-28, 22:37:03 (205.175.226.96)
Adjust the L-pad until it sounds best, then measure the values, order the closest higher values, then parallel with smaller higher values until you get them spot on. .......
39: RE: Advice on building a pair of passive Subwoofers.. (0.00)
Posted by djk on 2015-12-17, 14:40:37 (205.175.226.97)
Two comments: Pick another driver. Biamp. .......
40: RE: EV SRO-15 for a Sub Woofer (0.00)
Posted by djk on 2015-12-14, 13:58:41 (205.175.226.98)
"Any ideas?" Try another driver, that one will not work well. .......
41: RE: How fragile Dunlavy SC-V ? (0.00)
Posted by djk on 2015-12-07, 22:47:54 (205.175.226.97)
Isn't it a Morel tweeter? They are quite rugged. .......
42: RE: Crossover resistor values (0.00)
Posted by djk on 2015-10-26, 22:58:19 (205.175.226.101)
A 15R resistor in parallel with the 10R will give you 6R. .......
43: Especially if you seek low level resolution (0.00)
Posted by djk on 2015-10-22, 23:16:55 (205.175.226.98)
"Especially if you seek low level resolution - which are lacking in those fifty year old designs." This will fix that: .......
44: RE: old crossovers (0.00)
Posted by djk on 2015-10-19, 23:20:14 (205.175.226.102)
Electrolytics? 20+ years and it's worth it to replace. Lead attachment points may fail on film caps, it may be worthwhile to replace after 30+ years (but they can fail before then). Caps generally fai .......
45: RE: Small speakers that are NOT (0.00)
Posted by djk on 2015-10-15, 23:30:02 (205.175.226.102)
If you believe those specs, I have a bridge for sale. .......
46: BelchFire V8 ! (0.00)
Posted by djk on 2015-09-25, 14:25:17 (205.175.226.96)
An exclusive product from WhiteVan? .......
47: RE: Technical question.... tweeter. (0.00)
Posted by djk on 2015-08-31, 23:35:56 (205.175.226.97)
Sounds like it has been dropped. Remove the dome and look at the gap. If shifted, time for a new tweeter. .......
48: Stanley Clarke (0.00)
Posted by djk on 2015-08-12, 23:47:27 (205.175.226.98)
Bose and Karlson .......
49: 400hz (0.00)
Posted by djk on 2015-08-11, 15:02:24 (205.175.226.100)
A 3-1/2" driver makes a nice midrange, if you can cross it over at at least 400hz or so. Or mount a pair on a coathanger, and use for headphones. .......
50: Audio Magazine (0.00)
Posted by djk on 2015-07-25, 20:37:39 (205.175.226.99)
Many, many years ago Audio did tests to determine what kind of directivity factor sounded best in a typical room. They found that a Q=7 gave the best results (a typical 90°x 40° horn at the time). Hor .......
51: RE: substitute driver for Adire 15" passive radiator (0.00)
Posted by djk on 2015-07-06, 23:12:23 (205.175.226.98)
Depending on the alignment, the PR may need to have a volume displacement of up to 3x that of the woofer. The EV Interface A had a driven 8 and a 12 PR with 400 grams mass. In use the PR could visibly .......
52: DA (0.00)
Posted by djk on 2015-06-05, 23:16:11 (205.175.226.38)
Dielectric Absorption is more important for audio quality. .......
53: Sweet Home Alabama at 1,000,000V (0.00)
Posted by djk on 2015-05-28, 22:55:41 (205.175.226.34)
(two at 500,000V) .......
54: RE: What speaker from at least 20 years ago do you wish you could still buy new? (0.00)
Posted by djk on 2015-05-25, 19:48:40 (205.175.226.37)
"Rectalinear 3. " Rectilinear III highboy (the Xa had the same midrange driver, a varient also used by Dahlquist, Genesis, Infinity, Crown, etc) Tannoy Cheviot ADS L400 EPI M50 JBL L16 (add sub to the .......
55: RE: Avionics? Really?? (0.00)
Posted by djk on 2015-05-08, 15:32:06 (205.175.226.39)
In avionics we generally use a humidity cured silicone, not the acid type. The type we use takes 18 hours in a humidity and temperature controlled chamber. Normal hardware store RTV will dissolve the .......
56: RE: Questions about speaker crossover setup (0.00)
Posted by djk on 2015-04-29, 23:20:54 (205.175.226.37)
You're correct sir. I used to build a 6-1/2" two way with a LR24 (acoustic) crossover. Electrically this looked like a 12dB low-pass and an 18dB high-pass. .......
57: RE: Questions about speaker crossover setup (0.00)
Posted by djk on 2015-04-29, 18:13:10 (205.175.226.33)
That's not correct, changing the impedance only changes the Q of the network, not the frequency. See the response of Brian HP. .......
58: RE: Questions about speaker crossover setup (0.00)
Posted by djk on 2015-04-29, 01:48:16 (205.175.226.32)
Depends on the impedance of the driver, and the Q you need. .......
59: RE: Observable Woofer Cone Movement (0.00)
Posted by djk on 2015-04-20, 15:06:12 (205.175.226.38)
Give us a time into the video please. .......
60: RE: KLH 17 (0.00)
Posted by djk on 2015-04-19, 22:26:41 (205.175.226.37)
This is the style they had in the early 70's when we sold them. .......
61: Gee (0.00)
Posted by djk on 2015-04-19, 22:16:44 (205.175.226.37)
Gee, it looks exactly the same as the balanced type I posted. The unbalanced type I posted is used by B&W in several models. .......
62: RE: Don't the 63s have MILES of wire in their delay line... (0.00)
Posted by djk on 2015-04-17, 22:50:19 (205.175.226.38)
No, the coils are small, and the frequency response unchanged. .......
63: Crossover point (0.00)
Posted by djk on 2015-04-17, 15:37:46 (205.175.226.38)
If the woofer in question is in a two-way design, the dust cap being pushed in affects the midrange. .......
64: a few changes (0.00)
Posted by djk on 2015-04-15, 00:10:58 (205.175.226.32)
The originals may be made listenable with a few changes. Changing the tweeter is the first step, then a minor network change, and lastly a cabinet brace. At that point you will be 99% of the way to a .......
65: RE: KEF, B&W, etc. (0.00)
Posted by djk on 2015-04-15, 00:02:08 (205.175.226.32)
You missed the few good Klipsch then. The Forte was exceptional, and the Cornwall II was very good. The Forte measures better than ±2dB IN ROOM (above 250hz to get above the room modes). Another speak .......
66: KEF, B&W, etc. (0.00)
Posted by djk on 2015-04-13, 18:29:04 (205.175.226.37)
I was a dealer for Klipsch and KEF. The KEF 104.2 sounded very colored when compared with a Cornwall II or original Forte. The original Cornwall left something to be desired. The comments from Lt Ein .......
67: RE: Are Cornwalls Still Current? (0.00)
Posted by djk on 2015-04-10, 23:58:13 (205.175.226.38)
" Is there anything out there similar to the Cornwalls in terms of price and efficiency that's considered to be sonically superior?" Not that I am aware of. If you have DIY skills you might be able to .......
68: Don't (0.00)
Posted by djk on 2015-04-09, 15:45:04 (205.175.226.38)
Don't let these guys talk you out of the Yamaha, it's a great sounding amplifier. Only problem I have with those is they can sound real nasty when you push them over into clipping. Is that a real issu .......
69: RE: Klipsch Cornwall (0.00)
Posted by djk on 2015-04-08, 15:27:32 (205.175.226.33)
CWII, ForteI, etc. I prefer the original Forte over the Cornwall II, but you need a bigger amp. .......
70: RE: Advent 3 (0.00)
Posted by djk on 2015-04-05, 23:10:58 (205.175.226.39)
Just tack a 0.1µF film cap across the cap feeding the tweeter, this will increase system detail and clarity. Should be good to go otherwise (no foam edges here). .......
71: Bag End (0.00)
Posted by djk on 2015-04-03, 18:08:31 (205.175.226.33)
8hz .......
72: MTM (0.00)
Posted by djk on 2015-03-29, 01:43:10 (205.175.226.34)
Go listen to one in a real room before getting too excited. (not a fan of the MTM) .......
73: Phone (0.00)
Posted by djk on 2015-03-14, 19:09:17 (205.175.226.34)
All you need is a phone number for contact. I can have drivers made, shipped to a cabinet company, who will install and ship to my dealers, with nothing more than a phone number. A friend and I did th .......
74: RE: Klipsch Heritage Series as sudden obsession (0.00)
Posted by djk on 2015-02-28, 22:40:11 (205.175.226.32)
"Care to elaborate on the "no-money" part?' Here it is: cut off all the push-on connectors, stip, tin, and solder then straight to the drivers. Bob Crites loves my mod, because most people can't solde .......
75: RE: Klipsch Heritage Series as sudden obsession (0.00)
Posted by djk on 2015-02-28, 00:32:48 (205.175.226.32)
The KG4 is OK, if that what is available locally, go for it. Make sure the horns sound OK, or you will be coughing up about $60 for a matched pair of diaphragms. Early KG4 had a RXE 090 tweeter protec .......
76: RE: Cornwall II vs. Cornwall III (0.00)
Posted by djk on 2015-02-24, 22:45:21 (205.175.226.19)
I like it better than the original Cornwall, better tweeter, better crossover, brace from front-to-back. .......
77: they're good (0.00)
Posted by djk on 2015-02-24, 00:19:26 (205.175.226.32)
I sold a lot of those, they're good. A good 50W SS amp or 35W tube is adequate. I like the Forte best, followed by the Cornwall II. You might also keep an eye out for the Quartet. The above mentioned .......
78: More area = longer (0.00)
Posted by djk on 2015-02-21, 15:55:41 (205.175.226.19)
Which leads to less net volume, requiring recalculation, etc. With T/S parameters and net box volume I can run it for you (BassBox Pro v6.0). .......
79: -3dB (0.00)
Posted by djk on 2015-02-17, 22:55:22 (205.175.226.39)
The midrange control on these needs to be set at -3dB to measure flat. I measured these with a gated swept sine wave analyzer, and they measured much flatter (when adjusted properly)than most speakers .......
80: EMIM (0.00)
Posted by djk on 2015-02-15, 19:58:06 (205.175.226.32)
The EMIM drivers (mids) have magnet structure problems, even though they may have been 'new' they probably had to be repaired before use. Russel Coco (an independent dealer/repair center) was a go-to- .......
81: RE: Infinity IRS Betas (0.00)
Posted by djk on 2015-02-13, 23:48:33 (205.175.226.37)
I disagree, it is easy to weed out the horrible sounding speakers this way. .......
82: RE: Infinity IRS Betas (0.00)
Posted by djk on 2015-02-13, 00:06:28 (205.175.226.37)
"Why do people waste time demoing a system on the internet when all you get is your computer?" Headphones? There is a guy at a site in Asia that drags the same jazz recording around in his travels and .......
83: RE: Long shot speaker question about Allen Organ speakers... (0.00)
Posted by djk on 2015-01-23, 15:30:05 (205.175.226.19)
. .......
84: RE: KEF 104/2 woofer substitution (0.00)
Posted by djk on 2015-01-06, 22:52:09 (205.175.226.33)
Do you need the whole driver? Is it fried? Foam surrounds and the doughnuts are available at reasonable cost. .......
85: RE: To me, this implies... (0.00)
Posted by djk on 2015-01-06, 15:23:43 (205.175.226.37)
Tons of three-hole mount drivers out there with provisions for the force-canceling rod? (not) .......
86: RE: First Graphene Audio Speaker Easily Outperforms Traditional Designs (0.00)
Posted by djk on 2014-12-23, 01:30:12 (205.175.226.33)
5mm diaphragm? GMAFB! Buy some Stax electrostatic phones (or condensor). .......
87: RE: KEF (0.00)
Posted by djk on 2014-12-10, 23:11:43 (205.175.226.19)
"What is bad in just a 12"-15" woofer in a box design ?" Distortion. "I understand i will not get the very low bass" Incorrect. "Why study complicated designs ?" Less distortion. "I like the cinema sp .......
88: KEF (0.00)
Posted by djk on 2014-12-09, 18:27:50 (205.175.226.38)
The alnico Tannoy DC 12's from decades ago are quite good, I was a dealer for them. The 10's sounded nasal, the 15's lacked the midrange detail the 12's had. With a PPSL woofer they would sound quite .......
89: RE: Wonderful --- but imposing for a small living room (0.00)
Posted by djk on 2014-12-08, 15:25:13 (205.175.226.33)
The Wilson are fine for what they are (a friend of mine is a Wilson dealer). PPSL has less distortion though, I have made units as small as two 8's (AudioPro made a dual 17cm unit). .......
90: RE: Wonderful --- but imposing for a small living room (0.00)
Posted by djk on 2014-12-02, 23:29:31 (205.175.226.38)
Size? A sub might be a 2' cube, or smaller (if you can live with less efficiency). The tops can be quite small if crossed above 100hz of so. I used to build a small 6-1/2" two-way with a Vifa waveguid .......
91: RE: PPSL (0.00)
Posted by djk on 2014-12-02, 00:20:56 (205.175.226.38)
A single pair of these 12's will reach 25hz in room, and be over 100dB/2.83V/1M. Two-way with 8 and round horn with JBL/BMS driver that might satisfy you. Big EV stuff with JBL 4508 cinema boxes w .......
92: PPSL (0.00)
Posted by djk on 2014-12-01, 18:25:41 (205.175.226.19)
Any of my PPSL designs will do it. I was at a friend's house last night listening to my latest PPSL effort (with quad 12's), I was stunned at how well they integrated with the mids and HF, and we comp .......
93: $229K (0.00)
Posted by djk on 2014-11-21, 22:42:29 (205.175.226.32)
When they first came out they were 'only' $229K. .......
94: $600K Magico (nt) (0.00)
Posted by djk on 2014-11-21, 15:21:13 (205.175.226.34)
. .......
95: RE: Impedance balance circuit for tube amp question (0.00)
Posted by djk on 2014-11-11, 20:43:56 (205.175.226.19)
It's for the midrange, based on the values. .......
96: Nestovoric ! (0.00)
Posted by djk on 2014-10-30, 23:51:01 (205.175.226.19)
Foam and caps should do it. .......
97: RE: Need good cheap sub with high level high pass filter output (0.00)
Posted by djk on 2014-10-16, 23:12:52 (205.175.226.19)
" I need a sub with high level in and high pass filtered high level out or I will have to tack on a high pass filter to a sub without a filter. " The HSU filter is line level. .......
98: RE: Need good cheap sub with high level high pass filter output (0.00)
Posted by djk on 2014-10-16, 18:11:45 (205.175.226.19)
The high-pass filter in a powered sub is nothing more than an electrolytic cap. Add your own in series with the Pioneer speakers and you can add a film cap in parallel so it will sound OK. ::: TOPIC:: .......
99: RE: I listen to a 75 year old speaker (0.00)
Posted by djk on 2014-10-14, 15:07:22 (205.175.226.19)
They want that big RCA sound, but in the size of a box of Pop-Tarts. (former Ubangi and Olson bin owner) Note the super tweeter on piano wire in front of the HF horns. .......
100: RE: Ozzy - So if Corns are up for sale, what is the new direction? (0.00)
Posted by djk on 2014-09-12, 23:04:54 (205.175.226.19)
Home made, based around a Klipsch Cornwall bass section and (originally) a Klipsch LaScala mid and HF section. .......
101: +1 (nt) (0.00)
Posted by djk on 2014-07-30, 18:10:45 (205.175.225.12)
. .......
102: AMT 5 (0.00)
Posted by djk on 2014-07-16, 01:12:13 (205.175.225.22)
3.5Khz 18dB/oct minimum crossover, use a 211-2 lightbulb in series for protection. .......
103: RE: speakers efficiencyf (0.00)
Posted by djk on 2014-06-16, 15:46:51 (205.175.225.12)
If the original speaker was specified at 2V it is probably a 4Ω speaker. A 4Ω speaker that is 87dB/W/1M efficient will have a 90dB sensitivity, 90dB/2.83V/1M. .......
104: Midrange (0.00)
Posted by djk on 2014-06-03, 22:56:27 (205.175.225.22)
Adding a subwoofer to a system that already has adequate bass can really clean up the midrange. A crossover like the old Dahlquist unit is easy to do, it's one capacitor at the input to the power amp .......
105: RE: OK for an amp with a common ground...... (0.00)
Posted by djk on 2014-05-30, 22:51:08 (205.175.225.12)
Correct, no bridged output scheme (very rare at best). A resistor in parallel with the sub will lower the level (as shown on the original center speaker). It should be close enough for a garage system .......
106: RE: I made it work! (0.00)
Posted by djk on 2014-05-29, 22:54:39 (205.175.225.22)
Replace the center speaker with your subwoofer, and the L-pad across it with a 200µF capacitor (available from a car stereo install shop). .......
107: RE: PSB (0.00)
Posted by djk on 2014-05-21, 18:08:59 (205.175.225.12)
Norelco (Philips) drivers. .......
108: RE: what do you find is the best material for small foam surround repair? (0.00)
Posted by djk on 2014-05-20, 20:17:22 (205.175.225.12)
I like Goop, but Weldbond is better for this job. .......
109: RE: I would suggest polyurethane 50 year guarantee stuff. clear. (0.00)
Posted by djk on 2014-05-19, 18:23:09 (205.175.225.22)
Wrong stuff, avoid. .......
110: RE: what do you find is the best material for small foam surround repair? (0.00)
Posted by djk on 2014-05-19, 18:22:14 (205.175.225.22)
Weldbond is flexible. .......
111: RE: Feedback on 2 vintage speaker brands. (0.00)
Posted by djk on 2014-05-16, 23:05:31 (205.175.225.12)
I was a McIntosh dealer back in the day. We would not carry their speakers, they were expensive, and did not sound very good. .......
112: RE: what do you find is the best material for small foam surround repair? (0.00)
Posted by djk on 2014-05-16, 18:08:51 (205.175.225.12)
Massage some Weldbond into the tear. After it dries, apply a thin layer on both the backside and the front too. .......
113: SEAS H253 (0.00)
Posted by djk on 2014-04-02, 15:34:45 (205.175.225.23)
As used in early Boston models. Use data sheet to select a replacement driver (if needed). Boston may still offer a re-build on these, its been a while since I was a Boston service center. ::: TOPIC:: .......
114: RE: Argos Sound Director Model Number 50-1100 (0.00)
Posted by djk on 2014-04-01, 20:20:01 (205.175.225.12)
Garage speakers at best. .......
115: RE: Infinity renaissance 90 emit and emim (0.00)
Posted by djk on 2014-03-26, 15:43:10 (205.175.225.23)
You might have to contact his son Russell J Coco, civil engineer, to get his father's phone. His father calls me about once a week, but I would have to search for his number (at my home, I'm at work .......
116: RE: Infinity renaissance 90 emit and emim (0.00)
Posted by djk on 2014-03-25, 14:44:13 (205.175.225.12)
Call Russel Coco in Baton Rouge, he works on old Infnity Emims. .......
117: Quad 15's (0.00)
Posted by djk on 2014-03-18, 23:19:23 (205.175.225.12)
Baldwin organ had a quad 15 cabinet that worked better than the EV 30W. You could use a manifold with the quad 15's and just pretend you had the EV driver in it. You can use new drivers, pay less, and .......
118: Altec (0.00)
Posted by djk on 2014-03-06, 20:03:56 (205.175.225.23)
Altec went through the same issue with a screw and terminal change. Charged a bunch of money for a handful of screws and a couple of push-on lugs. .......
119: RE: Changing a Horn Driver Diaphragm (0.00)
Posted by djk on 2014-03-05, 14:39:23 (205.175.225.22)
Did you have a question? There are instructions on line on how to do this, you need a screwdriver and some masking tape. .......
120: RE: Isobarick Subs - Bi amp good idea or WOT? (0.00)
Posted by djk on 2014-03-03, 23:21:35 (205.175.225.12)
RCA invented it, and they used a 12 behind a 15. The box was about 2 cu ft net vs the regular 8 cu ft used for that 15. The drivers were in series, and the impedances were such that the 12 recieved mo .......
121: RE: Isobarick Subs - Bi amp good idea or WOT? (0.00)
Posted by djk on 2014-03-03, 18:59:05 (205.175.225.23)
This is not a good idea, isobaric in general is not the best idea either. Isobaric requires two idential drivers that are driven with the identical signal, amplitude, phase, the whole nine yards. I'm .......
122: Cut (0.00)
Posted by djk on 2014-02-27, 13:58:40 (205.175.225.12)
You will find you may need to cut off one leg to get those to fit properly on a McIntosh. Parts Express sells them as well. .......
123: Check ! (0.00)
Posted by djk on 2014-02-21, 22:48:23 (205.175.225.23)
Check This Out! .......
124: RE: I Think That It Looks More Like............ (0.00)
Posted by djk on 2014-02-17, 21:41:14 (205.175.225.12)
Massive mutant sperm! .......
125: Fine, but..... (0.00)
Posted by djk on 2014-02-03, 20:21:49 (205.175.225.22)
Fine, but make sure the gain structure/volume control on the AUX amplifier is set up quite high to avoid distorting the Bose EQ. .......
126: RE: Isn't the 4311 Xover really simple?... (0.00)
Posted by djk on 2014-01-07, 16:36:00 (205.175.225.23)
Yes, just two caps. That's all they need to measure flat and sound good though. .......
127: RE: Opinions on JBL 4311 loudspeakers (0.00)
Posted by djk on 2014-01-06, 15:33:57 (205.175.225.23)
Try the search function, all the answers you request have been discussed (over and over and over). Woofer=cloth Mid=treated paper Replace the controls, set the mid control to -3dB and they measure fla .......
128: RE: ULTRAPHASE question (Gary or others) (0.00)
Posted by djk on 2014-01-06, 15:32:00 (205.175.225.23)
Those look like the 10" three-way. They made 8, 10, 12 inch versions, as well as an 8" two-way. They sound good, and may be worth fixing up. .......
129: RE: Bridged or bi-amp (0.00)
Posted by djk on 2013-12-06, 15:58:35 (205.175.225.23)
"Each speaker has two sets of terminals," Must be a newer version, I have never seen two sets of terminals, and the schematic I have does not show two sets. If you do have two sets you could bi-wire .......
130: RE: Bridged or bi-amp (0.00)
Posted by djk on 2013-12-05, 19:56:06 (205.175.225.22)
The speakers are not set up to bi-wire or bi-amp. The amplifier will blow up if you bridge it into those speakers. If you know someone that is real good at soldering, cut the push-on terminals off the .......
131: StarQuad (0.00)
Posted by djk on 2013-11-30, 22:30:45 (205.175.225.12)
With two-conductor zip cord like wire you will want to twist it so it resembles a square box, and then cross connect the conductors. .......
132: NLA (0.00)
Posted by djk on 2013-11-30, 22:21:43 (205.175.225.12)
They image quite well, but you will need a sub if you expect them to play loud, or you expect bass. Repair parts are no longer available. .......
133: RE: General question on drivers time alignment (0.00)
Posted by djk on 2013-11-17, 22:58:04 (205.175.225.22)
I once found the best location for a mono sub the be about 12 feet back from the front speakers, and directly to the side of the listening position, at a distance of about 6 foot. As Tom pointed out, .......
134: RE: KEF 204 (0.00)
Posted by djk on 2013-11-14, 18:30:28 (205.175.225.12)
If the foam has been replaced recently, otherwise probably not. .......
135: RE: Blown Paradigm Speaker (0.00)
Posted by djk on 2013-11-14, 18:28:29 (205.175.225.12)
Buy a $10 voltmeter anywhere, lumberyards frequently have them too. .......
136: Perhaps (0.00)
Posted by djk on 2013-11-09, 22:25:58 (205.175.225.12)
Perhaps it was the poor value they represented. A Fiero was a nice ride, but they didn't charge Lamborghini prices for them. I really liked the Bose boom-box when it came out 30 years ago, but is it w .......
137: Well Said ! (0.00)
Posted by djk on 2013-10-27, 00:13:20 (205.175.225.12)
Well said. I have selected some recordings that will literally make you jump when played back on a good system. One fellow lunged to his feet (from being seated on the couch) when Tricycle (Flim & the .......
138: RE: Absolute Phase (0.00)
Posted by djk on 2013-10-26, 23:47:18 (205.175.225.12)
"I don't" I can demonstrate it to you, I'll even let you wear earplugs and you will be able to tell (hint: you can feel it). If you don't want to believe it, fine. Makes no difference to me. "By the w .......
139: RE: Absolute Phase (0.00)
Posted by djk on 2013-10-26, 21:11:30 (205.175.225.12)
Not everyone can hear it, not all recordings are made such a way with the right kind of material to hear it, and not all speakers can reproduce the sound with enough weight to hear it. I used to work .......
140: RE: East Coast vs West Coast Sounding Speakers (0.00)
Posted by djk on 2013-10-26, 20:45:07 (205.175.225.12)
Even back in the day it was something of a misnomer. You could adjust the mid and HF controls on a JBL L-100 to make them have the balance of an AR3a, or the reverse, or you could make either of them .......
141: Test (0.00)
Posted by djk on 2013-10-08, 18:13:30 (205.175.225.22)
For test purposes at a very low level you may use a polarized cap. If the network part is bad, order the correct type for replacement use. .......
142: RE: Elmer's Glue, huh? (0.00)
Posted by djk on 2013-10-04, 14:11:03 (205.175.225.23)
Are you attempting to seem annoying or idiotic? The TAD driver in question was designed by a JBL engineer to be field serviceable. If a person is all thumbs, it might be a good idea to hire the work d .......
143: RE: TAD 2001 Driver beryllium diaphragm I need one (0.00)
Posted by djk on 2013-10-04, 14:06:42 (205.175.225.23)
For a 2001? I think not. .......
144: RE: He's not going to replace a diaphragm (0.00)
Posted by djk on 2013-10-02, 17:13:06 (205.175.225.22)
"What, are these only available through TAD for people with TAD drivers " Kind of. The 2001 has a 48mm voice coil, most 1" drivers have 44.4mm voice coils. Follow my link titled $800 if you need to bu .......
145: $800 (0.00)
Posted by djk on 2013-10-01, 22:28:23 (205.175.225.23)
http://www.proaudiodesign.com/TAD-DP-2001.html .......
146: RE: Speakers- JBL Olympus C50 (0.00)
Posted by djk on 2013-09-24, 18:11:11 (205.175.225.22)
The original white JBL foam got hard in just a few years. Second generation gray foam got soft after a dozen years. Current generation of foam is much better. .......
147: RE: ESS AMT 3 Rock Monitors (0.00)
Posted by djk on 2013-09-23, 18:37:03 (205.175.225.22)
4Ω .......
148: RE: big decision to mov based on what could be... (0.00)
Posted by djk on 2013-09-06, 00:12:45 (63.152.106.213)
That's a great ratio for the size, does your rig have enough oomph to fill that space? .......
149: no ! (0.00)
Posted by djk on 2013-09-06, 00:07:31 (63.152.106.213)
Run a wire from the tape out of one system to any high level input on the other system. You can generally run about 100' without running into problems. If you get a ground loop use a 1:1 transformer, .......
150: In the 50's (0.00)
Posted by djk on 2013-09-05, 16:12:56 (205.175.225.12)
People chose an enclosure and bought driver kits. JBL offered enclosures they had made for them by various furniture makers, and offered various driver options for each enclosure. .......
151: 4311 (0.00)
Posted by djk on 2013-08-19, 22:23:08 (205.175.225.12)
You really want the L100A or 4311 with the LE-25 tweeter, not the earlier version. You also need to turn the Presence control back to -3, leave the tweeter at 0. This will measure dead flat, and sound .......
152: RE: speakers to match up to sansui 990 receiver (0.00)
Posted by djk on 2013-08-19, 21:57:25 (205.175.225.12)
If you can find a local pair of 4430's, grab them. Very un-colored, they sound great on anything, classical to country to death metal. They go much deeper in the bass than any of the others I listed ( .......
153: Piezo ? (0.00)
Posted by djk on 2013-08-19, 21:49:14 (205.175.225.12)
Ribbon? I think you mean the piezo film tweeter. Piezo tweeters done right can sound quite good. .......
154: RE: speakers to match up to sansui 990 receiver (0.00)
Posted by djk on 2013-08-18, 03:20:18 (63.152.99.225)
I had a friend that had Altec Valencia's on his Sansui 880, it sounded very similar to my Altec A7's and Sansui 707. A short list, no order: Altec Valencia, Model 19, A7 (big), Electro-Voice Sentry 3, .......
155: Poly-Planar ? (0.00)
Posted by djk on 2013-08-10, 02:19:31 (63.152.99.225)
I suspect they are based on the Poly-Planar drivers from the 70's. Many sizes were available, up to 24" x 48" for drop-in ceiling use. Bertagni Loudspeakers were similar in design and construction. Go .......
156: RE: Sorry your pics on DIYaudio don't work and same here at AA (0.00)
Posted by djk on 2013-07-13, 17:27:42 (63.152.99.225)
It looks like it should be OK to me. .......
157: RE: Sorry your pics on DIYaudio don't work and same here at AA (0.00)
Posted by djk on 2013-07-12, 18:12:53 (205.175.225.22)
To see pictures from DIYaudio one needs to be registered at DIYaudio (free). .......
158: RE: Modifying the Paradigm Atoms (0.00)
Posted by djk on 2013-07-05, 17:01:08 (63.152.99.225)
Film and foil types sound better, but a 2.2µF FF type is quite expensive ($40+ a pair plus shipping). The solution (for me) is to use a FF bypass around a metalized film type. It costs about $1.50 (th .......
159: RE: Modifying the Paradigm Atoms (0.00)
Posted by djk on 2013-07-01, 13:00:27 (63.152.99.225)
One cap, cheap variety of electrolytic. .......
160: RE: Modifying the Paradigm Atoms (0.00)
Posted by djk on 2013-06-30, 16:33:43 (63.152.99.225)
The networks for sale on eBay had the values I mentioned (that's why I said what I said). .......
161: Wrong sizes ? (0.00)
Posted by djk on 2013-06-30, 01:41:32 (63.152.99.225)
The most commonly used size on loudspeaker tabs is 0.205" x 0.020", available from Mouser. Parts Express seems to be brain-dead, they only carry the 0.032" size. Read the comments below the part listi .......
162: Dale and Riedon resistors (0.00)
Posted by djk on 2013-06-30, 01:30:55 (63.152.99.225)
A couple of points (in no specific order). The aluminum housing is to get good heat transfer to a heatsink. A 50W rated unit requires about 300 in^2 to use its full 50W rating, and that is with a rise .......
163: RE: Modifying the Paradigm Atoms (0.00)
Posted by djk on 2013-06-29, 21:10:57 (63.152.99.225)
There may be a 2.2µF electrolytic with a 2.7Ω resistor feeding the tweeter. Replacing with a good film cap will increase definition and detail, it may also make the tweeter a bit louder too. For .......
164: What part of (0.00)
Posted by djk on 2013-06-17, 01:51:10 (63.152.104.141)
What part of "I know, they chop the audio at very high frequency so they can use a tiny output transformer." didn't you understand? .......
165: RE: KEF (0.00)
Posted by djk on 2013-06-15, 23:39:36 (63.152.104.141)
I know, they chop the audio at very high frequency so they can use a tiny output transformer. I have a friend that owns the 100W Berning, the one with the switch-mode supply. It's a nice amplifier. :: .......
166: RE: KEF (0.00)
Posted by djk on 2013-06-15, 16:13:17 (63.152.104.141)
Berning makes a couple. .......
167: RE: JBL TS6000 (0.00)
Posted by djk on 2013-06-14, 12:22:47 (63.152.104.141)
. .......
168: third-order high-pass transfer function (0.00)
Posted by djk on 2013-06-08, 01:21:16 (63.152.104.141)
The first order tweeter filter plus the second order roll-off of the Audax tweeter would have given it a third-order high-pass transfer function. There was a notch filter for the tweeter impedance pea .......
169: RE: L400................not ! (0.00)
Posted by djk on 2013-06-08, 00:57:24 (63.152.104.141)
Your opinion is worth nothing to me. The fact is that a 4" drive makes an inadequate midrange, they won't even keep up in a low efficiency speaker crossed at 400hz (like some of the Thiel designs). I .......
170: L400................not ! (0.00)
Posted by djk on 2013-06-07, 00:08:01 (63.152.104.141)
L400s were very nice with a sub. A 4" is not even a good midrange, much less a bass-midrange driver like the 6-1/2" driver in the ADS. .......
171: RE: DBX 223 (0.00)
Posted by djk on 2013-05-25, 15:39:53 (71.221.252.209)
No schematic, it's hard to say. Price seems high for what is on offer. Do you need the extra features? If so, it may be OK for you. .......
172: FF issues (0.00)
Posted by djk on 2013-05-25, 01:02:40 (71.221.252.209)
Without knowing the base oil in the KEF tweeters there could be an adhesive compatibility issue down the road. I did as suggested on another brand of tweeter and the adhesive holding the voice-coil fo .......
173: DBX 223 (0.00)
Posted by djk on 2013-05-25, 00:55:39 (71.221.252.209)
The DBX uses a bi-fet opamp for the input. While they have chosen a 26.6K input impedance, you can change it to any value you like (and make it just like the ESP crossover input). The stock DBX could .......
174: RE: Finally found EIA code, "Hokutone"? (0.00)
Posted by djk on 2013-05-16, 00:51:48 (71.221.252.209)
I sincerely doubt it was Hokutone, the metal work on the bumped back-plate is not what you would see on a Hokutone driver. Those date back 40 years, and not many companies would like to glue rubber su .......
175: This should finish it off for you ! (0.00)
Posted by djk on 2013-05-16, 00:09:38 (71.221.252.209)
Click on the link first, then visit the main site. http://www.adamjhill.com/publications.html .......
176: RE: The dipole subwoofer-How does it works (0.00)
Posted by djk on 2013-05-14, 08:06:11 (71.221.252.209)
. .......
177: RE: Help identify driver (Jennings Research Contrara) (0.00)
Posted by djk on 2013-05-14, 08:01:15 (71.221.252.209)
It could be a Gefco driver. The pictures are not in the best focus, and there should be some more numbers on the frame somewhere. There used to be a huge number of driver manufacturers in the Midwest, .......
178: RE: Possibly alot..... (0.00)
Posted by djk on 2013-05-13, 12:01:50 (71.221.252.209)
You could pick up another 3dB in the 40hz region by doubling the box size. It will have lower power handling, It will have more intermodulation distortion, It will not have the same transient response .......
179: DCR ? (0.00)
Posted by djk on 2013-04-24, 00:51:40 (63.152.93.252)
The best inductor is the one that has the same DCR as the original. If the original is air core, don't replace it. If it's an iron core, you could replace it with an air core with the same DCR and ind .......
180: Receiver ? (0.00)
Posted by djk on 2013-04-24, 00:42:14 (63.152.93.252)
Have you verified the receiver with another set of speakers? Have you checked the KEFs with a meter? I've seen the input terminals on various brands of speakers oxidize to the point that they don't wo .......
181: RE: Do I really need a tweeter? (0.00)
Posted by djk on 2013-04-19, 02:58:57 (63.152.93.252)
You probably want an 8" full-range driver. .......
182: RE: Time and Phase alignment (0.00)
Posted by djk on 2013-04-13, 21:33:40 (63.152.93.252)
I did a 2441/2380 project years ago, I found the horn/driver combo needed to be crossed at 650hz to avoid sounding strained. I don't know what to tell you other than to try it and see what happens. I .......
183: Maybe ? (0.00)
Posted by djk on 2013-04-13, 20:56:46 (63.152.93.252)
If a three-way, not really, if a two-way, probably. I would add felt or foam around the woofer to reduce the diffraction caused by the 'proud' mounting. .......
184: RE: Ummmm, the 420s sounded "okay"... (0.00)
Posted by djk on 2013-04-13, 01:22:28 (63.152.93.252)
I preferred the L400s, and LV1020s. The L400s with a sub and an electronic crossover would really go to town. The L300s weren't bad for what they were. .......
185: RE: Time and Phase alignment (0.00)
Posted by djk on 2013-04-11, 00:58:46 (63.152.93.252)
I used this for PA over 30 years ago. The HF was a JBL 2440, the LF was four 15s in small folded horns, the filler was a dual 12 in a large MantaRay style horn. The crossover was at 500hz, 12dB passiv .......
186: RE: Time and Phase alignment (0.00)
Posted by djk on 2013-04-10, 02:52:56 (63.152.93.252)
"Second order and third order crossovers are not phase aligned and cannot be made transient accurate with a constant time delay." I am giving a link to the patent but the article in JAES is much bette .......
187: 4345 is -6dB at 32hz (0.00)
Posted by djk on 2013-03-31, 23:25:20 (63.152.93.252)
The 2245 woofer can be designed to go as low as 20hz with EQ, the B460 subwoofer being an example. 12 cu ft = 20hz, 8 cu ft = 26hz, both with 6th order EQ. .......
188: JBL 4345 (0.00)
Posted by djk on 2013-03-30, 04:18:39 (63.152.93.252)
. .......
189: The crossover is made from the highest quality parts (0.00)
Posted by djk on 2013-03-26, 13:10:49 (63.152.93.252)
The Sensible Sound, Nov/96 The woofer and tweeter together do a dance that I've found in only a few expensive speakers like the ProAc Response 1s and a couple of Totem models: they produce sound far i .......
190: RE: bass rumble tone from tanoy dc200? (0.00)
Posted by djk on 2013-03-11, 03:31:29 (63.152.93.252)
Turntable? .......
191: RE: What does that mean? (0.00)
Posted by djk on 2013-03-11, 03:27:49 (63.152.93.252)
I've sold many brands and heard many others. They all have deficiencies I couldn't live with. .......
192: What does that mean? (0.00)
Posted by djk on 2013-03-10, 22:27:06 (63.152.93.252)
What does that mean? Poor HF dispersion? Limited bandwidth? Limited dynamic range? .......
193: RE: anyone have experience with tube amps on the clues? (0.00)
Posted by djk on 2013-03-05, 18:15:54 (205.175.225.22)
Well, being that they're 4Ω and on a tube amp they would be 84dB/W/1M (if they meet spec), then I would suggest something 35W/ch or larger. .......
194: RE: No, Walls (0.00)
Posted by djk on 2013-03-05, 03:14:12 (63.152.93.252)
Wall placement would gain nothing, the No% calculations are based on 2Pi, which means in the middle of a floor or wall. The difference in cabinet volume from 2 cu ft to 0.4 cu ft box works out to 7dB .......
195: Smoke and Mirrors ? (0.00)
Posted by djk on 2013-03-04, 03:39:26 (63.152.93.252)
0.4 cu ft, 87dB, 28hz~33hz. A 2 cu ft 2nd order sealed box with an F3 of 30hz can only be 0.18% efficient (84.55dB). A 2 cu ft 4th order vented box with an F3 of 30hz can only be 0.36% efficient (87.5 .......
196: cut-away diagram (0.00)
Posted by djk on 2013-02-20, 23:25:18 (63.152.93.252)
As we can see from the cut-away diagram, the three screws allow the removal of the sub-enclosure for the midrange/treble unit, at which point the driver unit will come out through the front of the cab .......
197: RE: Birds of a feather (0.00)
Posted by djk on 2013-02-16, 16:25:47 (63.152.93.252)
A 6.5" makes an adequate midrange from about 150hz~2.5Khz or so (and no more than about 92dB). I liked the 99dB Audax 6.5" midrange, had to cross them at at least 400hz though. .......
198: A 4.5" driver is not a woofer. (0.00)
Posted by djk on 2013-02-13, 00:11:22 (63.152.93.252)
There was a time where 5th graders had better communication skills than this. VO is a standard mp3, with a variable bit rate ("vbr"), produced by the "lame" encoding engine. Wonder how far down the S .......
199: RE: Is that how the old "Presence" control worked in receivers of old? n/t (0.00)
Posted by djk on 2013-02-12, 04:56:06 (63.152.93.252)
Hmmm, not sure what you mean. McIntosh and Yamaha electronics had variable loudness compensation, basically a midrange cut circuit. Yamaha had a midrange presence control on some of their models that .......
200: Simple (0.00)
Posted by djk on 2013-02-10, 14:23:55 (63.152.93.252)
It would be so simple to make a 3.15Khz LCR bandpass filter with an on-off-on toggle switch. The middle position for 3dB of attenuation, to one side for 1.5dB of attenuation, to the other side for fla .......
Found 200 records in High Efficiency Speaker Asylum.
1: 35 years (0.00)
Posted by djk on 2018-01-14, 14:18:12 (207.191.195.70)
I've known Fred for over 35 years,I sold him some drivers I got from Bruce Edgar, Fred's the real deal. .......
2: PIO (0.00)
Posted by djk on 2018-01-08, 15:32:45 (199.188.65.49)
PIO caps sound very good. It would be a good idea to measure the ESR of the cap (not just the value). If the ESR is greater than about 0.5R think about a replacement. If it smells like dead fish, it's .......
3: RE: Source Impedance (0.00)
Posted by djk on 2017-11-15, 15:33:31 (199.188.65.49)
"Do you mean a grid choke instead of a grid resistor?" Yes. "If so, why would that lower the source impedance?" It should lower the DC resistance that is causing 1/F noise. "Good grid chokes will repr .......
4: Source Impedance (0.00)
Posted by djk on 2017-11-14, 16:13:21 (199.188.65.49)
If you add an input choke (instead of using a grid-leak resistor) it will lower the source impedance, this could lower the noise by 10dB (or more). .......
5: Altec (0.00)
Posted by djk on 2017-11-13, 15:01:54 (199.188.65.49)
I owned the A7-500, and was a Tannoy dealer. The Altec had better midrange, was more efficient, and did not have surround issues. The Tannoy Cheviot sounded better than the 15" models, the 10" models .......
6: RE: Help with TDM active crossover (0.00)
Posted by djk on 2017-11-07, 16:26:32 (199.188.65.49)
http://tdm-design.com/ https://web.archive.org/web/20060104185857/http://www.tdm-design.com:80/technical/cx2schver3.pdf https://web.archive.org/web/20030419131156/http://tdm-design.com:80/technical/te .......
7: RE: smallish jbl bi radial horns - desi (0.00)
Posted by djk on 2017-11-03, 14:41:05 (199.188.65.49)
2342 .......
8: RE: Help-old JBL d140f xmax specs?? Need a little info (0.00)
Posted by djk on 2017-09-30, 13:11:58 (199.188.65.49)
"IIRC, it's an underhung magnet" The E/K145 and 2215 are, the 140/130 are not. http://www.audioheritage.org/images/jbl/photos/drivers/140f.jpg .......
9: Crown, Phase Linear, BGW, Peavey (class AB+B) (0.00)
Posted by djk on 2017-09-26, 16:44:54 (199.188.65.49)
The drivers stages run class AB, with NO bias in the output stage. .......
10: RE: Yamaha JA-6681b questions (0.00)
Posted by djk on 2017-09-26, 15:47:33 (199.188.65.49)
"Metal diaphragms tend to stress crack, especially around the edges" The Yamaha has BeCu fingers that don't generally crack. By all means, replace the old foam. .......
11: Self Noise (0.00)
Posted by djk on 2017-09-12, 14:22:45 (199.188.65.49)
The self noise levels were quite high. The JAES tested one such horn, and while the distortion was low (less than 3%), the self noise level (no signal in) was over 100dB. .......
12: -18dB (0.00)
Posted by djk on 2017-08-31, 14:51:49 (199.188.65.49)
Should be fine, as long as you don't mind it being about 18dB down at 20Khz. .......
13: RE: do Selenium D250X diaphragms have centering dowels? (nt) (0.00)
Posted by djk on 2017-08-17, 16:55:28 (199.188.65.49)
You might have to file the rim to get it to move. .......
14: RE: do Selenium D250X diaphragms have centering dowels? (nt) (0.00)
Posted by djk on 2017-08-17, 16:33:07 (199.188.65.49)
It's rim centered. You might have to take a file to it (and then tap) if not aligned properly. .......
15: RE: do Selenium D250X diaphragms have centering dowels? (nt) (0.00)
Posted by djk on 2017-08-17, 14:17:27 (199.188.65.49)
. .......
16: Pro-Core 2 (0.00)
Posted by djk on 2017-08-03, 14:01:11 (199.188.65.49)
Pro-Core 2 looks real good for speaker cabinets. (two layers of MDF wrapped around a 3-ply plywood core, with plywood banding and then veneer faces) "Pro-Core MDF Core Pro-Core MDF uses MDF crossbands .......
17: top plate ? (0.00)
Posted by djk on 2017-06-27, 17:13:22 (199.188.65.49)
Is the top plate silver or gold toned? Gold toned top plates need to be replaced at JBL before they can be re-coned. .......
18: RE: jbl d130 in a5 cabinet (0.00)
Posted by djk on 2017-06-24, 13:08:53 (199.188.65.49)
You may need to change the bolt-circle, and you will need a spacer (or gasket). .......
19: NLA (0.00)
Posted by djk on 2017-06-14, 15:47:47 (199.188.65.49)
While the Bakelite throat in the JBL 375/2440/2441/2482 is replaceable, the part is NLA from JBL. .......
20: RE: Beyma sm115/k as sub (0.00)
Posted by djk on 2017-06-09, 12:17:02 (199.188.65.49)
"Am I reading this right: 27 cubic feet ?" Yes, that's why I have installed large loudspeakers in another room, behind walls, etc (there is no such thing as a free lunch). "I will have to admit, a "ta .......
21: RE: Beyma sm115/k as sub (0.00)
Posted by djk on 2017-06-08, 16:06:13 (199.188.65.49)
A tapped horn in not actually horn-loaded in the bottom octave, it's a sort of tapered transmission line. It looks (in sims) to be a very good choice for a driver like yours for high efficiency deep b .......
22: RE: Beyma sm115/k as sub (0.00)
Posted by djk on 2017-06-07, 15:59:17 (199.188.65.49)
If you expect it to go much below 40hz, consider a tapped horn design. .......
23: RE: Analog ? (0.00)
Posted by djk on 2017-06-06, 16:44:32 (199.188.65.49)
" I guess I'd be curious if there is a bump at 150 Hz out in a free field" A simulation of a LaSala type box with two different drivers, both showing peaking around 140hz or so. .......
24: RE: Analog ? (0.00)
Posted by djk on 2017-06-04, 14:35:37 (207.191.195.70)
Matters nothing what latency the crossover has, he is talking about adding an EQ into the low-pass output, and if it's digital it will have its own latency issue. .......
25: Analog ? (0.00)
Posted by djk on 2017-06-03, 13:23:25 (199.188.65.49)
Analog or digital EQ? I used to do just that with an analog EQ that sounded a bit noisy and opaque in full-range use. Digital will have some latency issues (delay) to deal with. .......
26: Foam ? (0.00)
Posted by djk on 2017-05-20, 13:12:08 (199.188.65.49)
At some point you might try a small block of acoustic foam in the bend of the horn. This is something Myer Sound did in their bent-horn monitor, and may have been the genesis for the Geddes foam-in-th .......
27: RE: Poor man´s WE/Altec 755 (0.00)
Posted by djk on 2017-05-11, 17:32:52 (199.188.65.49)
http://www.commonsenseaudio.com/an8cfspecs.jpg .......
28: AL4 (0.00)
Posted by djk on 2017-03-20, 14:26:33 (199.188.65.49)
Current LaScala network. .......
29: AK5 (0.00)
Posted by djk on 2017-03-20, 14:21:37 (199.188.65.49)
Current Klipschorn network. .......
30: GE Pyranol PIO = PCB's (0.00)
Posted by djk on 2017-03-19, 12:23:27 (207.191.195.70)
I. Background and Procedural History "Pyranol" is an insulating material once used extensively in electric equipment. Made from polychlorinated biphenyls ("PCBs"), Pyranol was prized for its dielectri .......
31: NDCR (0.00)
Posted by djk on 2017-02-27, 15:16:12 (199.188.65.49)
40 years ago Yamaha used the NDCR (noise distortion clearance range)to measure it's receivers at low volume settings. Yamaha CR-1020, NDCR (IHF-A) : for 0,1% into 8Ohm 20Hz to 20Khz from 100mW to 70W .......
32: RE: Once upon a time... (0.00)
Posted by djk on 2017-02-06, 13:57:10 (207.191.195.70)
".didn't Dayton Wright enclose one model of their high power electrostats in a bag filled with SF6 (sulphur hexaflouride)? " Yep. " I also recall that those speakers were quite problem prone due in pa .......
33: 24ga zip cord was factory on the STR (nt) (0.00)
Posted by djk on 2017-02-04, 14:49:56 (199.188.65.49)
. .......
34: RE: Finally aquired some Frazier "Dixielanders" (0.00)
Posted by djk on 2017-02-04, 14:47:47 (199.188.65.49)
Quam (270) were usually silver/grey, Oaktron (918)and MISCO were frequently blue. Is there an EIA code on the frame? .......
35: +1 (nt) (0.00)
Posted by djk on 2017-02-04, 14:38:10 (199.188.65.49)
. .......
36: SF6 (0.00)
Posted by djk on 2017-02-04, 14:36:25 (199.188.65.49)
Mount the drivers in a bag filled with SF6, a heavier-than-air gas available at a welding supply store. They won't corrode and loses their HF response. .......
37: RE: New Klipsch Forte III Best of CES 2017 (0.00)
Posted by djk on 2017-01-10, 14:16:34 (199.188.65.49)
I've not heard cones in the mids sound as good as the big new horns (as in the new Forte). .......
38: RE: $3800 ? (0.00)
Posted by djk on 2017-01-08, 12:33:13 (207.191.195.70)
I found Klipsch also offers a $3600 version, and that they increased the dealer mark-up from when I was a dealer .......
39: RE: Cheap PRV paging driver on 3 little horns (0.00)
Posted by djk on 2017-01-07, 11:19:52 (199.188.65.49)
Looks pretty grim, how does it sound? .......
40: $3800 ? (0.00)
Posted by djk on 2017-01-07, 11:19:08 (199.188.65.49)
Is that reasonable? (I like them, but remember when the MSRP was $1085/pair) .......
41: RE: xover from small midbass to SAHF w. 511 or Gollehon midhorn ? (0.00)
Posted by djk on 2017-01-04, 12:59:16 (199.188.65.49)
The Gollehon was a nice horn with a K55V on it, crossed to the KSN1016A. I crossed it to the Electro-Voice Regency enclosure with a custom Eminence woofer (cone similar to the EV15B). Measured flatter .......
42: RE: A7 VOTT advice. (0.00)
Posted by djk on 2016-12-20, 15:32:18 (199.188.65.49)
Label cannot be read. Could be 802, 808, 804, etc. .......
43: RE: Simple passive xxover for Eminence Beta 10 CBMRA ? (0.00)
Posted by djk on 2016-10-21, 14:04:34 (199.188.65.49)
Art Welter has, he also has a video of how it sounds (very good). .......
44: RE: Is this the AL kit you are referencing? (0.00)
Posted by djk on 2016-10-17, 16:26:42 (199.188.65.49)
The AL networks can be overhauled and updated to a better design for less than the cost of a whole new network. .......
45: RE: What version are they - crappy pic (0.00)
Posted by djk on 2016-10-14, 13:00:58 (199.188.65.49)
That vintage generally had the less desirable AL networks. If all the drivers are OK, I would guess around $800~$1000 a pair. I would suggest they refurbish them (not replace them). Warning: Churches .......
46: RE: La Scala speaker surround durability (0.00)
Posted by djk on 2016-10-13, 14:49:32 (199.188.65.49)
As long as they have not been flogged, they should last forever. Early 70's vintage used mylar caps, replace them. .......
47: Celestion (0.00)
Posted by djk on 2016-10-11, 13:42:05 (199.188.65.49)
Some of the Celestion drivers have such short threaded sections they will not work on some horns (leaves a cavity at the throat). Many drivers have 0.7" exits, causing distortion below 1Khz under high .......
48: ? (0.00)
Posted by djk on 2016-09-29, 16:44:03 (207.191.195.70)
I don't see any values. .......
49: Right Track (0.00)
Posted by djk on 2016-09-15, 16:22:25 (199.188.65.49)
I think you are on the right track using the AK3 low pass section. I would try for a lower DCR though, the stock woofer is only 3.2Ω DCR, so insertion loss from the woofer inductor adds up quickly. :: .......
50: ...and they are time-aligned. (0.00)
Posted by djk on 2016-08-17, 15:24:04 (199.188.65.49)
"1) a 1st order network allows for a correct phase transition between drivers. " Sure, if both drivers are dead flat for two and a half octaves on either side of the crossover point, and they are time .......
51: RE: screw size for Klipsch heritage network terminal blocks? (0.00)
Posted by djk on 2016-08-11, 15:37:13 (199.188.65.49)
IIRC, 6-32, about 1/4" long. .......
52: RE: problem with first order network (0.00)
Posted by djk on 2016-08-08, 17:40:34 (199.188.65.49)
ALK uses a very small woofer inductor. Use 2.5mH and a 128µF capacitor. (as used in many AK and AL networks) .......
53: 5-40 (0.00)
Posted by djk on 2016-07-29, 16:18:11 (205.175.226.102)
IIRC, it's a 5-40 screw. .......
54: RE: supertweeter for a Fostex 166en fullrange? (0.00)
Posted by djk on 2016-07-28, 18:44:25 (205.175.226.98)
. .......
55: JBL spec sheet 6.5Ω ±10% (0.00)
Posted by djk on 2016-07-20, 23:07:54 (205.175.226.100)
6.5Ω ±10% .......
56: Common Core (0.00)
Posted by djk on 2016-06-22, 23:45:45 (205.175.226.97)
You need a common core on the autoformer, otherwise it will simulate the HF rolling off. .......
57: RE: directional line arrays are able reduce their length (0.00)
Posted by djk on 2016-06-13, 13:48:50 (205.175.226.99)
+1 Point source horns over line arrays. .......
58: RE: How does loudness fall with distance from speaker? (0.00)
Posted by djk on 2016-06-10, 23:01:18 (205.175.226.99)
" I believe." hahax (I think not) .......
59: Critical distance ? (0.00)
Posted by djk on 2016-06-10, 17:43:30 (205.175.226.99)
For most rooms the transition point is less than 20 foot. .......
60: RE: Slot loaded open baffle bass (0.00)
Posted by djk on 2016-05-24, 23:08:05 (205.175.226.99)
"Does the high Q driver requirement still stand when using a 15" (or a 12") driver?" Yes "Does the 1/3 slot loading change this driver requirement in any way?" No Try it as a PPSL for lower distortion .......
61: RE: size problem ? (0.00)
Posted by djk on 2016-04-02, 12:39:29 (199.188.65.49)
Sorry, not sure about the Belle. The motor board is wider than the LaScala, but I have never tried it. A PPSL quad 8 plenum does fit though. .......
62: No Bass ! (0.00)
Posted by djk on 2016-04-02, 12:34:25 (199.188.65.49)
64hz horn. .......
63: size problem ? (0.00)
Posted by djk on 2016-04-01, 22:41:28 (205.175.226.99)
The Altec woofers are only a size problem in the LaScala (or Cornwall). .......
64: Are you sure? (0.00)
Posted by djk on 2016-03-23, 16:38:02 (199.188.65.49)
1975-1979 K-33-E (Eminence) and the K-33-B were used interchangeably. The records are not specific about the actual start date for the K-33-E but it is believed to be in the early to mid 1970's 1979 .......
65: RE: Inlow Sound's 130 Hz midbass horn (0.00)
Posted by djk on 2016-03-23, 16:32:52 (199.188.65.49)
"With the dual 12" bulk size at 16 cubic foot" It's much smaller than that, IIRC only about half that bulk. .......
66: RE: Inlow Sound's 130 Hz midbass horn (0.00)
Posted by djk on 2016-03-17, 16:48:47 (199.188.65.49)
Yes, with quad SEAS 8's. It sounds quite good, much better than the standard 15 in the vented LaScala cabinet. The bull-nosed horn was next, it has the same basic size as the Belle. I tried the Silver .......
67: RE: Inlow Sound's 130 Hz midbass horn (0.00)
Posted by djk on 2016-03-16, 18:29:04 (199.188.65.49)
The upper limit is the depth of the plenum. I have a new idea which will eliminate this issue, but I have not tested it. It involves a bifurcated horn throat (like a LaScala) with only a single smooth .......
68: RE: Inlow Sound's 130 Hz midbass horn (0.00)
Posted by djk on 2016-03-15, 22:12:13 (205.175.226.96)
The second (large) driver allows the horn to be much shorter for the 90hz cut-off. A single 8 would be fine if size were not an issue. I first built a double 12 horn in 1981, it sounded incredible (co .......
69: RE: Inlow Sound's 130 Hz midbass horn (0.00)
Posted by djk on 2016-03-15, 17:46:12 (199.188.65.49)
A pair of 12's in a compact horn with good mid response, use-able from 90hz to beyond 800hz or so. Very low distortion due to the initial conical expansion. .......
70: RE: Fostex r100t (0.00)
Posted by djk on 2016-02-10, 19:43:28 (205.175.226.101)
Are you trying to be offensive? .......
71: RE: Fostex r100t (0.00)
Posted by djk on 2016-02-10, 13:36:39 (205.175.226.101)
Yes, my friends were laughing too, until I demonstrated it (and they had borrowed my 1/2" B&K for their measurements). What levels can you resolve? (the steeper the crossover, the closer the level mat .......
72: RE: Follow up on my previous post... (0.00)
Posted by djk on 2016-02-09, 13:16:18 (205.175.226.98)
The stock T2A I measured was about 35mH from top to bottom (spec is 40mH), the universal replacement is similar. (I own a pair of the Crites units) .......
73: RE: Fostex r100t (0.00)
Posted by djk on 2016-02-09, 13:12:59 (205.175.226.98)
I find the levels must match within ±0.25dB to sound anywhere coherent, but I can hear a difference at ±0.1dB . .......
74: RE: Mass Corner (0.00)
Posted by djk on 2016-02-05, 22:35:39 (205.175.226.96)
Can't see the point? CSS makes a 12" version of the same driver. RCA made a 2" entry horn with an 80" mouth that had a 30hz taper rate, IIRC it was more than 12' deep. .......
75: Mass Corner (0.00)
Posted by djk on 2016-02-04, 22:43:51 (205.175.226.96)
Maybe for midrange, but not so much for maximum bass output. In general, for a bass horn we want the mass corner to be no higher than the crossover point we want to use. The lower the mass corner, the .......
76: RE: Recharging alnico (0.00)
Posted by djk on 2016-01-28, 22:33:29 (205.175.226.96)
I mentioned nothing about recharging, but since you bring it up............ Only a fool would not have a dropped Alnico compression driver re-charged. .......
77: RE: True scale (0.00)
Posted by djk on 2016-01-27, 18:17:42 (205.175.226.98)
I skidded them, lifted up one end on top of the bottom one, moved to the end on the ground, picked it up, and then slid it on top of the first one. Of course this was more than 30 years ago, and I am .......
78: RE: True scale (0.00)
Posted by djk on 2016-01-27, 13:30:41 (205.175.226.98)
Without the HF horn they are only 80" tall. I stacked the pair in my garage one time (horizontal placement), by myself. While big, they aren't all that heavy. .......
79: Bl (0.00)
Posted by djk on 2016-01-22, 22:49:11 (205.175.226.96)
The 416Z is 16Ω, so the Bl should be 1.414 times the 8Ω version. .......
80: Fine (0.00)
Posted by djk on 2016-01-15, 23:15:00 (205.175.226.101)
Series II or III will sound fine at that distance. You will want to tip them back and toe them in to aim the horns at your face. A pair of Forte would be fine too. .......
81: RE: Christmas concert with nice PA (0.00)
Posted by djk on 2015-12-22, 22:55:27 (205.175.226.96)
" 3.3' tall, 3' deep, 2.3' wide, " "dual 12 from 150-1200 (I think) but a bit too much for home. " But mine use current (and far less expensive 12PE32) drivers, are easy to build, and are only 3'4" ta .......
82: RE: how to specify LB76 tapped air core 0.8mH inductor? (0.00)
Posted by djk on 2015-12-14, 23:00:46 (205.175.226.101)
Just use the 4R and 8R taps of a 20W~40W 25V or 70V transformer. .......
83: RE: EV 1829 drivers - plug the back? (0.00)
Posted by djk on 2015-12-08, 23:14:36 (205.175.226.101)
"The best cheap 1" horn is probably the Community SRH 90.I made a system using this horn with an EV 1829 paging horn driver and it was +/- 1dB from 500hz ~ 6.3khz,add a tweeter and you are done." EQ w .......
84: RE: Can't find anything on it.... (0.00)
Posted by djk on 2015-11-24, 22:46:38 (205.175.226.102)
https://images.search.yahoo.com/yhs/search;_ylt=AwrTcYBmWVVWQoIAqW8unIlQ;_ylu=X3oDMTBsZ29xY3ZzBHNlYwNzZWFyY2gEc2xrA2J1dHRvbg--;_ylc=X1MDMTM1MTE5NTY5NARfcgMyBGJjawM1Y3E2b3A1YXA3M3ZqJTI2YiUzRDMlMjZzJTNE .......
85: RE: he horn fun under $750 (0.00)
Posted by djk on 2015-11-23, 22:58:17 (205.175.226.97)
"What are they ?" First Octave Audio. .......
86: RE: Bad News (0.00)
Posted by djk on 2015-11-05, 17:39:43 (205.175.226.97)
Wash with TSP, prime with Kills, then repaint. .......
87: Yes, (0.00)
Posted by djk on 2015-11-03, 23:17:15 (205.175.226.99)
Yes, more like 93dB for its actual impedance. .......
88: SB Acoustics (0.00)
Posted by djk on 2015-11-03, 16:53:41 (205.175.226.100)
. .......
89: RE: It's about LF fidelity (0.00)
Posted by djk on 2015-10-16, 23:48:34 (205.175.226.102)
"PPSL and other direct radiating designs all suffer from the effects of moving mass and nonlinear motor/compliance suspension that horn-loaded bass bins don't. This is especially true when playing bac .......
90: RE: Inductor? (0.00)
Posted by djk on 2015-10-15, 15:33:36 (205.175.226.96)
The Heil is a nice tweeter, too bad it won't work in his application. The 100dB+ Beyma version would be fine (but $1200 a pair), any of those nice Fostex tweeters would be fine too. .......
91: RE: Inductor? (0.00)
Posted by djk on 2015-10-13, 23:19:43 (205.175.226.102)
The HF must be at least 6dB more efficient for this method to work. The parallel inductor works similar to the series cap, but without capacitor quality issues (it's usually easier to get a small good .......
92: Inductor? (0.00)
Posted by djk on 2015-10-12, 14:29:12 (205.175.226.96)
Since the Heil is more efficient, you may use an inductor in parallel with it, and a series resistor to match the level. You must use a series resistor for this method, at least 4R or so. .......
93: RE: Yes, but how? (0.00)
Posted by djk on 2015-10-08, 23:06:11 (205.175.226.96)
Radian can't help, the impedance changes on the horn. There will be several impedance peaks near where you want to cross, each one will need an LCR trap. .......
94: RE: How many horn speakers are truly "time/phase-coherent"? (0.00)
Posted by djk on 2015-10-07, 15:25:38 (205.175.226.101)
I know of no way to fix apparent-apex problems electronically. .......
95: RE: How many horn speakers are truly "time/phase-coherent"? (0.00)
Posted by djk on 2015-10-06, 13:37:54 (205.175.226.99)
But wouldn't it still have an off-axis problem (apparent apex)? .......
96: RE: Question (0.00)
Posted by djk on 2015-09-29, 01:14:07 (205.175.226.101)
I'm still drawing up the 27hz version, I have the 40hz 4th order version (for PA) done. .......
97: RE: Question (0.00)
Posted by djk on 2015-09-28, 23:36:27 (205.175.226.101)
Of course its a B6, useable to 300hz or so. PE 295-120. Quad version is same efficiency, but 8Ω. (cat not included) .......
98: RE: A 2 inch Cube ?..... Yes definitely, but is this science fiction?............nt (0.00)
Posted by djk on 2015-09-28, 23:33:14 (205.175.226.101)
Quad version, 45" tall. Dual version would be 24" tall. (cat not included) .......
99: RE: Question (0.00)
Posted by djk on 2015-09-28, 15:04:04 (205.175.226.101)
How small does he want? The Oris is what, 30" in diameter? How about a 2' cube flat to 27hz, 100dB/2.83V 1M, would that be small enough? .......
100: Di (0.00)
Posted by djk on 2015-09-25, 14:19:58 (205.175.226.96)
Which have the same Di at 500hz that an Altec 311-90 does. With an LR24 you can cross them lower than 800hz. .......
101: Picture (up close) (0.00)
Posted by djk on 2015-09-24, 14:22:39 (205.175.226.101)
. .......
102: RE: Altec or WE 32a 90* horn?. (0.00)
Posted by djk on 2015-09-22, 23:26:39 (205.175.226.98)
I didn't catch that. I would sell them and buy some of the newer less expensive Altec and pocket the difference (if you like that horn). They're OK (if you get them cheap enough). A friend is scrappin .......
103: RE: Altec or WE 32a 90* horn?. (0.00)
Posted by djk on 2015-09-22, 18:04:22 (205.175.226.98)
Buy the Altec and save your money. .......
104: RE: A 10" seems to be a sweet spot (0.00)
Posted by djk on 2015-09-22, 14:47:18 (205.175.226.100)
Yes, it looks real good. The 20hz design I posted could be revised for a higher cut-off and a smaller size. That XBL^2 woofer with its underhung design would be just the ticket for a powerful tapped h .......
105: 20hz TH design, 100dB/2.83V/1M (0.00)
Posted by djk on 2015-09-21, 18:06:23 (205.175.226.102)
.......
106: RE: JBL 2241H 18" Woofers (0.00)
Posted by djk on 2015-09-18, 23:45:53 (205.175.226.102)
"I'm not sure I have the space for two large subwoofers in this room..." The cabinet size of the TH is largely a function of how low you want it to go, and the Sd of the woofers. With the 18 the cabin .......
107: RE: flat to 100hz ? (0.00)
Posted by djk on 2015-09-08, 23:53:15 (205.175.226.97)
You will need to cut it down from the double plan. Remove the 1x4 front horn brace, and the motor board (part E) becomes 19". .......
108: RE: flat to 100hz ? (0.00)
Posted by djk on 2015-09-07, 19:52:16 (205.175.226.96)
"Is it right to assume that with 2 drivers per side the horn can be shorter?" Yes, to a certain extent. There is no such thing as a free lunch! My friends tell me the 1981 dual 12 models are the best .......
109: RE: flat to 100hz ? (0.00)
Posted by djk on 2015-09-06, 19:38:55 (205.175.226.102)
The GPA 515 would be OK in a big horn. The RCA sounds the best of the 100hz double 15 horns, Altec A4, JBL4550, RCA Ubangi. I would build any of these without ported big back volume. I designed an .......
110: 160hz (0.00)
Posted by djk on 2015-09-06, 19:27:29 (205.175.226.102)
The horn loading falls off below 160hz and the A5/A7. .......
111: RE: Altec 604 in Onken (0.00)
Posted by djk on 2015-08-28, 15:12:22 (205.175.226.102)
The 604/605 sound pretty good in the Electro-Voice Regency cabinet, a type of rear-loaded horn. .......
112: RE: Altec GPA recone kits (procedure inquiry) (0.00)
Posted by djk on 2015-08-20, 00:41:58 (205.175.226.98)
Shim the coil into the frame Glue in the spider Glue in the cone Attach the tinsel leads Remove the shim and test Attach the dustcap Watch a couple of videos first. .......
113: RE: aftermarket diaphragms for 1" Altec drivers ... (0.00)
Posted by djk on 2015-08-11, 18:02:21 (205.175.226.102)
Those may be one of the better clones. Made by Aton, a supplier for JBL (and others), parent company of P-Audio (OEM for many, including some Klipsch). .......
114: Used (0.00)
Posted by djk on 2015-08-02, 20:04:21 (205.175.226.102)
Considering you will need a new diaphragm, as well as paying shipping both ways to GPA for the repair, you may be better off buying a used one. .......
115: RE: Nice Midrange driver... (0.00)
Posted by djk on 2015-07-25, 20:26:16 (205.175.226.99)
Very similar to the Altec 288, but with BeCu fingers for the suspension. I have one sitting on the floor next to me. .......
116: RE: I found that the two are only... (0.00)
Posted by djk on 2015-07-24, 22:43:45 (205.175.226.100)
The Yamaha JA6681b is 35mm (1.4") throat, with 17,500 gauss. .......
117: RE: Need feedback/info on GPA 902 & Radian 475PB... (0.00)
Posted by djk on 2015-07-23, 00:18:33 (205.175.226.98)
Have they changed the way the voice-coil former is attached to the dome? I didn't think so. .......
118: RE: Short Studs (0.00)
Posted by djk on 2015-07-20, 22:02:41 (205.175.226.98)
I've got a bunch of JBL studs, 1/4-20 in 0.75" and 1.25" How many do you need? .......
119: RE: Need feedback/info on GPA 902 & Radian 475PB... (0.00)
Posted by djk on 2015-07-19, 22:53:47 (205.175.226.96)
I think the 902 may be a better driver than the 475. I do not like the way Radian attaches the Kapton former to the dome, the Nomex used in the Altex/GPA is much better. .......
120: Kustom (0.00)
Posted by djk on 2015-07-18, 00:03:59 (205.175.226.98)
These show up on eBay from time-to-time. Another shot on top of a A7/4560 type cabinet. http://i139.photobucket.com/albums/q319/hardwarev4/kuskat028.jpg .......
121: RE: Where the hell is djk? (0.00)
Posted by djk on 2015-07-12, 21:12:32 (205.175.226.98)
PPSL is a concept. I have plans and a cut-list on line for the 35hz PPSL with the Kappa Pro 15LF2. I have one friend that bult one and used the Yung SD500-6 500W Class D Subwoofer Plate Amplifier Modu .......
122: RE: PPSL (0.00)
Posted by djk on 2015-07-11, 19:53:56 (205.175.226.99)
"Maybe the 12" driver PPSL would be a better fit for 250hz? " Yes. EV made a dual 15 PPSL that was crossed at 800hz, but it got a little rough. Art Welter made some extensive measurements on a double .......
123: RE: Where the hell is djk? (0.00)
Posted by djk on 2015-07-10, 20:59:50 (205.175.226.101)
"but it's NOT a horn, and there are no free lunches, eh?" It can be time-aligned without DSP, goes deeper, is simpler to make. Oh, it will also have less distortion. In a side-by-side test, the PPSL a .......
124: RE: Where the hell is djk? (0.00)
Posted by djk on 2015-07-10, 01:17:44 (205.175.226.102)
"We should have been talking about PPSLs by now." I agree. I think a PPSL with a Danley Synergy mid-HF horn on top would be a good choice for high efficiency and reasonable size. A LaScala sized cabin .......
125: RE: altec 30166 throat adapter (0.00)
Posted by djk on 2015-06-28, 22:12:23 (205.175.226.99)
Sorry, I was wrong. I have one each 30162, 30210, and 30170. An aluminum pair sold for $350 in April, I hope you're not looking for the brass ones. .......
126: RE: anyone hear... (0.00)
Posted by djk on 2015-06-19, 23:56:52 (205.175.226.33)
Especially on the 2384 horn. .......
127: RE: Recommended amp for Voice of the Theater (VOTT) Speakers (0.00)
Posted by djk on 2015-06-08, 23:45:34 (205.175.226.34)
I owned a set of Altec A7-500 in 1972. Don't expect any real deep bass, or real extended HF, no matter what you do. Another issue is replacing those 40+ year old capacitors in the networks, ::: TOPIC: .......
128: Faux Box Joints (0.00)
Posted by djk on 2015-06-05, 15:06:15 (205.175.226.34)
Use butcher-block construction and stagger at the corners. Pay attention to the grain if not using quarter-sawn. Hit it with a belt-sander when the glue is cured. Solid, if a bit heavy. .......
129: RE: Help Needed (0.00)
Posted by djk on 2015-06-03, 01:33:10 (205.175.226.33)
28.3 is what I use. .......
130: RE: 50 years of drying? (0.00)
Posted by djk on 2015-06-03, 01:31:06 (205.175.226.33)
"I assume again, that you've never really looked at using real wood, " Been there, done that, won't do it again (gapped in the corners). I suppose it's possible, but most people are not going to use q .......
131: 50 years of drying? (0.00)
Posted by djk on 2015-06-02, 14:51:12 (205.175.226.38)
"Made from salvaged hardwood" 50 years of drying? Fine, but I still wouldn't suggest this to others. .......
132: Same One (0.00)
Posted by djk on 2015-05-31, 22:11:49 (205.175.226.37)
They have the same one I suggested (the one closest to the stock look), and you can buy direct from the source I listed. .......
133: $50? (0.00)
Posted by djk on 2015-05-31, 22:04:31 (205.175.226.37)
http://www.parts-express.com/pedocs/specs/294-2120-celestion-cdx1-1445-specifications.pdf http://www.parts-express.com/prv-audio-wg16-25-b-1-45-x-45-abs-elliptical-tractrix-waveguide-2-3-bolt--294-289 .......
134: Just a reminder.... (0.00)
Posted by djk on 2015-05-30, 23:27:16 (205.175.226.32)
Of how much space is available to mount a horn in the C34. .......
135: RE: I clicked on the link but where to buy it? (0.00)
Posted by djk on 2015-05-27, 14:18:41 (205.175.226.39)
Antique Electronic Supply .......
136: RE: where to buy grillecloth for altec laguna cabinets?? (0.00)
Posted by djk on 2015-05-27, 00:49:10 (205.175.226.34)
Closest I could find. .......
137: RE: Anyone know the difference in 803A & 803B Altec Woofers (0.00)
Posted by djk on 2015-05-24, 01:54:08 (205.175.226.33)
45hz vs 25hz Fs. .......
138: dual 12 tower (0.00)
Posted by djk on 2015-05-17, 21:25:20 (205.175.226.33)
"because it would be cool to have even a true 95 (or even 94) dB sensitivity tower" I used to build a dual 12 tower, 44" tall, 17" wide, 19" deep. It was 101dB/2.83V/1M (2W at 4R) in 2Pi. With a Q=2 h .......
139: RE: Maybe not (0.00)
Posted by djk on 2015-05-17, 21:15:25 (205.175.226.33)
"Are you really crossing a 15" woofer at 1.5kHz? Sorry, that's not hi-fi." So all the later Altec 604 are junk? .......
140: RE: Maybe not (0.00)
Posted by djk on 2015-05-17, 21:11:59 (205.175.226.33)
No, it's just a diffraction slot (basic physics). There was an article in the JAES many years ago, it's in the first speaker anthology. .......
141: 0.23dB (0.00)
Posted by djk on 2015-05-17, 21:09:36 (205.175.226.33)
"will this have a great influence on the loudness or sound quality ?" The difference will be about 0.23dB, inaudible. ((P1/P2)log)*10=dB difference. .......
142: RE: Maybe not (0.00)
Posted by djk on 2015-05-15, 15:12:58 (205.175.226.33)
Have you tried an aperture plate in front of the woofer? .......
143: RE: Don't understand the "circular horn throat to square horn mouth" (0.00)
Posted by djk on 2015-05-04, 14:55:27 (205.175.226.32)
" I don't get why Klipsch bothered to design the horn throat to be round," They did, for the parts that mattered. If they had brought it out to the front as circular they would have had a pinch (narro .......
144: RE: The 2015 Klipsch design is great value (0.00)
Posted by djk on 2015-05-03, 02:01:09 (205.175.226.37)
I have some JBL 2435HPL beryllium drivers, they sound incredible, much, much better than the titanium Klipsch uses. "the only difference is in dispersion " What you don't like wide dispersion? Horns h .......
145: RE: The 2015 Klipsch design is great value (0.00)
Posted by djk on 2015-05-02, 20:36:42 (205.175.226.37)
So, where did you find them for $1K a pair? Everywhere I found they were $1350. "The main issue is the lack of dispersion at only 90x90 degrees." So what do you think a 1" dome tweeter is at 16Khz? (t .......
146: 49.2dB (0.00)
Posted by djk on 2015-04-18, 21:47:10 (63.152.74.225)
1mW at 30, add 49.2dB to get 1W/1M. .......
147: HSU (0.00)
Posted by djk on 2015-04-17, 23:10:52 (205.175.226.38)
Dr. HSU designed the BIC speakers in the other post. These are a step up. "The HB-1 MK2's midrange is a real treat, for it is virtually without color and as close to neutral as I think I've heard at .......
148: beryllium (0.00)
Posted by djk on 2015-04-12, 00:51:05 (205.175.226.38)
Yes, the JBL 2435HPL is beryllium. They may be found on eBay for around $400 or so. The better the program material sounds, the better the beryllium sounds. Really poor program material can be almost .......
149: OSHA (0.00)
Posted by djk on 2015-04-07, 00:55:02 (205.175.226.38)
The dB police would shut down live acoustic music if they could. A friend of mine plays(acoustic)violin with a country band on weekends. He owns about five violins, and takes one that is most suited t .......
150: RE: I wonder... (0.00)
Posted by djk on 2015-04-06, 15:38:48 (205.175.226.38)
"I can, with a high degree of certainty, say that your friend has hearing damage." No, you can't. You have no idea of the listening distance, the spectral content, and the peak-to-average ratio. ::: T .......
151: RE: Out of all the systems.... (0.00)
Posted by djk on 2015-04-05, 23:15:14 (205.175.226.39)
EV HR90/DH7 on top, now replaced with JBL 2384/2435HPL on top. Nakamichi (stasis) amp on top, Crest on the bottom. .......
152: I wonder... (0.00)
Posted by djk on 2015-04-05, 23:06:17 (205.175.226.39)
A friend has some custom speakers that are 107dB/2.83V/1M. Most of the time he is listening to 100mW or so, the quality of the program material just isn't all that good. Two albums cause him to run hi .......
153: RE: found problem with 808-8A frequency response ... (0.00)
Posted by djk on 2015-03-19, 15:38:41 (205.175.226.34)
If you take off the top plate it will need to be remagnatized. .......
154: RE: Any one use a miniDSP with Altec 604's or in similiar higheff systems? (0.00)
Posted by djk on 2015-03-18, 18:02:02 (205.175.226.34)
Check over at Klipsch, many users over there. .......
155: RE: Belden (0.00)
Posted by djk on 2015-03-14, 18:57:39 (205.175.226.34)
Belden attributed the difference in CMRR to certain colors being microscopicly different in diameter, thus affecting the mutual coupling in the twist. The differnce was on the order of 2dB or so (IIRC .......
156: Belden (0.00)
Posted by djk on 2015-03-13, 23:08:40 (205.175.226.39)
"The latest I have seen is insulation color on wire being audible (watch how fast I get flamed for that!). " So Belden is wrong when they state that the CMRR of their twisted-pair wire differs with th .......
157: RE: Did anyone hear these horns? (0.00)
Posted by djk on 2015-03-10, 15:45:21 (205.175.226.32)
"I've had the 90 degree and 60 degree versions and like the 60s the best. I'd like to try the midbass with smaller driver but maybe this one is integral with the 2"." Same experience here. I'm to the .......
158: RE: Did anyone hear these horns? (0.00)
Posted by djk on 2015-03-09, 23:22:21 (205.175.226.38)
I am not fond of the HP940 HF horn. They sound a bit better than a JBL 2380 though. .......
159: RE: Memories of Patronis (0.00)
Posted by djk on 2015-03-08, 19:43:10 (205.175.226.32)
It would have been amazing to go to Georia Tech and take classes from Leach and Patronis. I had chance to talk with Leach a couple of times, but not Patronis. .......
160: RE: Anyone know what these EV midbass horns are? (0.00)
Posted by djk on 2015-03-07, 20:47:26 (205.175.226.33)
This guy had three complete horns from a cinema, now just the one (with no drivers). It was designed by Eugene T. Patronis (Georgia Tech)and was patented, United States Patent, 5,125,732 (June 30, 199 .......
161: RE: Digda said: (0.00)
Posted by djk on 2015-03-05, 15:23:41 (205.175.226.37)
Open tinsel lead? Had it happen before. .......
162: RE: Tough crossover question (maybe) (0.00)
Posted by djk on 2015-03-02, 22:49:08 (205.175.226.33)
You will need to change the value of every part in order for it to work properly. .......
163: RE: Tough crossover question (maybe) (0.00)
Posted by djk on 2015-03-02, 18:24:43 (205.175.226.19)
"For a 1st order crossover f=1/(2*pi*C*Z) so the frequency and impedance are related. For a 2nd order crossover f= 1/(2*pi*sqrt(L*C)) and so the frequency is independent of the impedance. However the .......
164: The Question (0.00)
Posted by djk on 2015-03-02, 15:23:18 (205.175.226.33)
The question you should be asking is has anybody measure the T/S parameters. The 12" version of that driver is so far off that the only thing it is suitable for is an OB system. .......
165: RE: Put that on top of these (0.00)
Posted by djk on 2015-02-20, 23:03:45 (205.175.226.39)
You need to order the LTH-142 horns to fit your EV drivers. The Faital Pro has a 1.4" entry with a four-bolt four-inch bolt circle. The Electro-Voice DH1012 is 36mm, 1.4" exit with a 3.5" bolt circle. .......
166: RE: You did say cost no object..., right? (0.00)
Posted by djk on 2015-02-18, 18:07:50 (205.175.226.39)
Man, that must have been a big theater! .......
167: RE: Edgarhorn Seismic Sub hums (0.00)
Posted by djk on 2015-02-17, 22:50:35 (205.175.226.39)
Check with Hsu, it's probably the main filter caps. A few years ago there was a rash of bad filter caps, computers, audio gear, etc., all were hit hard. .......
168: RE: Efficiency & Resistance (0.00)
Posted by djk on 2015-02-15, 19:34:16 (205.175.226.32)
A SS amplifier has distortion that declines as the impedance goes up. Klipsch did an Otala Distortion test using a Heresy as a load, the distortion dropped like a rock in the midrange as the impedance .......
169: RE: Efficiency & Resistance (0.00)
Posted by djk on 2015-02-14, 21:43:36 (205.175.226.38)
McIntosh MC2125/2120 DAMPING FACTOR in STEREO 16 at 2 ohms output, 50 at 4 ohms output, 20 at 8 ohms output, 14 at 16 ohms output. It would seem that this amplifier has its best performance at 4Ω .......
170: RE: Put that on top of these (0.00)
Posted by djk on 2015-02-14, 21:33:49 (205.175.226.38)
If the mids cqan gio to 1Khz I would consider this Faital Pro horn. .......
171: RE: Help With Small/Short Mid Horn for EVDH1012A (0.00)
Posted by djk on 2015-02-12, 23:57:41 (205.175.226.37)
The $59 elliptical Faital Pro LTH142 horn might do what he wants. He would need an adaptor made from a 1/8" aluminum plate to make the bolt circles line up. .......
172: RE: Help With Small/Short Mid Horn for EVDH1012A (0.00)
Posted by djk on 2015-02-12, 18:34:04 (205.175.226.37)
A 10" deep horn will be smooth above about 680hz. The EV HR90 sounds very good, and with the DH1012 may be crossed at 500hz(24dB/oct). It's overall depth is about 14", but the mounting depth is less t .......
173: RE: replacement speakers for community PA (0.00)
Posted by djk on 2015-02-02, 13:47:41 (205.175.226.37)
Hair-spray works well. .......
174: RE: replacement speakers for community PA (0.00)
Posted by djk on 2015-01-29, 15:18:57 (205.175.226.33)
The R2 is a horn bass, the $19 woofers will make noise, but not work properly. Ditto for the buyout woofers, they look like they are for a reflex design. The impedance of an R2 is 2.9Ω around 230 .......
175: RE: replacement speakers for community PA (0.00)
Posted by djk on 2015-01-28, 01:58:39 (205.175.226.19)
The HF diaphragm is a standard Eminence type. .......
176: RE: lmgtfy ... (0.00)
Posted by djk on 2015-01-24, 21:04:36 (205.175.226.19)
When pigs fly? The most efficient permanent magnet 15" driver ever made was the JBL 130/2220 series driver at No=8.7%, or 101.4dB Now while it will produce some ragged peaks in the upper midrange that .......
177: RE: Pioneer PAX-30g (0.00)
Posted by djk on 2015-01-23, 22:52:26 (205.175.226.19)
"The other thing that sticks out is thatg preamp and power amp need to be dialed down much more than the 4343's which I guess relates to the higher efficiency" How much louder would you guess? 5 or 6 .......
178: RE: lmgtfy ... (0.00)
Posted by djk on 2015-01-23, 15:22:56 (205.175.226.19)
It doesn't disclose the test method. My point was that the numbers they list are not possible. .......
179: RE: lmgtfy ... (0.00)
Posted by djk on 2015-01-22, 23:08:48 (205.175.226.39)
I might buy that 103dB at 1/2M, but never at 1M. Pyle used to publish their graphs for 1/2W at 1/2M, you just had to read the fine print(and subtract 3dB). .......
180: RE: David Navone (0.00)
Posted by djk on 2015-01-19, 23:09:23 (205.175.226.33)
The transformers are too small. .......
181: RE: Some Graphs (0.00)
Posted by djk on 2015-01-10, 22:02:41 (205.175.226.19)
Yeah, they look good don't they? I like EV, just bought another pair of DH1A, and a pair of EV15B the other day. .......
182: RE: Speaker-level to line-level converter (0.00)
Posted by djk on 2015-01-08, 01:17:51 (205.175.226.33)
A 2.2KΩ 1/2W resistor in series with a 100Ω 1/2W resistor will give about the correct attenuation (27dB). Parts from Mouser, Digi-Key, Radio Shack, etc. .......
183: RE: No negatives ? (0.00)
Posted by djk on 2015-01-07, 18:07:33 (205.175.226.34)
So, how do you deal with it? The stock autoformer doesn't have a 2dB adjustment. .......
184: RE: Does the Altec 604 design make sense? (0.00)
Posted by djk on 2015-01-06, 23:21:39 (205.175.226.33)
The Tannoy 10's sounded nasal, the 15's sounded dark, the 12's were the best. .......
185: Some Graphs (0.00)
Posted by djk on 2015-01-06, 22:45:05 (205.175.226.33)
This is the 18" version, no real bass. It's a vented box with a horn-port. No real HF up top, the DH1A has about 10dB more output in the top octave. .......
186: No negatives ? (0.00)
Posted by djk on 2015-01-06, 15:19:58 (205.175.226.37)
"No negatives" Other than attenuating the HF a whole bunch. .......
187: RE: EV 6615 bass horn (0.00)
Posted by djk on 2014-12-27, 21:14:33 (63.152.119.195)
Lame. .......
188: RE: Bigger can be better when its small (0.00)
Posted by djk on 2014-12-22, 15:54:51 (205.175.226.34)
Something like the LAB15 (or similar). .......
189: RE: Bigger can be better when its small (0.00)
Posted by djk on 2014-12-19, 15:31:42 (205.175.226.38)
RCA fan (Bill Woods) basic plan. .......
190: RE: Best 15" Horn Drivers (not for TH) (0.00)
Posted by djk on 2014-12-18, 23:41:04 (205.175.226.34)
.......
191: RE: AGAIN Why no rear and front HORN loaded MIDRANGE drivers in Pro sound ? (0.00)
Posted by djk on 2014-12-12, 23:59:47 (205.175.226.39)
"You admitedly have no experience with double loaded horns." I do, they sound poor. PWK (also) wrote about why they sounded bad, about 50 years ago. " In my example do you really think you will be abl .......
192: Myth ! (0.00)
Posted by djk on 2014-12-08, 18:17:31 (205.175.226.39)
Often repeated, but fact-free (not true). 1963 Paul Klipsch designs the La Scala speaker for the performing arts sector. Arkansas gubernatorial candidate Winthrop Rockefeller later uses it as a public .......
193: no midrange (0.00)
Posted by djk on 2014-12-02, 23:17:56 (205.175.226.38)
It's a no midrange crossover point for a 12. A 10.5" piston has roughly 90° conical dispersion around 1050hz, about 43° at 2.2Khz. .......
194: Klipsch Cornwall II (0.00)
Posted by djk on 2014-12-02, 23:16:09 (205.175.226.38)
Consider a used set of Klipsch Cornwall II (mid 80's and newer), replace the caps in the networks, and solder the connections at the drivers (only if you're good with an iron). .......
195: RCA fan ? (0.00)
Posted by djk on 2014-12-02, 23:04:20 (205.175.226.38)
Page Bill Woods and ask which products would be best for hi-fi. .......
196: RE: Not to be a HE party pooper, but... (0.00)
Posted by djk on 2014-12-01, 18:19:10 (205.175.226.19)
I would suggest building it half-height (30W x 20H x 24D)and cross it at 250hz and 1Khz or so. The 30 x 20 is the same size as the horn in the original Altec A7, but with a 12 it can go higher, and we .......
197: RE: crossovers? (0.00)
Posted by djk on 2014-11-29, 19:33:25 (63.152.63.21)
150hz and 1Khz. .......
198: RE: Compresion all the way. What midcabs? (0.00)
Posted by djk on 2014-11-26, 23:25:18 (205.175.226.39)
My brother made that set for a friend on mine, uses the B&C 12PE32. A set I made in 1981 for the same friend as above, they were a bit too large to haul abound. .......
199: RE: Not to be a HE party pooper, but... (0.00)
Posted by djk on 2014-11-25, 13:53:16 (205.175.226.34)
Sound better than the very expensive line array stuff. I replaced a 4 box per side line array with a single dual 12 horn load per side and more than doubled the distance for inteligibility in a large .......
200: RE: Looking for a wood turner (0.00)
Posted by djk on 2014-11-25, 00:21:03 (205.175.226.34)
Try Dave Haris, he made the kits that went into the bull-Nosed Horn I showed last month. Any shape, any size are possible. .......
Found 4 records in Planar Speaker Asylum.
1: Re: new review of VMPS planar hybrid (Positive Feedback Online) (0.00)
Posted by djk999 on 2004-12-16, 10:31:50 (63.113.196.170)
I don't believe the VMPS midrange is a true ribbon driver. It's similar in design to many planar drivers with etched conductive traces on a thin plastic or mylar diaphragm, sandwiched between two magn .......
2: Re: Tried the MGIIIA's as surrounds (0.00)
Posted by djk999 on 2004-10-28, 12:36:23 (63.113.196.170)
The problem with using a planar driver parallel to your side walls will be an acoustic cancellation at a frequency with a wavelength twice the distance from the wall. If you're out 10" then you're pro .......
3: Newform R645 for side surrounds? (0.00)
Posted by djk999 on 2004-10-28, 12:26:14 (63.113.196.170)
Is anyone using the R645's as side surround speakers? I'm wondering if their reported horizontal dispersion is real and well suited for a side application (as part of a 7.1 setup) which would need to .......
4: Is Soundline still around? (0.00)
Posted by djk999 on 2004-10-25, 11:37:37 (63.113.196.170)
Wondering if Soundline is still around. Since their old address www.Soundlineaudio.com isn't active and no one answers their phone I'm guessing they went under. Anyone know? Thanks .......
Found 1 records in Asylum Feedback/Support.
1: Ditto ! (nt) (0.00)
Posted by djk on 2006-06-08, 18:28:30 (205.175.225.5)
. .......
Found 11 records in Tubes Asylum.
1: Value of Used OS tubes - telfunken, tung-sol, hk (0.00)
Posted by djk33 on 2005-08-08, 16:46:51 (4.229.93.250)
I'm new to the world of tubes so I need help determining the value of some used old stock tubes which I inherited from my uncle. Most of the tubes were used in his 1960’s Harman Kardon and Heathkit tu .......
2: Re: NO - Zero Bias operation is not appropriate for SV811-3! (0.00)
Posted by djk on 2001-03-03, 01:17:11 (206.24.61.155)
You are right.I was thinking of an 811A.But I never suggested running the low-Mu 811-3 that way.I did say >>Look a(t) the curves and figure out what you need. >Then again, the 20mA you quote is valid .......
3: Re: Bias point for SV811-3 in PP configuration (0.00)
Posted by djk on 2001-02-26, 03:00:48 (206.24.61.171)
If I remember right an 811 draws about 20mA with zero grid voltage.Look a the curves and figure out what you need. .......
4: Re: Amp on without speaker - what did I blow up? (0.00)
Posted by djk on 2000-12-25, 01:47:31 (206.24.61.139)
You wouldn't have cooked anything if you had a .047µF cap with a 22 ohm series resistor hooked across the 16 ohm tap.Kind of hard to tell now.Check the tubes first. .......
5: My microwave oven has a magnetron TUBE in it (0.00)
Posted by djk on 2000-12-01, 01:54:49 (4.48.62.31)
It ain't solid state. .......
6: What issue ? (0.00)
Posted by djk on 2000-10-30, 23:59:09 (4.16.42.78)
I only have about three years worth of Glass Audio.I do have an issue with I think it was Eric Barbor discussing the merits of old obscure tubes.I was thinking more along the lines of Jenifer Crock's .......
7: Mr Scholl, Victor, Thorsten, and all.... (0.00)
Posted by djk on 2000-10-30, 12:58:03 (4.16.42.82)
How about a short list of tubes to try as a front end to drive a sand (collective gasp here) follower.I am not willing to buy a WE437.What about a 6C45P1 ? 26dB gain with no feedback desired with the .......
8: Poor man's Variac (0.00)
Posted by djk on 2000-10-09, 00:16:06 (4.4.181.158)
The damage will be done by then and you will have a pile of junk.OTOH a lightbulb wired in one side of the AC line will act like a current limiter.A 48vct 3A transformer may be wired to give ~ 24/48/7 .......
9: Re: transformer less powersupplies (0.00)
Posted by djk on 2000-10-05, 00:26:06 (205.175.225.22)
If you only need a few mA of power any pair of surplus transformers may be hooked up back to back to give a 1:1 ratio.For example a pair of 12 volt 1 amp will give 100mA at 120 volts. .......
10: Re: 4ohm speakers thru the 8ohm taps? (0.00)
Posted by djk on 2000-09-02, 19:29:53 (4.16.42.74)
A 4 ohm speaker on an 8 ohm tap will sound louder at low volume levels but generally sound better on the 4 ohm tap.Seeing how you lack a 4 ohm tap I would try connecting the 4 ohm speaker beteen the 8 .......
11: Re: 6080 tubes (0.00)
Posted by djk on 2000-05-23, 23:56:05 (205.175.225.5)
Of course you mean 6AS7.If you go to the ASOG and read the comments you will find that only the Russian 6AS7's are recommended for OTL's.If you anything else they recommend using fusible cathode resis .......
Found 1 records in Tube DIY Asylum.
1: You're Kidding, Right ? (0.00)
Posted by djk on 2002-01-01, 01:55:35 (206.24.61.151)
The power transfomer is about 50VCT, I suppose you could series a bunch of fillaments to run off of this.The output is an autoformer, it would be good for matching 6C33Bs to a low impedance in a circl .......
Found 3 records in SET Asylum.
1: Something in the air (0.00)
Posted by djk on 2000-12-30, 22:59:17 (206.24.61.161)
It must be something in the air.I was listening to some jazz/blues/rock fusion at the local club recently.The front man announced that they had a special request.They don't do requests.But since it wa .......
2: Re: Crossovers & efficiency ? (0.00)
Posted by djk on 2000-12-22, 01:07:31 (206.24.61.150)
If you use a crossover before the amps with a two way with a 500hz crossover point,like an Altec Voice of the Theater,a 5 watt amp on the bass and a 2.5 watt amp on the highs will play as loud as a 25 .......
3: Re: David Berning "OTL SET" 300B (or 811) amp. Too good to be true? (0.00)
Posted by djk on 2000-11-03, 16:24:41 (4.4.181.164)
The humm is at the switching frequency which is above audibility. .......
Found 200 records in Tweakers' Asylum.
1: RE: You Do.... (0.00)
Posted by djk on 2017-11-15, 15:58:14 (199.188.65.49)
R149, R150 are 1K, so you will lose some LF. I would use electrolytics and bypass with film, YMMV. TDM has some good bones to do mods on, have a good time! I have three or four of them laying around, .......
2: RE: You Do.... (0.00)
Posted by djk on 2017-11-15, 15:50:38 (199.188.65.49)
They are in the feedback loop to help mimic the behavior that you would see if a transformer was used. I ripped all that out and converted one of my TDM to unbalanced, it sounded better. The person I .......
3: You Do.... (0.00)
Posted by djk on 2017-11-14, 16:28:28 (199.188.65.49)
You do realize that IC101 drives a 5KΩ load through the 100µF coupling cap? And you do realize the balanced output drivers are loaded with 1KΩ through their 100µF coupling caps? .......
4: RE: Panasonic (0.00)
Posted by djk on 2017-11-09, 16:31:11 (199.188.65.49)
Please re-read my last post. Madisound replaced the frequency caps, did nothing with the electrolytic coupling caps. I bypassed the coupling caps. .......
5: RE: Vishay KP1830 (0.00)
Posted by djk on 2017-11-09, 16:27:53 (199.188.65.49)
Thanks, I'll give them a try. I use the film-and-foil caps from Dayton (probably made by Bennic)as bypass caps in speaker crossovers, but they are too large for the TDM crossovers. .......
6: RE: Power supply switch question (0.00)
Posted by djk on 2017-11-09, 16:21:45 (199.188.65.49)
Micro-arcing makes RF noise. .......
7: Panasonic (0.00)
Posted by djk on 2017-11-08, 16:49:24 (199.188.65.49)
I've been using TDM for over 30years, Madisound used to sell the TDM with polypropylene caps in the frequency positions, but did nothing with the electrolytic coupling caps. Tacking small film caps in .......
8: RE: CD/DVD (0.00)
Posted by djk on 2017-10-10, 13:07:56 (199.188.65.49)
By using a few simple techniques, along with NOVUS Plastic Clean & Shine No. 1, NOVUS Fine Scratch Remover No. 2 & NOVUS Heavy Scratch Remover No. 3, you can actually add life to plastic and keep it l .......
9: Worst ! (0.00)
Posted by djk on 2017-09-19, 15:11:23 (199.188.65.49)
The worst iron for making (or repairing) interconnects I have ever used. A couple of local repair shops used them and always peeled the traces off the boards they worked on. I would rather run out and .......
10: RE: The American Beauty resistance stations range into four figures. nt (0.00)
Posted by djk on 2017-09-12, 14:26:55 (199.188.65.49)
I use Ungar in 27W, 33W, 45W, and 100W models. The hobby Metcal will replace all, and for less than the model you linked to. .......
11: RE: Metcal (0.00)
Posted by djk on 2017-09-11, 14:07:37 (199.188.65.49)
They get rosin fumes in the wand too, easy enough to clean out. .......
12: Metcal (0.00)
Posted by djk on 2017-09-05, 16:01:13 (199.188.65.49)
When you need the best, you need Metcal. In the week after some idiot decided to replace the Metcal irons used for repair (with some $450 Hakko) one repair operator destroyed six circuit boards the si .......
13: RE: Power Cord stripping HELP! (0.00)
Posted by djk on 2017-08-25, 13:39:09 (199.188.65.49)
Bend the cord while cutting into it, the stress in the bend will cause the rubber to tear (so you don't cut into the inner wires). .......
14: Bias (0.00)
Posted by djk on 2017-08-03, 14:29:22 (199.188.65.49)
A quick check of bias parameters shows the 2134 is 4mA (per channel), and the 4562 is 5mA (per channel). .......
15: Please recommend......... (0.00)
Posted by djk on 2017-07-24, 15:15:45 (199.188.65.49)
Could you recommend a couple of oscilloscopes to look at? Audio only, so 50Mhz~100Mhz should be fast enough, dual channel. (time to replace my 40's vintage HP). Is their a decent generator that would .......
16: Common (0.00)
Posted by djk on 2017-07-05, 15:02:19 (199.188.65.49)
It's common. Back in the day (30 years of hi-fi) I used a 100Khz oscilloscope (ignorance was bliss). For audio I generally use just a good electrolytic between 22µF~47µF and leave it at that. (I curre .......
17: Oscillations (0.00)
Posted by djk on 2017-07-03, 14:23:44 (199.188.65.49)
Small film caps for bypass may induce oscillations, depending on the layout of the wires and traces. A low value resistor may be needed in series with the bypass, and a high-speed oscilloscope to make .......
18: RE: External L-pad Connections Wiring Scheme (0.00)
Posted by djk on 2017-06-16, 13:22:32 (199.188.65.49)
I hear you saying you want some sort of tone control or program equalizer. Fine, but I would rather see it done ahead of the amplifier. Tests have shown that the level of the HF with respect to the LF .......
19: RE: External L-pad Connections Wiring Scheme (0.00)
Posted by djk on 2017-06-14, 15:52:28 (199.188.65.49)
What part of my replay didn't you understand? The standard resistor values are never close enough. Run the wire out to an L-pad and do it right. .......
20: RE: External L-pad Connections (0.00)
Posted by djk on 2017-06-12, 15:29:07 (199.188.65.49)
I use an actual L-pad to balance out the speaker, then measure the values required, them build composite resistors (as the exact values required are never available). Use the closet (larger) value, an .......
21: Audio ? (0.00)
Posted by djk on 2017-06-08, 15:35:09 (199.188.65.49)
Looks good for a solder-less repair on cheap audio speaker-wires, kind of pricey though. .......
22: RE: Cable (0.00)
Posted by djk on 2017-04-04, 14:54:35 (199.188.65.49)
Perhaps I should have said "inordinately" expensive instead (USD 43.79)? Harrison Labs are less expensive (~$25), but they don't make a model with the correct attenuation either. .......
23: RE: Cable (0.00)
Posted by djk on 2017-04-03, 16:55:32 (207.191.195.70)
They are stupidly expensive, and only 10dB. 2V -10dB = .664V .......
24: RE: Cable (0.00)
Posted by djk on 2017-04-02, 13:28:40 (207.191.195.70)
Yes, it will knock the signal down about 20dB, or from 2V to about 180mV. .......
25: Cable (0.00)
Posted by djk on 2017-04-01, 14:37:52 (199.188.65.49)
Make a patch cable with a 10K resistor in the hot lead going to the CD player, and a 1K resistor from hot to ground at the amp end. 1/8W are small enough to fit. .......
26: RE: Yamaha B1 (0.00)
Posted by djk on 2016-11-29, 16:02:05 (199.188.65.49)
IXYS makes some 400W rated depletion mode FETs that can replace the original Yamaha part. The B2 outputs are unobtanium. .......
27: RE: Upgrading the CABRE AS45 active crossover (0.00)
Posted by djk on 2016-10-13, 14:56:10 (199.188.65.49)
"bring a certain roughness to the treble, some kind of "dirtyness" that's very obvious on compression drivers." "the opamps are TL082" Probably the source of your problem, as long as there are no seri .......
28: Sold Out ! (0.00)
Posted by djk on 2016-09-15, 16:29:20 (199.188.65.49)
all 20 sold in a couple of days. .......
29: Brass ones $ 5.94 (0.00)
Posted by djk on 2016-09-12, 17:41:20 (199.188.65.49)
. .......
30: $4.27 at GraybaR (0.00)
Posted by djk on 2016-09-12, 14:38:27 (199.188.65.49)
. .......
31: NO ! (0.00)
Posted by djk on 2016-07-28, 15:41:08 (205.175.226.98)
Won't do what you want. A Zobel is worthwhile on some systems, 0.1µF + 10Ω is a common value found on the output of most amplifiers. A similar network on the back of the speaker can help in areas with .......
32: 50% (0.00)
Posted by djk on 2016-06-25, 14:24:22 (199.188.65.49)
It's not a good idea to run electrolytics at less than 50% of their voltage rating, otherwise, some margin is good. .......
33: C15, C16 (0.00)
Posted by djk on 2016-06-17, 22:54:45 (205.175.226.96)
First thing you need to do is replace C16 and C16, and then put a 0.1 .......
34: RE: matching driver watts (0.00)
Posted by djk on 2016-06-03, 20:10:04 (205.175.226.98)
"would i be able to get away with not having a notch filter if the resonance is much lower than the xover point of 400hz ? " No. It will work fine without the notch filter, it will just have a big pea .......
35: RE: matching driver watts (0.00)
Posted by djk on 2016-06-01, 18:30:20 (205.175.226.99)
Probably, but I would try it at 400hz, and use a notch filter on its resonance peak. I used a 94dB woofer section (dual 8's) with a 97dB full-range (attenuated 3dB in the network). .......
36: RE: matching driver watts (0.00)
Posted by djk on 2016-06-01, 13:49:20 (205.175.226.97)
250hz is about the equal power point, half above, half below. Assuming the full-range driver is 3dB more efficient, a 100W woofer paired with a 50W full-range driver would handle about 200W program ma .......
37: David Weems (0.00)
Posted by djk on 2016-04-20, 13:56:29 (199.188.65.49)
He must be channeling the spirit of David Weems, DIY speaker guru from distant past Radio Electronics and Popular Electronics fame. .......
38: 250°C ? (0.00)
Posted by djk on 2015-10-16, 14:16:25 (205.175.226.99)
Most resistors are spec'd at a 250°C rise above ambient. Assuming a 55°C ambient (typical inside equipment) that would be 581°F. Typical solder melts at 179°C, about 354°F. Derate a bunch! ::: TOPIC:: .......
39: RE: help a first-time crossover builder (0.00)
Posted by djk on 2015-10-09, 22:35:06 (205.175.226.96)
"Wouldn't I get better sound building something with capacitors, resistors, and inductors?' Without measuring equipment, no. That kind of stuff is generally designed to work as-is. The JBL 4311 studio .......
40: RE: help a first-time crossover builder (0.00)
Posted by djk on 2015-10-09, 17:49:00 (205.175.226.97)
Most likely the 2.7 is between the woofer and the midrange, and the 1.2 between the midrange and the tweeter. I suggest you leave it as-is, or tack a 0.1µF film cap across each. .......
41: RE: Tonearm tweak (0.00)
Posted by djk on 2015-07-05, 19:44:33 (205.175.226.96)
Yamaha used to make an inexpensive turntable with an arm so bad that you could hear it resonate every time it hit a bad scratch on a record! Literally resonate so loud you could hear it through the ai .......
42: PMX (0.00)
Posted by djk on 2015-06-28, 21:36:04 (205.175.226.99)
The current clad version is two layers of cupronickel, 75% copper and 25% nickel, on a core of pure copper. The total composition of the coin is 8.33% nickel, with the remainder copper. They make the .......
43: RE: LOL !!!!! (0.00)
Posted by djk on 2015-06-28, 20:50:08 (205.175.226.99)
Newer pennies have a zinc core, newer dimes are a copper/nickel sandwich. Pre-64 silver coins are 10% copper. Nickels are 75% copper (war nickels are 35% silver, no nickel). .......
44: RE: Philips (0.00)
Posted by djk on 2015-06-15, 14:58:47 (205.175.226.39)
The speakers I mentioned are mid 70's vintage and used the AD5060W8. .......
45: Philips (0.00)
Posted by djk on 2015-06-14, 20:24:26 (205.175.226.19)
The rubber in old Philips woofers got hard and split. Older loudspeakers from Infinity, Dahlquist, etc, are hard pressed to find replacement midrange drivers, and I know of no source for replacement s .......
46: RE: Vintage speaker driver coil "sag"? (0.00)
Posted by djk on 2015-06-13, 00:04:18 (205.175.226.39)
"I have no idea if that is for real or not" It's real. That reminds me, I need to rotate the woofers in my dad's speakers, they rub after a few years in one position. .......
47: RE: Which Weld Bond product? (0.00)
Posted by djk on 2015-04-24, 18:18:33 (205.175.226.37)
It's all the same, just different packaging (really). I usually buy the 8oz size. If it starts getting thick after a couple of years, just add a bit of water. .......
48: Maybe (0.00)
Posted by djk on 2015-04-22, 23:35:14 (205.175.226.37)
They don't have any more diaphragms, but they might have some suggestions for you. I would do as unclestu suggested and move the rear tweeter to the front, and replace both the rear tweeters with thes .......
49: What (0.00)
Posted by djk on 2015-04-09, 23:15:38 (205.175.226.38)
What is the purpose of the copper foil over the thing? It doesn't look like it is connected to anything? Have you tried a bigger cap? 0.022µF seems too small. .......
50: RE: You made the best choice (0.00)
Posted by djk on 2015-03-31, 23:39:59 (205.175.226.37)
When FRED was king, Schottky was not available in high voltage. .......
51: RE: Request for FRED substitution help (0.00)
Posted by djk on 2015-03-28, 20:06:26 (205.175.226.34)
$0.87 for 15V supply (5A) http://www.digikey.ca/product-detail/en/SR5200-TP/SR5200-TPMSCT-ND/5114054 $2.41 for big power amps (40A) http://www.digikey.ca/product-detail/en/MBR40250TG/MBR40250TGOS-ND/1 .......
52: RE: An addendum (0.00)
Posted by djk on 2015-03-20, 18:30:11 (205.175.226.39)
I hadn't thought about a solder pot. I guess I should have bought it, it was only $40 for a 5 lb spool. I was trying to figure out how much the tin (about $4 a lb) and silver (can't remember) was wort .......
53: RE: Question, please..... (0.00)
Posted by djk on 2015-03-19, 23:13:40 (205.175.226.39)
It was over 40 years old, and cleaning it up was out of the question. .......
54: RE: Why solder has a 'expiry date' ? (0.00)
Posted by djk on 2015-03-19, 18:07:27 (205.175.226.34)
This was a silver solder that was badly, badly tarnished. .......
55: RE: Why solder has a 'expiry date' ? (0.00)
Posted by djk on 2015-03-19, 15:45:11 (205.175.226.34)
Local shop had some old (OLD) solter they were offering for cheap. It looked quite dull (oxidized) so I cut off a small sample, took it home, and tried to solder with it. No go, and it was not a flux .......
56: RE: Speaker Impedance question (0.00)
Posted by djk on 2015-02-28, 23:09:09 (205.175.226.32)
You really have no choice but to use the KEF part (unless you want to mount a tweeter in a pod on top and re-design everything). .......
57: RE: Speaker Impedance question (0.00)
Posted by djk on 2015-02-28, 00:37:05 (205.175.226.32)
A simple 8Ω~10Ω resistor in parallel will make the crossover point the same, but you will need to use a more efficient tweeter to replace the original. More info (make/model/photos, etc.) would help t .......
58: RE: Great - thanks ... (0.00)
Posted by djk on 2015-02-24, 22:49:40 (205.175.226.19)
Pretty much so. .......
59: RE: Value for a DC rail shunt cap? (0.00)
Posted by djk on 2015-02-24, 18:22:20 (205.175.226.19)
10µF + 0.1µF is standard practice. .......
60: I don't buy that. (0.00)
Posted by djk on 2015-02-20, 23:29:57 (205.175.226.39)
" he inserted these between the speaker cable banana plugs and the speakers and it seemed to kick up the bass rather nicely... " I don't buy that. CS99's have no bass, they're too small and too effici .......
61: RE: diy FM Dipole antenna (0.00)
Posted by djk on 2015-02-04, 18:18:47 (205.175.226.38)
Taped on a broomstick so you can rotate it. .......
62: $2 (0.00)
Posted by djk on 2015-02-04, 13:48:39 (205.175.226.38)
$2 at Parts Express. .......
63: 58 inches (0.00)
Posted by djk on 2015-02-04, 00:18:45 (205.175.226.32)
. .......
64: RE: Need help with corner frequency calculations. (0.00)
Posted by djk on 2015-01-22, 18:23:41 (205.175.226.39)
3.21µF is 1.5hz, if you want 15hz use 0.33µF .......
65: RE: Suggestion needed: hum through speakers, when amp is used via single-ended inputs. (0.00)
Posted by djk on 2015-01-06, 23:00:45 (205.175.226.33)
You would seem to have two different problems. The SS amp has current flowing on the shield in unbalanced mode, a 1:1 transformer will fix that. The tube amp may have a hum-balance control that needs .......
66: RE: noisy pot spray?? (0.00)
Posted by djk on 2014-12-17, 15:05:00 (205.175.226.38)
+1 on the DC issue, may have a coupling cap. .......
67: Errata (0.00)
Posted by djk on 2014-12-01, 23:29:45 (205.175.226.38)
" 0.01 uF (10,000 nF)." Should read " 0.01 uF (10nF or 10,000pF)." .......
68: RE: Custom CAN Capacitors (0.00)
Posted by djk on 2014-11-18, 23:21:52 (205.175.226.34)
Standard can size is 1-3/8" Full list: https://www.tubesandmore.com/products/capacitors?page=0%2C0&filters=Type%3DMulti-Section%20/%20Can%20Type Link it 10/10/10 .......
69: Acid (0.00)
Posted by djk on 2014-10-31, 14:51:45 (205.175.226.19)
Asprin is an acid, and works well on soldering things to a steel chassis, but I wouldn't use it on copper without extensive cleaning afterwards. .......
70: RE: Room Correction Systems (0.00)
Posted by djk on 2014-10-23, 23:13:24 (205.175.226.19)
Everyone seems to be in love with those things. But Though they do sound different, do they sound more natural? A clue to the correct answer is to consider this question: Is it possible to correct a t .......
71: RE: Bake ! (0.00)
Posted by djk on 2014-10-04, 00:29:56 (205.175.226.14)
"What do you use carbon composite resistors for " RF in older designs. " Is it something you could do with a kitchen stove?" Sure, preheat oven to 150°F, bake for 1hour, then raise to 250°F for an hou .......
72: RE: Bake ! (0.00)
Posted by djk on 2014-10-04, 00:23:29 (205.175.226.14)
Its mainly back coated tape that needs to bake to soften up the lube. .......
73: RE: Bake ! (0.00)
Posted by djk on 2014-09-12, 23:13:13 (205.175.226.19)
I work in an aerospace concern, we bake them. A while back we bought Allen Bradley so we could stock up on carbons (after they had discontinued them). I suppose if they were dry enough to start out wi .......
74: Bake ! (0.00)
Posted by djk on 2014-09-11, 16:59:40 (205.175.226.14)
Carbon comps must be baked prior to use to drive out the moisture they have absorbed over the years. The shock from soldering will alter the resistor permanently if you don't bake it first. ::: TOPIC: .......
75: 40 Mhz (0.00)
Posted by djk on 2014-07-08, 00:11:41 (205.175.225.23)
http://www.onsemi.com/pub_link/Collateral/MJE243-D.PDF .......
76: Exicon and Semelab (0.00)
Posted by djk on 2014-05-19, 23:18:25 (205.175.225.23)
"Hitachi is the only company that makes the MOSFETS that fit these units." Hafler used Exicon outputs the last few years of production. http://www.profusionplc.com/pro/gex/prodGen.html?prdtyp=lateral% .......
77: RE: Replacing electrolytic caps with poly caps?? (0.00)
Posted by djk on 2014-04-03, 16:18:50 (205.175.225.23)
Is it a MM or MC input? You might just want to use a good electrolytic and add a film bypass. If an MC you might have to go series electrolytics and film bypass caps and a battery for bias (shelf life .......
78: RE: Looking for a quad of 68,000 uf /100volt Electrolytics (0.00)
Posted by djk on 2014-04-02, 16:36:17 (205.175.225.23)
Without the size, this request goes in the round file. .......
79: Steam Powered ? (nt) (0.00)
Posted by djk on 2014-03-07, 14:08:47 (205.175.225.22)
. .......
80: RE: Some question about speakers cabinet (0.00)
Posted by djk on 2014-01-23, 13:59:04 (205.175.225.22)
You hear the vibrations from all the panels, not just the front one. Bass requires rigidity above all else. Midbass on up requires damping above rigidity. A full range box requires both. The old BBC m .......
81: RE: NAD 2400 amp tweaks (0.00)
Posted by djk on 2013-12-16, 21:01:37 (205.175.225.22)
Frost King is another popular brand. .......
82: RE: Best material for boxes for electronic circuits (0.00)
Posted by djk on 2013-12-03, 01:26:28 (205.175.225.12)
Copper may be the best, ferrous metals the worst. .......
83: E&I vs Toroid (0.00)
Posted by djk on 2013-11-25, 15:30:02 (205.175.225.22)
An E&I type with a split-bobbin that is wound side-by-side will have less noise than even a toroid with a screen between the primary and secondary. Considering that you can also add a screen (and ext .......
84: Iron vs Air ? (0.00)
Posted by djk on 2013-11-24, 00:48:11 (205.175.225.22)
The author of your paragraph is correct: Messing with the DCR of inductors in a well designed system will affect the sound in a negative way. I might go along with replacing an iron-cored inductor wit .......
85: RE: Using the 5532 (0.00)
Posted by djk on 2013-10-27, 20:18:03 (205.175.225.23)
So what do you recommend a neophyte do when his supply is inadequate, and the board layout is inadequate, and the new opamp misbehaves? The 627 is not a drop-in for most gear. .......
86: Using the 5532 (0.00)
Posted by djk on 2013-10-26, 21:19:04 (205.175.225.12)
I would use the 5532, although long-in-the-tooth, it still sounds great. It will also be less sensitive to layout issues. Sure some of the other types listed may sound a bit better, but they may not l .......
87: RE: Can't get on Madisound . . . anybody else? (0.00)
Posted by djk on 2013-10-23, 18:19:04 (205.175.225.12)
Both store and forum work fine for me. .......
88: Yamaha (0.00)
Posted by djk on 2013-10-20, 23:25:47 (205.175.225.22)
Yamaha made a coffee-proof fader by using a sealed rotary pot with a rack-and-pinion gear arrangement. The felt sounds like the best idea, along with a sign promising swift death to smokers and drink .......
89: Test (0.00)
Posted by djk on 2013-10-08, 14:05:10 (205.175.225.23)
For test purposes at a very low level you may use a polarized cap. If the network part is bad, order the correct type for replacement use. .......
90: RE: Rec Out (0.00)
Posted by djk on 2013-08-13, 15:58:20 (63.152.99.225)
RecOut is to feed a tape recorder, but it will work as an input if you tune to a dead spot on the tuner. The RecOut is connected at the volume control where it feeds the amplifier, so feeding an input .......
91: Rec Out (0.00)
Posted by djk on 2013-08-13, 00:21:19 (63.152.99.225)
Just plug into the Rec Out, you will need to set the tuner to a blank spot on the band. .......
92: dundee test (0.00)
Posted by djk on 2013-07-14, 04:41:28 (63.152.99.225)
A straightforward test carried out in nightclubs to ensure the chick you're chatting up is a chick and not a chick with a dick. The test is performed simply by grabbing the subject by the groin to .......
93: Power Factor (0.00)
Posted by djk on 2013-07-05, 17:08:52 (63.152.99.225)
The explanation I read stated that it contained a capacitor to improve power factor correction when driving inductive loads. While this may reduce the power you consume, it will probably not reduce yo .......
94: RE: Cap Upgrade - Rephrased (0.00)
Posted by djk on 2013-06-27, 18:10:17 (205.175.225.22)
The PC types I tried for tweeter crossovers sounded glassy, not recommended. .......
95: Who is correct??? (0.00)
Posted by djk on 2013-06-15, 16:31:31 (63.152.104.141)
"Who is correct???" Both. Most people can't hear, and most speakers aren't good enough. I mentioned a bad experience with an older top-of-the-line Thiel model where changing to film in the midrange cr .......
96: RE: Fuses (0.00)
Posted by djk on 2013-06-13, 18:10:52 (205.175.225.22)
They have a damping powder inside. If you have a glass fuse like and ACCxA, then you would want a ceramic ABCxA (xA being the current value in amps). .......
97: Rectifier and filter caps are probably in the DAC chassis. (0.00)
Posted by djk on 2013-06-10, 11:40:33 (63.152.104.141)
+1 Also, the output is two red and a black. If it was DC it would use a third color. .......
98: So........ (0.00)
Posted by djk on 2013-06-07, 00:17:42 (63.152.104.141)
Did you load in the third set of outputs so it will handle low impedance loads better? Did you add some power supply bypass caps? What did you use for iron for the second amp? .......
99: RE: Square D sub-panel box (0.00)
Posted by djk on 2013-06-02, 15:09:48 (71.221.252.209)
I prefer Cutler-Hammer for the shape of the contacts on the breakers. .......
100: RE: Most suprising tweak or parts upgrade? (0.00)
Posted by djk on 2013-05-10, 18:14:07 (205.175.225.12)
Cleaning the multi-pin connetors inside an amplifier with De-Oxit. Unbelievable change for very little time and money. ************************* Adding a couple of 0.1µF film caps in parallel with the .......
101: Dual (0.00)
Posted by djk on 2013-05-04, 07:14:53 (71.221.252.209)
Dual (and many other brands) would play upside-down (if you could figure out how to clamp the record on the platter). .......
102: RE: Please forgive my ignorance - where do you connect ground.... (0.00)
Posted by djk on 2013-04-02, 13:18:27 (63.152.93.252)
Ground would be hooked to the chassis the supply is mounted in. .......
103: RE: Caps tweek for Paradigm Atoms (0.00)
Posted by djk on 2013-03-29, 02:09:05 (63.152.93.252)
Replacing a bi-polar electrolytic with a film type may require a change in cap value as well as a change in the pad for the driver. It can appear to lower the crossover point and make the tweeter pla .......
104: RE: Caps tweek for Paradigm Atoms (0.00)
Posted by djk on 2013-03-28, 01:00:36 (63.152.93.252)
0.1µF Dayton foil and film bypass caps are very worthwhile. .......
105: RE: What is this UTC transformer? (0.00)
Posted by djk on 2013-03-16, 00:10:44 (63.152.93.252)
70 lbs? Probably not from an O'scope. .......
106: RE: What is this UTC transformer? (0.00)
Posted by djk on 2013-03-15, 13:23:03 (63.152.93.252)
O'scope transformer? .......
107: RE: Vintage Realistic Minimus 7W Upgrade (0.00)
Posted by djk on 2013-03-01, 00:24:06 (63.152.93.252)
Fragile tweeters. After a full crossover re-design they sounded better than the A/D/S L-200 that we were a dealer for. Smoked the tweeters bi-amping at 400hz to a pair of 15s. .......
108: RE: There is a spark when you close the switch as well. (0.00)
Posted by djk on 2013-02-23, 17:12:47 (63.152.93.252)
I am not aware of a quality amplifier that does not already have an appropriate sized cap across the switch from the factory. .......
109: When you open the switch, not when you close it ! (0.00)
Posted by djk on 2013-02-22, 12:45:46 (63.152.93.252)
When you open the switch, not when you close it ! Most designs already have a cap, and a lot bigger value as well. .......
110: RE: Are you sure ? (0.00)
Posted by djk on 2013-02-21, 16:47:02 (205.175.225.22)
"then the cap is the way to go." And your solution of a capacitor is going to help how? The 2Ω inrush current limiter should do the trick, your capcitor will not. .......
111: Are you sure ? (0.00)
Posted by djk on 2013-02-21, 12:32:47 (63.152.93.252)
I find your advice to be totally wrong. Most amplifiers have caps across the switch for arc prevention, it doesn't keep them from eating the switch from the turn-on transient. "you would absolutely b .......
112: RE: Pinging djk. EDGE M8 inrush limiter... (0.00)
Posted by djk on 2013-02-19, 18:03:16 (63.152.93.252)
The CL101 is 0.5Ω 16A, it was used in the Hafler DH500. It was inadequate at protecting the power switch so I changed it to 2.5Ω and added another pole on the relay. How much does that ampli .......
113: RE: What do they say? (0.00)
Posted by djk on 2013-02-15, 15:52:46 (205.175.225.22)
Does the twist go the same direction in the Southern Hemisphere? .......
114: RE: Safe Change In Main Caps In Power Amp (0.00)
Posted by djk on 2013-02-08, 00:05:11 (63.152.93.252)
It sounds like it may need a higher ohm value. Do you know what it has now? the Hafler DH500 had no inrush limiter originally, it ate power switches for breakfast (lunch and dinner too). They then add .......
115: RE: Safe Change In Main Caps In Power Amp (0.00)
Posted by djk on 2013-02-07, 12:51:11 (63.152.93.252)
An inrush limiter is what you need. .......
116: RE: Not Necessary (0.00)
Posted by djk on 2013-01-27, 15:39:11 (97.127.189.238)
Draw what out? It's a plywood open baffle. The wires hook up to the divers in the regular way, a cap is in series with one lead of the HF driver. .......
117: Really ? (0.00)
Posted by djk on 2013-01-26, 13:09:20 (97.127.189.238)
Look down the thread a bit, $99. .......
118: RE: Mechanical ? (0.00)
Posted by djk on 2013-01-21, 10:30:53 (97.127.189.238)
You have some DC off-set on your power line. It will come and go as people in the area that use the same distribution transformer switch asymmetrical loads on and off. These can be slow-cookers, hair- .......
119: Mechanical ? (0.00)
Posted by djk on 2013-01-20, 13:18:34 (97.127.189.238)
When you say hum, is it from the speakers, or emanating from the amplifier (transformer hum)? .......
120: RE: $350 is a bit much when we're talking in the $20 range. (0.00)
Posted by djk on 2013-01-12, 19:05:44 (97.127.189.238)
It has a balance as well as the volume and input selector. One must hope that they baked the moisture out of the carbon composition resistors before soldering them in circuit, not everyone is aware th .......
121: $350 is a bit much when we're talking in the $20 range. (0.00)
Posted by djk on 2013-01-12, 15:14:29 (97.127.189.238)
$350 is a bit much when we're talking in the $20 range. It's always nice to see what's out there though. .......
122: Radio Shack (0.00)
Posted by djk on 2013-01-12, 10:39:47 (97.127.189.238)
Many of these switch boxes have enough space for a volume control. A friend of mine used one of the Radio Shack models with a nice Alps volume control that he got at the same Radio Shack. .......
123: RE: You prolly meant the Backfire Effect (0.00)
Posted by djk on 2013-01-01, 22:53:25 (97.127.189.238)
Hmmm, sounds too much like religion for my taste. .......
124: RE: Must be done this way. (0.00)
Posted by djk on 2012-12-27, 03:41:14 (97.127.189.238)
A half-wave voltage doubler. Change the polarity of the caps and diodes for the negative supply. Low current use only. .......
125: Must be done this way. (0.00)
Posted by djk on 2012-12-27, 03:25:06 (97.127.189.238)
Change the polarity of the diodes and caps, low current use only. .......
126: 1" Maple, $42 (0.00)
Posted by djk on 2012-12-22, 19:35:27 (97.127.189.238)
24"x32" 25mm 20 ply with Maple faces, about $40. BAP-RCMAP-012432 A-1 White Maple WPF ApplePly - 1" - 24"x 32" $42.27 BAP-RCMAP-342432 A-1 White Maple WPF ApplePly - 3/4" - 24"x 32" $31.73 Other venee .......
127: How about ? (0.00)
Posted by djk on 2012-12-22, 18:16:18 (97.127.189.238)
How about storing my spare Britta water filter cartridges on top of the speakers? They contain activated charcoal granules. .......
128: RE: Newb DIY question (0.00)
Posted by djk on 2012-12-09, 07:08:00 (97.127.189.238)
What is a a Wilson reciever? .......
129: RE: balanced to unbalanced conversion (0.00)
Posted by djk on 2012-12-09, 06:32:14 (97.127.189.238)
Sure. .......
130: RE: "high-zoot stuff measures better but doesn't sound like music" (0.00)
Posted by djk on 2012-12-08, 12:34:23 (97.127.189.238)
A nice story, but there may be other reasons for the improved sound. A split-bobbin that is wound side-by-side will have less noise than even a toroid with a screen between the primary and secondary. .......
131: RE: balanced to unbalanced conversion (0.00)
Posted by djk on 2012-12-08, 12:29:12 (97.127.189.238)
The added input transformer is in parallel with the grid-leak (bias) resistor and the amplifier will get much quieter with the transformer. This is heard as increased low-level detail and a cleaner so .......
132: RE: My hesitation in trying a choke input (0.00)
Posted by djk on 2012-12-08, 12:19:10 (97.127.189.238)
Choke input filters are fine for low current circuits. The DRC is only an issue with a load current that varies widely, not an issue for most line-level circuits. PSU Designer II is designed to help y .......
133: RE: "but a big one with a light load will be just about as bad" (0.00)
Posted by djk on 2012-12-08, 01:12:45 (97.127.189.238)
"just as bad" refers to an unregulated supply. Lightly loaded it will be high voltage all the time. A heavily loaded smaller supply will produce a voltage closer to what is needed. Regulators are dirt .......
134: RE: balanced to unbalanced conversion (0.00)
Posted by djk on 2012-12-08, 01:00:27 (97.127.189.238)
You can just use a 1:1 10K inside the amp, it will be fine. If the RCA jacks are isolated from the chassis you can use them (really), no need to punch out a hole and mount an XLR. .......
135: RE: Thanks for the advice (0.00)
Posted by djk on 2012-12-07, 04:19:44 (97.127.189.238)
Try starting simple. This is ±15V, but changing the 3-terminal regulator for whatever you need. .......
136: RE: Thanks for the advice (0.00)
Posted by djk on 2012-12-06, 18:10:04 (205.175.225.23)
It would probably be best if you made your own supply with a linear regulator. The voltage of a wall-plug off-load is going to be on the order of 1.414 times the nominal voltage + 20%, or around 8.5V .......
137: RE: Question on Wall-Wart PS's? (0.00)
Posted by djk on 2012-12-06, 15:55:18 (205.175.225.22)
Transformers are specied at full load. The smaller they are the worse the regulation they have, but a big one with a light load will be just about as bad. Buy a regulated supply if that's what you thi .......
138: RE: Why stop there? (0.00)
Posted by djk on 2012-11-25, 06:42:26 (63.152.69.89)
With multiple layers you could make an Orgone Energy Suit, that might be the ticket! .......
139: RE: Audiophile shielded listening suit - where to buy? (0.00)
Posted by djk on 2012-11-25, 01:18:31 (63.152.69.89)
Just wrap yourself in tin foil, that should do it. Also see: Orgone energy box. .......
140: RE: CD player output caps replaced--WOW!!! (0.00)
Posted by djk on 2012-11-25, 01:16:31 (63.152.69.89)
I just tack a pair of 0.1µF film caps across the output caps, no schematic needed, and I paid $40 for a bag of 1,000 of them. A Nakamichi OMS1A has holes drilled and screened on the board for these ca .......
141: RE: Must be (0.00)
Posted by djk on 2012-11-15, 23:08:44 (63.152.69.89)
Same stuff as oven cleaner. .......
142: Gold Contamination (0.00)
Posted by djk on 2012-11-15, 23:06:50 (63.152.69.89)
Gold migrates into the tin and makes the solder joint brittle. Always tin gold leads, then use solder-wick and wick it dry, and then solder with 2% (or higher) silver-bearing solder. .......
143: Lye and Salt (0.00)
Posted by djk on 2012-11-15, 16:02:10 (205.175.225.22)
Lye and salt heated in a crucible with a torch and dip the wire, works perfectly. .......
144: RE: It should be noted that VD, voltage drop, sag, (0.00)
Posted by djk on 2012-11-12, 08:29:25 (71.38.188.194)
Exactly, which is why you do it. .......
145: RE: Pro Sound (0.00)
Posted by djk on 2012-11-11, 11:08:09 (71.38.188.194)
"What a 20 amp breaker like that of a Square D QO120 20 amp breaker, will do is pass short duration spurts of currents as high as 100 amps all day long." Which is all I need it to do. 3x 2KW at 50% ef .......
146: Pro Sound (0.00)
Posted by djk on 2012-11-11, 07:59:28 (71.38.188.194)
In pro sound (PA) we will run three 2KW amplifiers off one 20A breaker. A 20A breaker will pass 40A for about one hour, 4.8KW, that's probably enough for home use. If you want to test your home AC wir .......
147: Star-Quad (0.00)
Posted by djk on 2012-11-01, 12:45:21 (63.152.115.10)
Equivalent to 13ga: http://www.markertek.com/Cables/Bulk-Wire-Cable/Speaker-Wire-Cable-Bulk/Canare-Corporation-Of-America/4S8-BLACK200M.xhtml Equivalent to 11ga: http://www.markertek.com/Cables/Bulk-W .......
148: RE: "Mythbusters" tried that.....no shock noted..... NT (0.00)
Posted by djk on 2012-10-10, 00:18:05 (97.127.185.198)
. .......
149: Noise ! (0.00)
Posted by djk on 2012-10-10, 00:08:06 (97.127.185.198)
A toroid with a screen between the primary and secondary is generally noisier than a split-bobbin E&I transformer. If the toroid doesn't have a screen it will probably be much worse. .......
150: RE: Problem Solved Cheaply (0.00)
Posted by djk on 2012-10-02, 13:45:40 (205.175.225.23)
A diode bridge costs less than a good toggle switch, and is safer. .......
151: RE: Help needed eliminating ground buzz from nearby electric fences (0.00)
Posted by djk on 2012-10-01, 23:50:28 (63.152.126.49)
Take note of the Bryston drawing. The bridge on the right is to eliminate DC off-set from causing toroid buzz. The bridge on the left is to lift the ground for noise purposes, yet it will conduct du .......
152: RE: Has anyone tried these on tubes (at base)? (0.00)
Posted by djk on 2012-10-01, 13:18:43 (63.152.126.49)
Thorsten had good results on a WE300 tube. .......
153: RE: I don't know about ungrounding my present BMC equipment, but I have always found ungrounded sounds much better (0.00)
Posted by djk on 2012-09-28, 00:45:09 (63.152.97.36)
The Hum-X are easy to build, or $70 to buy. .......
154: Lazy ? (0.00)
Posted by djk on 2012-09-23, 16:58:28 (63.152.106.226)
I just high-lite the address, right-click, and open it in a new window. .......
155: RE: Thanks, so that;s what's wrong with the HL in line items (0.00)
Posted by djk on 2012-09-11, 04:24:17 (63.152.114.103)
You want to run Quads below 120hz? .......
156: RE: putting passive line-level crossovers inside RCA.adaptors. (0.00)
Posted by djk on 2012-09-10, 23:54:55 (63.152.114.103)
You will need a box for good caps, they're big. Passive line-level low-pass filters are not particularly practical, they have high insertion loss and low Q. I started building passive line-level filte .......
157: EMI/RFI ? (0.00)
Posted by djk on 2012-09-10, 00:46:26 (63.152.114.103)
Thank you for the detailed explanation. What would be your thoughts on running 12-3 (ground through the third wire) inside the flexible metallic conduit and grounding the conduit on one end only? Woul .......
158: Question for Jon Risch ? (0.00)
Posted by djk on 2012-09-07, 23:33:44 (63.152.114.103)
That's not Romex, it looks like steel Green Field flexible conduit. I would think that would be extra bad. Flexible conduit is also available in aluminum, PVC, and corrugated polyamide (Nylon). I won .......
159: RE: http://www.parts-express.com/cat/tweeters/17?kg=254314242 (0.00)
Posted by djk on 2012-08-28, 01:28:08 (63.152.92.53)
Click on the link (in my previous post) and look at the one marked G-o-l-d-w-o-o-d. I'll give you another hint, it's the only one for about $6 (as mentioned in my previous post). .......
160: http://www.parts-express.com/cat/tweeters/17?kg=254314242 (0.00)
Posted by djk on 2012-08-27, 18:21:23 (205.175.225.23)
Looks like the Goldwood would be the best replacement. I would replace the pair so that they sound the same, about $6 each. .......
161: RE: Dual Opamp (0.00)
Posted by djk on 2012-08-25, 01:23:52 (71.221.253.197)
That's a quiet opamp, and plenty fast for a phono. I might try a 2mA pull down to the negative supply. This would force the output stage into class A. Try a simple resistor first, and then maybe a J-F .......
162: RE: tweaking FM reception (0.00)
Posted by djk on 2012-08-11, 00:58:38 (97.127.188.190)
With no connection for an external antenna I see no hope. .......
163: Good Idea ! (nt) (0.00)
Posted by djk on 2012-08-06, 13:26:02 (63.152.94.169)
. .......
164: RE: pics (0.00)
Posted by djk on 2012-08-05, 16:08:36 (63.152.94.169)
I suggest you throw them all away. That black cap with the red end-fill in the 47/100/220 drawer looks like a Callins. While they sounded great, they had the shortest life of anything (other than the .......
165: RE: Garage sale capicator haul...questions now :) (0.00)
Posted by djk on 2012-08-04, 20:22:53 (63.152.94.169)
It might be a good idea to throw away all small electrolytics that are more than 10 years old. .......
166: RE: Metcal solder iron problem (0.00)
Posted by djk on 2012-07-18, 18:03:42 (205.175.225.22)
Most likely the co-axial connection to the tip is dirty. Rotate the cold tip in the handset several times and it should clean up. Solder smoke and flux residue are the usual suspects. .......
167: Facts (0.00)
Posted by djk on 2012-07-16, 07:12:32 (71.221.245.15)
A good read. .......
168: RE: Caps and STK IC's, Need you help. (0.00)
Posted by djk on 2012-06-25, 13:04:13 (63.152.92.128)
Don't forget the thermal compound. .......
169: RE: Battery bias in a speaker crossover? (nt) (0.00)
Posted by djk on 2012-06-20, 18:11:35 (205.175.225.23)
Then I would just use the pair of 4700µF/100V back-to-back with a 10µF film bypass. .......
170: RE: Where to get large value NP caps ?. (0.00)
Posted by djk on 2012-06-20, 00:50:11 (63.152.110.98)
I wouldn't worry about it too much, I would parallel the combination with a film cap, or even consider battery bias (since there are two caps anyway). .......
171: RE: Where to get large value NP caps ?. (0.00)
Posted by djk on 2012-06-19, 12:44:57 (63.152.110.98)
I would use two 4700µF back-to-back. .......
172: RE: Can I bypass parallel Caps (0.00)
Posted by djk on 2012-06-16, 06:22:25 (63.152.110.98)
Sure. The Leach amplifier has provision for a bi-polar cap with a film bypass, or two back-to-back polar caps with a film bypass. "C6 is an electrolytic capacitor. C7 is a film capacitor which is used .......
173: Cold Water (0.00)
Posted by djk on 2012-06-15, 01:31:25 (63.152.110.98)
Not to throw cold water on your idea, but noise-based RTA requires huge amounts of time to integrate the detected signal in order to be accurate. The swept-filter based designs have, at best,marginal .......
174: RE: Power capacitor brand/supplier 33000uF/100V (0.00)
Posted by djk on 2012-06-08, 03:34:43 (63.152.110.98)
With the bypass caps on the driver cards, almost any cap that fits will sound OK. .......
175: RE: Pleas Recommend Fittings For A Component Matching LCRZ Measurement Jig (0.00)
Posted by djk on 2012-05-23, 02:04:20 (63.152.17.8)
Getting a bit anal for audio testing, looks worthless for RF. .......
176: Qts issues (0.00)
Posted by djk on 2012-05-05, 18:36:09 (63.152.20.216)
Series R causes attenuation, but it is only a fraction of 1dB as long as it it less than 10% of the driver DCR. What is more important is that series R raises Qes, which in turn raises Qts, which in t .......
177: Steve Bench (0.00)
Posted by djk on 2012-04-08, 07:18:31 (63.152.42.190)
. .......
178: Tests ? (0.00)
Posted by djk on 2012-04-06, 00:42:46 (63.152.42.190)
.......
179: RE: anything I need to check? (0.00)
Posted by djk on 2012-04-02, 15:59:29 (205.175.225.22)
Ivan is probably correct, amp repair is not something that can be taught in a 100 word post. .......
180: RE: Help, need cyrus audio amp repair advice (0.00)
Posted by djk on 2012-04-01, 01:08:11 (63.152.42.190)
You probably fried the outputs, drivers, emitter resistors, etc. .......
181: RE: "A picture is worth a thousand words.... " (0.00)
Posted by djk on 2012-03-10, 22:38:27 (63.152.42.190)
The CDE with a bypass is probably a good choice. The suggestion for the charge-coupled circuit was to save money and improve sound quality at the same time. Note that JBL uses this circuit in their to .......
182: RE: 390uF capacitor for audio? (0.00)
Posted by djk on 2012-03-10, 17:38:00 (63.152.42.190)
.......
183: RE: Best 390uF capacitor for audio? (0.00)
Posted by djk on 2012-03-10, 01:25:00 (63.152.42.190)
Did you understand the charge-coupled network design posted in the other forum? .......
184: RE: possible ps improvement (0.00)
Posted by djk on 2012-03-07, 00:23:15 (63.152.42.190)
I just looked at the product, it already has a built-in cover to prevent drafts. I use a cheap scale that does not have a cover. .......
185: RE: possible ps improvement (0.00)
Posted by djk on 2012-03-06, 16:04:29 (205.175.225.23)
No, you would be better off building a small chamber to exclude drafts. .......
186: RE: input tweaks - McIntosh MC2120 (0.00)
Posted by djk on 2012-03-04, 17:02:45 (63.152.42.190)
This is what I do: "Which caps are they DJK? I'll try them in my 2125." Add one 47µF across each ±42V rail at the main filter caps Add a 0.01µF~0.1µF film cap in parallel with C239, 240 (little board .......
187: Schematic (0.00)
Posted by djk on 2012-02-23, 00:11:06 (63.152.23.174)
Get it and then we can talk. .......
188: RE: How does track sensor work on Fisher TT's ?. (0.00)
Posted by djk on 2012-02-19, 16:15:34 (63.152.23.174)
It bounces light from an LED off the shiny space between cuts. .......
189: RE: Damage to Electrolytic Caps (0.00)
Posted by djk on 2012-02-14, 05:24:13 (71.213.196.160)
I am amazed they didn't blow up in his face. .......
190: RE: DIY Phantom Acoustics Shadow (0.00)
Posted by djk on 2012-02-03, 18:12:09 (205.175.225.23)
The patent has enough info to build one. .......
191: Discrete (0.00)
Posted by djk on 2012-01-24, 23:43:35 (205.175.225.23)
The Sumo Delilah wasn't too bad. The Delilah used discrete transistors, not opamps. It had real high-pass and low-pass filters, not the subtractive filter type. The high-pass and low pass filters coul .......
192: Underlap ? (0.00)
Posted by djk on 2012-01-23, 18:17:16 (205.175.225.12)
A 2nd order would be -6dB at 50hz, a 3rd order would be -9dB down at 50hz, see the Pass article. With the Fig. 8 one opamp circuit almost any transfer function may be obtained. A minor underlap (raisi .......
193: Phase coherent crossover networks (0.00)
Posted by djk on 2012-01-20, 23:50:43 (71.213.196.241)
Read the Nelson Pass article please. I suggest you try fig. 2B before you go any further. The photo is of the typical crossover type found today. We see that the high out actually has all the noise, d .......
194: Rule of Thumb (0.00)
Posted by djk on 2011-12-29, 02:31:20 (71.213.196.241)
At low volumes a speaker always plays loudest on the 8 and 16 ohm taps. As you turn up the volume and 'thump' it a bit you will find the speaker sounds the best on the tap that closest matches its im .......
195: RE: My Experience (0.00)
Posted by djk on 2011-12-29, 02:25:49 (71.213.196.241)
"Regarding shorts, a number of tube guitar amps have output jacks that are shorted when nothing is plugged in." That does not mean the amplifier is seeing a short. Look at the schematic. "These are on .......
196: RE: "TUBE amps are different. They like SHORTS." (0.00)
Posted by djk on 2011-12-29, 01:42:13 (71.213.196.241)
The original poster wanted to wire the 16Ω resistor in parallel with the 16Ω loudspeaker and run it on the 8Ω tap. I am still laughing though at Mr Beaver's suggestion that a tube ampli .......
197: My Experience (0.00)
Posted by djk on 2011-12-28, 12:08:16 (71.213.196.241)
My 30+ years of experience with tube amplifiers driving speakers like Klipsch that vary from 5Ω to 70Ω shows that the amplifiers last longer than when they drive a more constant, matched loa .......
198: RE: 16 ohm speaker in to 8 ohm tube amp, Help! (0.00)
Posted by djk on 2011-12-27, 15:28:26 (71.213.196.241)
Don't do anything, the amplifier will work just fine. Add in a resistor will just generate heat, and make the output tube have a shorter life. .......
199: RE: I hve some old solder with a high silver content and it is five or six years old and it still works just fine. (0.00)
Posted by djk on 2011-12-13, 16:03:07 (205.175.225.12)
I have no idea of the age of the solder that wouldn't solder, it was old, and looked old. "Silver tarnish conducts electricity just fine." Only if reduced in pure oxygen. In real air it forms non-cond .......
200: Yes (0.00)
Posted by djk on 2011-12-13, 14:13:05 (205.175.225.23)
It oxidizes and cannot be soldered. If you could bag it with an inert gas there would be no problems. A while back I got offered a deal on some old solder with 4% silver. fortunately I took a small sa .......
Found 2 records in VK Music - Elekit & Triode Japan Forum.
1: RE: Perspex/plexiglass kit for TU8340? (0.00)
Posted by DjKeath on 2017-04-26, 21:50:27 (101.179.212.107)
Thanks Victor. A plan would be great. I can get one made up. .......
2: Perspex/plexiglass kit for TU8340? (0.00)
Posted by DjKeath on 2017-04-26, 19:02:20 (1.144.96.130)
Victor, Any chance of ELEKIT doing a perspex body kit for the TU8340? It looks so good see through. Does it handle the heat? .......
Found total of 983 records, Query: , Author: djk in All Forums, Time: 0 sec.