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1: Propeller Head Plaza, Sound Technology 1700B (0.00)
Posted by Trevor Wilson on 2022-01-02, 14:58:53 (84.17.46.213)
Well, it's been a few years. My 1700B has decided to cease operation, so it really is time for a repair and full rebuild. Here's what I am planning: * Replace all electrolytic caps in the unit. One of .......
2: Amp/Preamp Asylum, Re: Safe to use amp on side? (0.00)
Posted by Trevor Wilson on 2006-04-04, 17:12:06 (149.135.8.160)
No! Don't do it. The heat sinks in the Rotel are deisgned to operate vertically. Operating them horizontally will reduce their efficiency by around 90%. The amp will be damaged. Trevor .......
3: Tech Square, Sound Blaster Audigy mods (0.00)
Posted by Trevor Wilson on 2005-02-03, 18:13:13 (220.240.18.219)
I just installed a Sound Blaster Audigy ZS into my workshop PC. Pretty impressive critter, for not much cash. My intention is to use the thing for audio measurements, rather than actually listening to .......
4: Tech Square, Re: Sound Technology 1700B modifications (0.00)
Posted by Trevor Wilson on 2005-01-26, 15:20:55 (220.240.6.106)
Thanks a bundle John. I'll give it a try. The thing won't measure distortion, so I need to get inside. Once there, I figure on making some improvements. Trevor .......
5: High Efficiency Speaker Asylum, Why do you think that the two are incompatible? (0.00)
Posted by Trevor Wilson on 2005-01-24, 17:32:14 (220.240.6.106)
http://www.ambiencespeakers.com.au/ Look for Reference 1800 model. 96dB/2.83VRMS/1 metre. Trevor .......
6: Tech Square, Sound Technology 1700B modifications (0.00)
Posted by Trevor Wilson on 2005-01-24, 16:43:45 (220.240.6.106)
I recently acquired one of these critters and need to perform some service to it. I seem to recall an article in Audio Amateur (possibly) which outlines some mods to the beastie. I figure on making so .......
7: Amp/Preamp Asylum, Re: Need help on picking a new stereo amp... (0.00)
Posted by Trevor Wilson on 2003-09-07, 14:58:51 (220.240.0.176)
With Bose 301s? IT doesn't matter. Just choose the cheapest amp you can find. Personally, I'd take the NAD back to the repair shop and demand that they fix it correctly. Trevor .......
8: Amp/Preamp Asylum, No, MOSFETs are really, really fast, BUT...... (0.00)
Posted by Trevor Wilson on 2003-09-07, 14:00:37 (220.240.0.176)
.....and this is a really BIG but, MOSFETs lack 'slam' and 'punch'. MOSFETs exhibit this effect, because they possess a characteristic known as 'Negative Temperature Co-efficient of gm'. Sounds comple .......
9: General Asylum, Loved it! (0.00)
Posted by Trevor Wilson on 2003-08-13, 02:56:35 (203.220.36.135)
When they were in Sydney a couple of years ago, I saw Allegria. Absolutely stunning stuff. Not only are they breathtakingly talented, but the constumes are sumptuous. Attnetion to detail is amazing. .......
10: Amp/Preamp Asylum, Forget power .... (0.00)
Posted by Trevor Wilson on 2003-08-12, 14:36:41 (203.220.36.135)
....and concentrate on the CURRENT ability of the amplifier. For these speakers, you'll find that a 500 Watt @ 8 Ohm amplifier may sound worse, than (say) a 100 Watt amp, which can deliver 100 Amps, o .......
11: Tech Square, Re: Hey Trevor!! (0.00)
Posted by Trevor Wilson on 2003-08-10, 15:55:06 (203.220.36.135)
I just spoke with Vince Testa on the 'phone. He tells me that Symphonia is no longer manufacturing any product. He indicated that he will support any items manufactured by Symphonia, however. You can .......
12: Tech Square, Tech info on Spectron Musician (0.00)
Posted by Trevor Wilson on 2003-08-09, 02:29:31 (203.220.36.135)
Can anyone help with the component values for the output filter on the Spctron Musician? TIA Trevor .......
13: General Asylum, Re: Hey Trevor!! (0.00)
Posted by Trevor Wilson on 2003-08-09, 02:27:57 (203.220.36.135)
Dunno Todd. I'll ask around on Monday. Trevor .......
14: General Asylum, Heheh.... (0.00)
Posted by Trevor Wilson on 2003-08-03, 01:15:37 (203.220.36.135)
...A few years ago, Conrad Johnson (I think) released two, otherwise identical amplifiers. They looked the same, sounded the same and measured the same. They were advertised on the same page of audio .......
15: Amp/Preamp Asylum, Of course not. (nt) (0.00)
Posted by Trevor Wilson on 2003-03-08, 22:37:53 (211.28.96.5)
. Trevor .......
16: Amp/Preamp Asylum, Forget the Perraux and.. (0.00)
Posted by Trevor Wilson on 2003-03-03, 11:21:35 (198.142.214.14)
...look for a Phase Linear 700B. Much better bass and slam. Of course, there are better amps than the PL too. They just cost more and are not as easy to obtain. Trevor .......
17: Amp/Preamp Asylum, Re: Trevor: A question for you (0.00)
Posted by Trevor Wilson on 2003-03-03, 02:13:59 (198.142.215.72)
Our ears work loarithmically. That is: They respond to sound in the form of 10log P1/P2. More simply, for each doubling of power, we perceive the sound as a little bit louder. A human requires 10 time .......
18: Amp/Preamp Asylum, Re: Does volume control position mean anything? (0.00)
Posted by Trevor Wilson on 2003-03-02, 13:18:00 (198.142.215.72)
Not really. A volume control is not a POWER CONTROL. Think of the volume control as analogous to an accelerator pedal in an automobile. The accelerator pedal does not control the speed of the auto (di .......
19: Amp/Preamp Asylum, Re: MOFSET amplifier? What is this? (0.00)
Posted by Trevor Wilson on 2003-02-27, 13:26:10 (198.142.215.201)
MOSFET = Metal Oxide Semiconductor Feild Effect Transistor. A MOSFET is a kind of transistor, but it exhibits different characteristics to those exhibited by regular transistors, which are called BJTs .......
20: Amp/Preamp Asylum, Don't muck about....., (0.00)
Posted by Trevor Wilson on 2003-02-27, 11:50:46 (198.142.215.201)
....take it to a guy who knows what they're doing. Trevor .......
21: General Asylum, Re: OT: External memory gizmo for downloading digital camera images - anyone first hand knowledge? (0.00)
Posted by Trevor Wilson on 2003-02-18, 11:36:00 (211.28.96.39)
Sure. Use the attached link. Do a category search for 'Computer Accessories' Then a sub-search for 'Memory Readers'. Look at the first entry. Trevor .......
22: Amp/Preamp Asylum, Sure.... (0.00)
Posted by Trevor Wilson on 2003-02-11, 13:24:58 (211.28.96.39)
..., here in Australia, we have a company called ME Sound, which has been building Zero Global NFB amplifiers since 1976. Most Aussie audiophiles know them well. They have been a high end bargain for .......
23: Amp/Preamp Asylum, Re: NAD 2200 Help (0.00)
Posted by Trevor Wilson on 2003-02-11, 11:19:52 (211.28.96.7)
The fault probably is due to poor relay contacts. Replace both relays. Trevor .......
24: Amp/Preamp Asylum, The SM2.... (0.00)
Posted by Trevor Wilson on 2003-02-11, 11:17:34 (211.28.96.7)
...makes an excvellent doorstop. Trevor .......
25: Propeller Head Plaza, Re: expanding hemispheres. (0.00)
Posted by Trevor Wilson on 2003-02-10, 12:59:46 (211.28.96.39)
I am unaware of this fact. Please post more details. Trevor .......
26: Propeller Head Plaza, Re: Parasound B-rail fuse size (0.00)
Posted by Trevor Wilson on 2003-02-03, 11:43:42 (211.28.96.37)
OK, first off, I don't know the correct fuse size for your amplifier. However, the fuse you have listed, is a 6.3 Amp TIME DELAY type. A time delay fuse is designed to absorb quite large transients, b .......
27: Propeller Head Plaza, Oh yeah, Tell Bill (0.00)
Posted by Trevor Wilson on 2003-02-02, 17:35:23 (211.28.96.5)
....I said G'day. You may have to refresh his memory. I'm a mate of Peter Stein, from ME Sound, in Australia. The last time we chatted, was in 'Vegas, over a Chinese meal, in '96. Trevor .......
28: Propeller Head Plaza, Re: It does not matter. (0.00)
Posted by Trevor Wilson on 2003-02-02, 14:18:14 (211.28.96.5)
If you want to see the only(?) pulsating hemispheric driver, look to the Audax HD-3P. Trevor .......
29: Propeller Head Plaza, Re: NEAR's not inverted Domes? (0.00)
Posted by Trevor Wilson on 2003-02-02, 14:16:47 (211.28.96.5)
Please do ask Bill. He will confirm what I have said. BTW: The NEAR tweeter is a stunning acheivement, IMO. As are the bass drivers. I own a pair of 10M-IIs. The difference between and inverted dome a .......
30: Propeller Head Plaza, It does not matter. (0.00)
Posted by Trevor Wilson on 2003-01-29, 14:19:43 (211.28.96.5)
At least, it shouldn't, as long as the dimensions of the dome (or inverted dome) are shorter than the shortest wavelength of the signal to be reproduced. HOWEVER, if we are talking about a puslating h .......
31: General Asylum, Some are, some... (0.00)
Posted by Trevor Wilson on 2003-01-26, 13:01:45 (211.28.96.5)
..aren't. When I manned a couple of 'Vegas shows, in the 90s, I found some of the press guys to be charming, helpful, polite and good fun. Some were full of their own self-importance. Trevor ::: TOPIC .......
32: General Asylum, Re: As the Bush inspired recession bites... (0.00)
Posted by Trevor Wilson on 2003-01-20, 23:58:12 (211.28.96.37)
Our economy was screwed by our politicians, back in the 90s. The US Dollar is falling, relative to most world economies. The Aussie Dollar is climbing. Mind you: We've got a long way to go. Back in th .......
33: General Asylum, As the Bush inspired recession bites... (0.00)
Posted by Trevor Wilson on 2003-01-20, 10:59:03 (211.28.96.5)
...deeper, prices will remain low for awhile, but, if his mis-management of the US economy continues, prices will probably rise. Trevor .......
34: Amp/Preamp Asylum, Re: Replacing 100watt Push-Pull amp with 20 watt SET (0.00)
Posted by Trevor Wilson on 2003-01-19, 21:36:51 (211.28.96.37)
The D115-II is an extremely accurate and nuetral amplifier. I know of no SET amp which could equal it, let alone surpass it. You could consider one of the ARC Classic series, or the VT series, as thes .......
35: General Asylum, Re: Nakamichi owners/service manuals (pdf format) (0.00)
Posted by Trevor Wilson on 2003-01-14, 11:25:06 (211.28.96.37)
How do you gain access? Trevor .......
36: General Asylum, Re: High Voltage amp? (0.00)
Posted by Trevor Wilson on 2003-01-14, 11:22:38 (211.28.96.37)
It has a switch on the back (as I recall), which allows operation into 8 Ohm loads (high Voltage) or 4 Ohm loads (high current). Naturally, a PROPER amplifier would not require such a kludge. Basicall .......
37: Amp/Preamp Asylum, Art Ludwig has grossly... (0.00)
Posted by Trevor Wilson on 2003-01-07, 12:06:07 (211.28.96.37)
...over-simplified the issue (I guess, since I have not read the article). There are many factors to be considered. * Loudspeaker efficiency. Obviously, for every 3dB of extra speaker efficiency, 3dB .......
38: Amp/Preamp Asylum, Re: Using 240v -> 120v Step Down Transformer with Amps (0.00)
Posted by Trevor Wilson on 2003-01-06, 11:40:37 (211.28.96.5)
None at all. Though, why you would bother importing, is a mystery. There's some very fine equipment manufactured here in Australia. Trevor .......
39: Propeller Head Plaza, D'oh! (0.00)
Posted by Trevor Wilson on 2003-01-05, 23:53:11 (211.28.96.37)
Of course that should read: "It makes sense to keep the non-inverting side at around the same impedance as the inverting side." AND: "A low source AND LOAD impedance can pay dividends in difficult sys .......
40: Propeller Head Plaza, Re: Question about amp input impedance (0.00)
Posted by Trevor Wilson on 2003-01-05, 20:40:06 (211.28.96.5)
Most solid state amplifiers use a differential pair, at the input stage. The positive (non-inverting) side of the diff amp is connected to the input of the amplifier. The negative (inverting) side of .......
41: Amp/Preamp Asylum, Re: I LOVE my ME850 (0.00)
Posted by Trevor Wilson on 2003-01-05, 17:37:55 (211.28.96.5)
Glad you like your ME850. If your ME850 is less than 7 years old (the model dates from 1988), then the specs are as follows: Power transformer - 2,500VA (continuous) Filter capacitance - 52 X 4,700uF .......
42: Amp/Preamp Asylum, Well, that is EXACTLY how Krell (and others) do it. (nt) (0.00)
Posted by Trevor Wilson on 2003-01-04, 12:56:03 (211.28.96.37)
. Trevor .......
43: Amp/Preamp Asylum, Re: High Current Amps - more questions (0.00)
Posted by Trevor Wilson on 2003-01-03, 14:01:12 (211.28.96.37)
J Harris wrote: "1. What are some examples of good high-current amps available right now?" *Krell, Mark Levinson, Plinius, ME and a bunch of others. "Plinius?" *Yep. "Ampzilla?" *Nope. "Can Class A am .......
44: General Asylum, Yep, but... (0.00)
Posted by Trevor Wilson on 2002-11-23, 12:39:48 (211.28.96.5)
...the original poster said nothing about fluid ounces, nor if he was interested in water. 6cc of water will weigh less than 6cc of mercury, f'rinstance. This is precisely why the Imperial measurement .......
45: General Asylum, I'll agree with the mass vs. weight thing, but, (0.00)
Posted by Trevor Wilson on 2002-11-22, 14:27:29 (211.28.96.5)
the original poster mentioned nothing about fluid ounces. In any case, it depends on the fluid. The whole Imperial system is so archane, I am at a loss as to why any intelligent people would bother wi .......
46: General Asylum, Not possible... (0.00)
Posted by Trevor Wilson on 2002-11-22, 13:13:27 (211.28.96.37)
....ounces are a measure of mass, whilst cubic centimetres are a measure of capacity. It's like asking: "How many Volts = an Amp?" Anyway, forget Imperial measurments. They're confusing, outdated, unn .......
47: Amp/Preamp Asylum, Did you jump on me? (0.00)
Posted by Trevor Wilson on 2002-11-19, 01:59:52 (211.28.96.5)
I don't remember. One of the joys of aging, is that I don't hold any grudges, because I can't remember who said anything nasty to me. :-) Trevor .......
48: Amp/Preamp Asylum, Re: Krell Questions: KSA-50s/100s (0.00)
Posted by Trevor Wilson on 2002-11-17, 19:44:23 (211.28.96.5)
There is simply no point in bothering with ANYTHING Stereophile has to say, when it expresses an opinion. Their measurements are competent and the pictures are adequate. That, is as far as it goes. AN .......
49: Amp/Preamp Asylum, Re: Krell Questions: KSA-50s/100s (0.00)
Posted by Trevor Wilson on 2002-11-17, 12:16:49 (211.28.96.5)
Why do you think that Stereophile is infallible? Form your own opinion. It is just as valid as Stereophile's. IMO, The KSA100 is a stunning amplifier. The KSA50 is over-rated. Trevor .......
50: General Asylum, Re: Sorry, some of these reules are not always correct. (0.00)
Posted by Trevor Wilson on 2002-11-17, 01:53:09 (211.28.96.37)
Ole wrote: "Please show me a single BJT that can do 100 Ampere cont and 300 Ampere peak like our single MOSFET do? Typical BJT in HiFi amps do 30 Amps cont." *Unnecessary. A bunch of properly matched .......
51: General Asylum, There's a bunch of reasons. (0.00)
Posted by Trevor Wilson on 2002-11-16, 18:16:03 (211.28.96.5)
Here's most of them: *The speakers in guitar amps NEVER need to handle low bass (lowest fundamental of a bass guitar is around 40Hz and we mostly only worry about the second harmonic). For lead guitar .......
52: General Asylum, Re: Sorry, some of these reules are not always correct. (0.00)
Posted by Trevor Wilson on 2002-11-14, 10:54:46 (211.28.96.5)
Ole wrote: "It is difficult to make general rules." Yep. But some things are not possible to argue. "Medium class A Bias is fine if there is only one device pr voltage rail, thus no matching problem. .......
53: Amp/Preamp Asylum, Re: What is dynamic headroom? (0.00)
Posted by Trevor Wilson on 2002-11-12, 14:03:36 (211.28.96.5)
Well, I've done a search on the Linn Klimax and I cannot find any reference to a 12dB Dh figure. On the contrary, with 290 Watts @ 8 Ohms and 500 Watts @ 4 Ohms, the DH figure is likely to be very low .......
54: Amp/Preamp Asylum, Nothing like it... (0.00)
Posted by Trevor Wilson on 2002-11-12, 13:41:30 (211.28.96.5)
.., Krell just vary the DC bias current. The rail Voltages remain static. Just as they should, in any decent amp. Trevor .......
55: General Asylum, Re: Why so few MOSFETS amps for the home and so many for the car... (0.00)
Posted by Trevor Wilson on 2002-11-12, 13:37:57 (211.28.96.5)
Then look for a SS technology which emulates what tubes do well. Some of the things which you might start looking for are: *High Class A bias levels *High linearity output devices (Not MOSFETs) *Large .......
56: Amp/Preamp Asylum, Whew! You've covered a lot of ground here. (0.00)
Posted by Trevor Wilson on 2002-11-12, 13:05:15 (211.28.96.5)
I'll do my best to assist. First off, I'm unfamiliar with the NAD models you mention. Having said that, I will make some comments about amplifiers, generally and NAD products specifically. Do NAD stil .......
57: Amp/Preamp Asylum, Re: Of course cost no object amps could have massive power supplies (0.00)
Posted by Trevor Wilson on 2002-11-12, 12:50:32 (211.28.96.5)
Rotel is not in the same class as Krell, Mark Levinson, ME, Plinius, et al. Neither is Carver and Sunfire. Nor Rotel and NAD. My point was that while NAD mucked around with dodgy technology (Power Env .......
58: Amp/Preamp Asylum, I know the Threshold 400A and it's Dynamic Headroom was... (0.00)
Posted by Trevor Wilson on 2002-11-12, 11:46:22 (211.28.96.5)
... was much less than 1dB. All REALLY GOOD amplifiers have very low DH figures. Thank you for proving my point. Trevor .......
59: General Asylum, Re: Why so few MOSFETS amps for the home and so many for the car... (0.00)
Posted by Trevor Wilson on 2002-11-12, 11:42:14 (211.28.96.5)
MOSFETs are a great way to produce cheap, stable, reliable high powers. Unless used in high Class A bias amplifiers, they don't sound as good (accurate) as a properly designed BJT amplifier. There are .......
60: Amp/Preamp Asylum, Like I said,.... (0.00)
Posted by Trevor Wilson on 2002-11-12, 00:25:16 (211.28.96.5)
....no REALLY high end amps use rail shifting schemes. A whole bunch of 'also rans' do, however. Thanks for proving my point. Trevor .......
61: Amp/Preamp Asylum, I disagree, (0.00)
Posted by Trevor Wilson on 2002-11-11, 19:19:42 (211.28.96.37)
...I believe it is majorly (majorly?) responsible for the gradual rejection of NAD products, by those who once thought highly of them. As I previously stated, I sold NAd products during the early to m .......
62: Amp/Preamp Asylum, Re: Oops, too, the 3020 provided +3dB headroom (0.00)
Posted by Trevor Wilson on 2002-11-11, 19:09:17 (211.28.96.5)
Sure. The 2155 did not use the PE circuitry. It was just a decent little (55 Watt rated) power amp. As for the 3020, your figures are probably correct. As I recall, the 3020 was a 35 Watt (rated at 20 .......
63: Amp/Preamp Asylum, Whoops, 2200, of course. (0.00)
Posted by Trevor Wilson on 2002-11-11, 17:38:15 (211.28.96.5)
Still a crappy sounding amp though. Back in the 80s, I sold some. They were the only amp which could destroy KEF 14.2 tweeters. Sure they went loud, but they had no finesse or style. Although they did .......
64: Amp/Preamp Asylum, The NAD 3020 did NOT possess... (0.00)
Posted by Trevor Wilson on 2002-11-11, 16:19:35 (211.28.96.5)
...6dB of DH. The first NAD amp to accomplish that figure was the terrible 2100 power amp. Whilst I have not measured a 3020 in quite some time, I would expect a figure of around 2dB DH would be about .......
65: Amp/Preamp Asylum, A measure of how BAD an amplifier is. (0.00)
Posted by Trevor Wilson on 2002-11-11, 14:40:11 (211.28.96.5)
Poor power supply regulation, leads to high DH figures. High quality power supply regulation (ie: Big transformers, lots of filter caps, etc), leads to low DH figures. Look at all the top line amplifi .......
66: General Asylum, Re: starting transients (attacks) and decxays (0.00)
Posted by Trevor Wilson on 2002-11-11, 14:35:52 (211.28.96.37)
Quite right about the ultrasonic alarms, John. Back in the 70's, I had pretty sensitive hearing. When I walked down the road to the warehouse at the company which I worked (Marantz Australia), I found .......
67: Amp/Preamp Asylum, No,... (0.00)
Posted by Trevor Wilson on 2002-11-10, 12:45:23 (211.28.96.37)
....the important stuff (in approximate order of importance) is: 1) Output impedance. The lower, the better. One or two Ohms is nice. 2) Gain. The actual number is relatively unimportant, as long as m .......
68: General Asylum, Why worry, (0.00)
Posted by Trevor Wilson on 2002-11-01, 00:51:18 (211.28.96.5)
...it's a completely arbtrary system, anyway. It is open to all sorts of misinterpretation. Just ignore the whole thing and trust your own ears. Trevor .......
69: Amp/Preamp Asylum, Not even in the same league as Plinius, IMO. (0.00)
Posted by Trevor Wilson on 2002-10-31, 12:50:30 (211.28.96.5)
Perreaux products have always concentrated on image and style, rather than substance and engineering. Nothing seems to have changed in their latest equipment. The (poor) use of MOSFETs ensures that th .......
70: Amp/Preamp Asylum, You have a good memory. (0.00)
Posted by Trevor Wilson on 2002-10-25, 15:32:22 (211.28.96.37)
The inputs and outputs were duplicated on the front panel as well. I must rebuild me 500 one day. I may install more up to date circuitry in it as well. It does look kinda cool. Dunno what I'll do wit .......
71: Amp/Preamp Asylum, What you have is a Marantz 510,....... (0.00)
Posted by Trevor Wilson on 2002-10-25, 13:59:06 (211.28.96.37)
....or 510M. The 500 was an amazing, beautiful and superb sounding beast. It was also horribly unreliable. Only 300 were ever made. To paraphrase The Absolute Sound, when they reviewed the Marantz 500 .......
72: General Asylum, Nope (0.00)
Posted by Trevor Wilson on 2002-10-22, 17:09:09 (211.28.96.5)
Decreasing the capacitance merely INCREASES the inductance. By increasing cable inductance, you will decrease high frequencies (very subtly, in most systems). BASS FREQUENCIES AND MID FREQUENCIES WILL .......
73: General Asylum, Absolute and utter nonsense.... (0.00)
Posted by Trevor Wilson on 2002-10-22, 15:22:38 (211.28.96.5)
..., you're imagining the effects you describe. Reducing the capacitance INCREASES the inductance. Decreasing capacitance will have no effect, whatsoever. Increasing inductance will decrease HF. Do a .......
74: Amp/Preamp Asylum, Not necessarily. (0.00)
Posted by Trevor Wilson on 2002-10-20, 13:26:27 (211.28.96.37)
An amplifier with lots of output devices may exhibit a low output impedance, without the use of lots of Global Negative Feedback. Trevor .......
75: General Asylum, This stuff is speaker cable, right? (0.00)
Posted by Trevor Wilson on 2002-10-20, 13:22:07 (211.28.96.37)
Then is doesn't matter one whit. All properly designed amplifiers will cope with highly capacitive loads, with no problems (forget Naim, though). Moreover, the reason why some cables are highly capaci .......
76: General Asylum, Don't muck about, use WIN2k. (0.00)
Posted by Trevor Wilson on 2002-10-13, 02:42:39 (211.28.96.37)
It is stable and fast. The only time I have ever had to reboot, is when I do something really dumb, like opening lots and lots of memory hogging programmes. Trevor .......
77: Amp/Preamp Asylum, Re: Follow-up question to high-current thread below... (0.00)
Posted by Trevor Wilson on 2002-10-10, 22:42:16 (211.28.96.37)
Because, in the real world, NO AMPLIFIER can exactly double its maximum power output, into successively lower impedances. There must always be some kind of loss, when dealing with output devices and r .......
78: Amp/Preamp Asylum, Re: Follow-up question to high-current thread below... (0.00)
Posted by Trevor Wilson on 2002-10-10, 16:01:43 (211.28.96.5)
John wrote: "Amp 1: 80 watts into 8 ohms and 160 watts into 4 ohms Amp 2: 150 watts into 8 ohms and 200 watts into 4 ohms" Amp 1 cannot exist, in the real world. Trevor .......
79: Amp/Preamp Asylum, Yes (nt) (0.00)
Posted by Trevor Wilson on 2002-10-10, 15:57:52 (211.28.96.5)
. Trevor .......
80: Amp/Preamp Asylum, Maybe, maybe not. (0.00)
Posted by Trevor Wilson on 2002-10-08, 16:02:10 (211.28.96.5)
There are a raft of issues, which need to be considered. The first, most basic, one, relates to how much current is actually required by the speakers which are to be connected to the amplifier. If the .......
81: General Asylum, Re: Trevor.... (0.00)
Posted by Trevor Wilson on 2002-09-23, 13:55:48 (211.28.96.37)
Good to hear you're still enjoying the Infinitys. Do you still have your Odyssey? Trevor .......
82: General Asylum, Whilst not a current model..... (0.00)
Posted by Trevor Wilson on 2002-09-21, 22:03:06 (211.28.96.37)
...., the Infinity Kappa 9 is pretty nasty. Serious amplifiers may only apply. Trevor .......
83: Amp/Preamp Asylum, Re: Class A preamps?? (0.00)
Posted by Trevor Wilson on 2002-09-18, 02:41:30 (211.28.96.37)
Almost all preamps operate in Class A. The amount of Class A, which an amplifier delivers, is related to the amount of current it can source into a specific load. A Class A power amplifier may be requ .......
84: General Asylum, Whatever you do,.... (0.00)
Posted by Trevor Wilson on 2002-09-10, 01:25:27 (211.28.96.37)
...make sure your amplifier can cope with low impedance loads. Those Kappa 9s are SERIOUSLY hungry speakers. Here is the impedance plot..... Trevor .......
85: General Asylum, Of course it can, as long as...... (0.00)
Posted by Trevor Wilson on 2002-09-09, 02:47:12 (211.28.96.5)
.....you don't mind: *Causing needless power consumption and the consequent influence on the environment. *Accelerating the wear on various components (particularly electrolytic capacitors), due to he .......
86: General Asylum, Re: marantz 1120 circuit (0.00)
Posted by Trevor Wilson on 2002-09-09, 02:43:07 (211.28.96.5)
On its way. Trevor .......
87: General Asylum, Re: internal electronics damage (0.00)
Posted by Trevor Wilson on 2002-09-08, 15:55:09 (211.28.96.37)
Answers: 1) Absolutely! Critters can do damage to equipment with their faeces and urine. Keep them out. DO NOT use bug spay! Bug spray is even worse than the critters. 2) Relationships are tricky. I c .......
88: General Asylum, Re: Why would a warm wire sound better than a cold one... (0.00)
Posted by Trevor Wilson on 2002-09-07, 23:40:08 (211.28.96.37)
Global NFB tends to make an amplifier sound te same, regardless of whether it is cold or warm. Amplifiers which have none or very little Global NFB, may, indeed, require a warm up period. Regardless o .......
89: General Asylum, You'll get get no argument from me... (0.00)
Posted by Trevor Wilson on 2002-09-03, 03:41:48 (211.28.96.39)
...about Class D amplifiers and MOSFETs. They are destined to rule. I'm doing battle with Amazon, at present to obtain the book. Thanks for the tip. Trevor .......
90: General Asylum, Re: The facts are needed (0.00)
Posted by Trevor Wilson on 2002-09-02, 20:45:25 (211.28.96.37)
Points: #1 I disagree. However, IF the bias issue is attended to, then I agree. MOSFETs are capable of exceptional performance. Witness the Pass X series. Trouble is, it can all be done better, cooler .......
91: General Asylum, If you're going to quote, then..... (0.00)
Posted by Trevor Wilson on 2002-09-02, 20:37:02 (211.28.96.5)
.....please quote in context. You did it right the first time. I stand by my statement and the one in the whitepaper (which, you'll note, is FAR from complete). The only seriously good MOSFET amplifie .......
92: General Asylum, Re: I question your credibility because..... (0.00)
Posted by Trevor Wilson on 2002-09-02, 14:37:15 (211.28.96.5)
You question my credibility because I am honest enough to state my position? Curious. Had I contributed as an annonymous contributor, then my words would have carried more weight? Curious. If you want .......
93: General Asylum, Re: An audiophile's dream amp? (0.00)
Posted by Trevor Wilson on 2002-09-02, 14:31:53 (211.28.96.37)
You're still beating that MOSFET drum, eh? Just as the guys who build BJT amps, will rave about how good BJTs are, so will the MOSFET builders rave about how good MOSFETs are. What you need to do is t .......
94: Amp/Preamp Asylum, Re: so what makes an amplifier "fast" (0.00)
Posted by Trevor Wilson on 2002-09-02, 02:25:58 (211.28.96.37)
A rolled-off bass response, combined with typical SS damping factor. Trevor .......
95: General Asylum, I'm not sure where to start, in debunking thins nonsense... (0.00)
Posted by Trevor Wilson on 2002-09-02, 02:18:39 (211.28.96.5)
..., however, I'll give it a go. waVeman wrote: "Using boutique manfacturers to prove technical points probably isn't in anybody's self-interest, considering so many probably have small budgets for R& .......
96: General Asylum, None. -:) (0.00)
Posted by Trevor Wilson on 2002-09-01, 19:20:12 (211.28.96.5)
Why restrict yourself to one technology? With only one of two (mostly very high Class A bias) exceptions, all high end power amps avaialable today, use BJTs (Bipolar Junction Transistors). Krell, Plin .......
97: General Asylum, Agreed (0.00)
Posted by Trevor Wilson on 2002-08-30, 15:05:12 (211.28.96.37)
I think Brassmonkey has summed up my approach. It is not the way to fame and fortune, but you can sleep nights. Trevor .......
98: Amp/Preamp Asylum, For the record:.... (0.00)
Posted by Trevor Wilson on 2002-08-27, 16:48:43 (211.28.96.37)
....there is a WHOLE LOT MORE sand, in a tube amp, than there is in any SS amp. In fact, there's more sand in ONE 12AU7, than a couple of dozen big output transistors. It is therefore appropriate to r .......
99: General Asylum, I was restricting my comments to the Nuvista products, (0.00)
Posted by Trevor Wilson on 2002-08-27, 01:06:51 (211.28.96.5)
...but, since you asked, the brief listen I had to an A3CR suggested a pretty decent amplifier. The Nuvista power amplifier/s I've heard, were the Model 300s. They were extremely ordinary, in comparis .......
100: General Asylum, No war,but read my comments more carefully, please. (0.00)
Posted by Trevor Wilson on 2002-08-26, 13:21:43 (211.28.96.37)
I did not say that SP were liars. They mrerely repeated the hyperbole published by MF. And hyperbole is just that: Advertising propaganda. Moreover, it is *possible* that a Nuvistor *could* last 100,0 .......
101: General Asylum, What is with you guys and dust? (0.00)
Posted by Trevor Wilson on 2002-08-25, 23:08:31 (211.28.96.37)
After all, like the tree falling in the forest, if you can't see the dust, then it isn't there. Am I missing something? Trevor .......
102: General Asylum, Re: 100.000 hours: I copy a part of the Stereophile review (0.00)
Posted by Trevor Wilson on 2002-08-25, 19:38:47 (211.28.96.5)
So far, you have not provided any proof that a Nuvistor will last anything like 100,000 hours. What is more, I use test equipment which uses the same Nuvistors that MF use. They do not last anything l .......
103: General Asylum, Don't bother... (0.00)
Posted by Trevor Wilson on 2002-08-25, 16:57:50 (211.28.96.5)
...since, before I lived with my present partner, I discovered an interesting sicentific FACT. Dust will only accumulate to a level equal to the 3 years thickness. Amazingly enough, after 10 (or 20, 3 .......
104: General Asylum, You're welcome (nt) (0.00)
Posted by Trevor Wilson on 2002-08-25, 16:22:49 (211.28.96.5)
. Trevor .......
105: General Asylum, Why do you find it strange?...... (0.00)
Posted by Trevor Wilson on 2002-08-25, 14:02:08 (211.28.96.5)
After all, MF is a company with no actual direction, as regards the best way to build audio equipment. Over the years, they have embraced various technologies, which they claim to provide the best in .......
106: General Asylum, Why do you imagine that everything SP says is.... (0.00)
Posted by Trevor Wilson on 2002-08-25, 13:39:02 (211.28.96.37)
...is correct, or even makes any sense? I've listened to the MF Nuvista power amps, several times. Compared with other products, in similar price ranges (Krell, Mark Levinson, Bryston, ME, Plinius, et .......
107: General Asylum, Re: Musical Fidelity NU-VISTA preamp (0.00)
Posted by Trevor Wilson on 2002-08-24, 15:21:07 (211.28.96.5)
First off: The tube, itself is called a 'Nuvistor'. The MF product is called a Nuvista. Second off: Just like all hi fi products, Nuvista products fall in value, as soon as they leave the dealer's sho .......
108: General Asylum, Re: glowing red lights in Sony TA-F808ES intergrated amp (0.00)
Posted by Trevor Wilson on 2002-08-24, 02:24:27 (211.28.96.5)
They're LEDs. Light Emitting Diodes. They are generally used as a Voltage reference, instead of a zener diode. They're used because they cause less noise in an audio cicuit than a zener diode causes. .......
109: General Asylum, A false premise..... (0.00)
Posted by Trevor Wilson on 2002-08-23, 13:25:40 (211.28.96.37)
.....is a bad way to build a system. There's good tube amps and bad tube amps, just as there are good SS amps and bad SS amps. Evaluate the products and choose the most accurate products, without rega .......
110: General Asylum, Re: Bound for Sound - comment? (0.00)
Posted by Trevor Wilson on 2002-08-22, 01:32:39 (211.28.96.5)
Absolutely! Make certain you read the copywrite notice. Trevor .......
111: General Asylum, You cannot generalise.... (0.00)
Posted by Trevor Wilson on 2002-08-16, 14:35:20 (211.28.96.5)
...without understanding the requirements of your system. Mostly your speakers. If your speakers present a difficult load, then you may need to allocate more resources on a robust output stage, than a .......
112: General Asylum, Re: Point taken. (0.00)
Posted by Trevor Wilson on 2002-08-10, 14:44:18 (211.28.96.37)
It seems that you and I have interpreted audioheaven's post in exactly the same way. I look forward to seeing audioheaven's response to my comments. Trevor .......
113: General Asylum, I'd take the river water. nt (0.00)
Posted by Trevor Wilson on 2002-08-10, 03:51:36 (211.28.96.5)
. Trevor .......
114: General Asylum, YIKES! (0.00)
Posted by Trevor Wilson on 2002-08-10, 02:55:38 (211.28.96.5)
Whaddya doing drinking XXXX???!!! You're a Sydney-sider! Drink something decent. That'll learn me. I should check out the people BEFORE I insult them. Actually, I have no idea how good or bad XXXX is. .......
115: General Asylum, Re: lol! (0.00)
Posted by Trevor Wilson on 2002-08-10, 01:24:52 (211.28.96.37)
I dunno about that. You're a Queenslander, right? 'Nuff said. Trevor .......
116: General Asylum, Hah! You know why Queenslanders drink XXXX? (0.00)
Posted by Trevor Wilson on 2002-08-10, 01:05:09 (211.28.96.37)
Because they can't spell BEER. XXXX is dreadful stuff. Worst beer on the planet. Trevor .......
117: General Asylum, Re: Speakers too power-hungry for amp? (0.00)
Posted by Trevor Wilson on 2002-08-09, 21:36:02 (211.28.96.37)
You shouldn't have a problem. HK amps tend to be able to cope with 4 Ohm loads better than most mass market brands. They also run a little more bias current and will run a little warmer than most. As .......
118: General Asylum, Re: Trevor, I think you missed my point. I was giving Frank the raspberries. (nt) (0.00)
Posted by Trevor Wilson on 2002-08-09, 02:45:48 (211.28.96.5)
Well, I thought Frank's post was constructive, helpful and (mostly) accurate. I dissagreed with part of it, but that is the way of the world. If we all thought the same, this place would be dreadfully .......
119: General Asylum, Re: You don't know... (0.00)
Posted by Trevor Wilson on 2002-08-09, 02:43:53 (211.28.96.5)
I am subject to all the rules, on this, a moderated forum. I try to remain within those rules. In fact, as a dealer, I am subject to much more stringent rules than a 'regular' poster (or one who CLAIM .......
120: General Asylum, Sort of, but not quite. (0.00)
Posted by Trevor Wilson on 2002-08-09, 01:55:00 (211.28.96.37)
Whilst I agree with the need for an intelligent and sustained marketing machine, to extablish a product in the US, I dissagree about the influence of Stereophile on the chances of a product (from 1995 .......
121: General Asylum, Re: Just some surprise ... (0.00)
Posted by Trevor Wilson on 2002-08-08, 23:13:08 (211.28.96.37)
Not at all. The previous poster invited the response I sent. As always, I just state the facts. Nothing more, nothing less. Trevor .......
122: General Asylum, Discontinued amplifiers. (0.00)
Posted by Trevor Wilson on 2002-08-08, 17:05:11 (211.28.96.5)
No need to worry. Although the ME1400 and ME1500 have been discontinued, Peter is developing replacements, which will provide superior performance, enhanced cosmetics (not difficult with the ME1400!) .......
123: General Asylum, Re: Just some surprise ... (0.00)
Posted by Trevor Wilson on 2002-08-08, 16:44:18 (211.28.96.37)
audiohaven wrote: "I just peaked through their website. The specification of ME850 says the input impedence = 2000 Ohms (balanced). Now, what kind of amplifier is that ?" *A bloody good one. "Any da .......
124: General Asylum, Re: Actually in this case, it's probably okay... (0.00)
Posted by Trevor Wilson on 2002-07-22, 02:33:54 (211.28.96.37)
I don't mind the big Plinius. It's actually quite good. I'm not as excited about the little stuff, though. Trevor .......
125: General Asylum, Re: Plinius integrated amps, Questions (0.00)
Posted by Trevor Wilson on 2002-07-21, 20:45:15 (211.28.55.67)
Judging one amplifier, based on a listening test of another amplifier (even the same brand) may not be prudent. You should listen to your selection BEFORE you purchase. You should also include a wide .......
126: General Asylum, Re: simple technical question(ohm value) (0.00)
Posted by Trevor Wilson on 2002-07-17, 19:25:09 (211.28.96.37)
39,000 Ohms. Trevor .......
127: Outside Asylum, Don't muck about, use WIN2k. (nt) (0.00)
Posted by Trevor Wilson on 2002-07-15, 16:17:57 (211.28.96.37)
. Trevor .......
128: General Asylum, Taps, who mentioned taps? (0.00)
Posted by Trevor Wilson on 2002-07-14, 19:04:39 (211.28.96.5)
Attempting to operate an amplifier, which uses an output transformer into a 1 Ohm load, would be futile. The impedance of the transformer would be too high. Otherwise, with any reasonable Voltage sour .......
129: General Asylum, All of them....... (0.00)
Posted by Trevor Wilson on 2002-07-14, 15:14:53 (211.28.96.5)
...It just depends on what power level is quoted. An amplifier which delivers (say) 10 Watts Class A, at 8 Ohms, will deliver 1.25 Watts Class A, at 1 Ohm. Trevor .......
130: General Asylum, Re: Perreaux 3150 Power Amp (0.00)
Posted by Trevor Wilson on 2002-07-13, 17:01:07 (211.28.96.37)
The 3150B is slow, mushy, screws up the dynamics and lacks detail. It is powerful, though. If you want a superior sound, then look towards a decent, old Bipolar amp. Old MOSFET amps, which run low lev .......
131: General Asylum, Re: What makes for good dynamics? (0.00)
Posted by Trevor Wilson on 2002-07-11, 02:48:56 (211.28.96.37)
IME, with amplifiers, it is the abscence of Global NFB. With speakers, it is the ability of the speaker voice coil (if used) to remain at a constant, low temperature. Trevor .......
132: General Asylum, Re: So doesn't this challenge Trevor's comments. (0.00)
Posted by Trevor Wilson on 2002-07-09, 02:04:09 (211.28.96.37)
Nope. Class A operation will almost always help a lesser amplifier. A properly designed amplifier will not benefit. In fact, as shown by Self, it will damage performance (though possibly not audibly). .......
133: General Asylum, Re: Solid State Class A output stage power amps.. (0.00)
Posted by Trevor Wilson on 2002-07-08, 13:29:08 (211.28.96.5)
My main amp is an ME1500. (Adjustable Class A, from 1 Watt to 100 Watts) Class B to 220 Watts. Next down the list if the ME850. 16 Watts Class A. Class B to 120 Watts. Another system uses an ME550-II. .......
134: General Asylum, Re: Solid State Class A output stage power amps.. (0.00)
Posted by Trevor Wilson on 2002-07-08, 02:27:09 (211.28.96.5)
skady wrote: "Thanks Trevor. I understand your POV. Regarding Class A amps having higher distortion than well designed AB amps, I think this may have no real effect on final sound since tube amps in g .......
135: General Asylum, Re: Solid State Class A output stage power amps.. (0.00)
Posted by Trevor Wilson on 2002-07-08, 00:54:15 (211.28.96.37)
Which amp do you have? Trevor .......
136: General Asylum, Re: Solid State Class A output stage power amps.. (0.00)
Posted by Trevor Wilson on 2002-07-07, 16:36:10 (211.28.96.5)
skady wrote: "Class A amps are supposed or are regarded to offer lower distortion than other amp designs and are therefore more capable of producing better pinpoint imaging, better tonal transparency, .......
137: General Asylum, The average lifespan of a rock and roll artist is..... (0.00)
Posted by Trevor Wilson on 2002-06-28, 01:43:13 (211.28.55.67)
...37. It seems John has done pretty well. Trevor .......
138: General Asylum, Re: clipping question (0.00)
Posted by Trevor Wilson on 2002-06-23, 21:30:57 (211.28.96.5)
It won't hurt your amplifier, at all. If you're running the resultant signal through guitar speakers, then you will not experience any problems. Hi fi speakers are another matter, entirely. They may b .......
139: Tweakers' Asylum, Re: Best Aussie plug. Which is it? (0.00)
Posted by Trevor Wilson on 2001-12-22, 23:02:35 (61.9.192.140)
There are two major brands, in Australia. HPM and Clipsal. Choosing one over the other is a religious decision. Both are made in Australia and are excellent quality. I prefer HPM. You might consider u .......
140: General Asylum, Lee De Forest. (0.00)
Posted by Trevor Wilson on 2001-12-18, 18:21:08 (61.9.192.140)
Without him, we would still be using mechanical reproduction systems. Trevor .......
141: General Asylum, With Warren Zevon,.... (0.00)
Posted by Trevor Wilson on 2001-12-15, 12:38:27 (203.27.69.93)
...you get both. Trevor .......
142: General Asylum, So many errors, so little time. (0.00)
Posted by Trevor Wilson on 2001-12-14, 12:52:42 (61.9.192.140)
Tube amps (particuarly triodes) use huge amounts of NFB. What is different, between most tube amps and most SS amps, is that MOST SS amps use large amounts of GLOBAL NFB. A subtle, but important disti .......
143: Tweakers' Asylum, The only major difference between Hovland caps and Solen caps is..... (0.00)
Posted by Trevor Wilson on 2001-12-11, 11:27:27 (61.9.192.140)
....a 2000% price difference. At the ridiculous prices demanded for Hovland caps, I would suggest that a DBT is in order. Trevor .......
144: General Asylum, Re: Anyone hear the Perreaux E160i integrated amp? (nt) (0.00)
Posted by Trevor Wilson on 2001-12-09, 01:06:11 (61.9.192.140)
The Class A moniker is just advertising hype. Nearly all preamps are operated in Class A. Excessive heat generation, is just incompetent design. Trevor .......
145: General Asylum, Re: I beg to differ. (0.00)
Posted by Trevor Wilson on 2001-12-03, 19:28:55 (61.9.192.140)
In a noisy environment, balanced lines will help with noise rejection. That's about it, though. In any case, using a low output impedance, plus a low input impedance, for unbalanced lines, will solve .......
146: General Asylum, Re: Depends, balanced or single ended? nt (0.00)
Posted by Trevor Wilson on 2001-12-03, 10:32:49 (61.9.192.140)
It makes no difference whether it is single ended, or balanced. The critical factors are: *Output impedance of the source. *Capacitance of the cable. Trevor .......
147: General Asylum, Re: Replacing wall wart with big toroid- benefits? (0.00)
Posted by Trevor Wilson on 2001-11-28, 14:52:09 (61.9.192.140)
Toroidals, of any size, are not necessarily superior to EI and other types of transformers. Toroidals tend to be very closely coupled and thus allow interference through the power supply, more readily .......
148: General Asylum, Agreed (nt) (0.00)
Posted by Trevor Wilson on 2001-11-27, 11:19:30 (61.9.192.140)
. Trevor .......
149: Tweakers' Asylum, Re: Are these output devices any good? (0.00)
Posted by Trevor Wilson on 2001-11-25, 11:44:18 (203.27.69.93)
2SA1302/2SC3281 devices are excellent. Very, very linear. However, these devices are a few years old and there are even better devices now available. Trevor .......
150: General Asylum, Nonsense. (0.00)
Posted by Trevor Wilson on 2001-11-18, 21:11:14 (61.9.192.140)
The US will have embraced SI units, like 95% of the rest of the world, by then. Miles Per Hour, indeed! Trevor .......
151: General Asylum, Re: Krell KSA250 - Costly to run? (0.00)
Posted by Trevor Wilson on 2001-11-17, 12:35:00 (61.9.192.140)
Just look at the rated power consumption. It will be in the handbook, or the advertising material. BTW: The KSA250 is not pure Class A. Trevor .......
152: General Asylum, Re: Amplifier stability: Jon Risch, John Curl, Victor Khomenko, Steve Eddy, etc... (0.00)
Posted by Trevor Wilson on 2001-11-17, 01:48:00 (61.9.192.140)
Sean wrote: "With that in mind, how can one tell if an amp would be considered "stable" or "unstable" ? By "stable", i'm not just talking about dealing with various levels of reactance, but maintainin .......
153: General Asylum, Re: No (0.00)
Posted by Trevor Wilson on 2001-11-12, 13:31:55 (61.9.192.140)
Sean wrote: "Here you say that amps that use large levels of global NFB require an output inductor to remain stable with low inductance / high capacitance loads." That is correct. Sensible designers w .......
154: General Asylum, No (0.00)
Posted by Trevor Wilson on 2001-11-11, 11:42:40 (203.27.69.94)
Sean wrote: "As others have mentioned, it is due to the capacitive reactance that the Goertz cables generate when hooked up into a system." *Not necessarily. The total capacitance of the Goertz cable, .......
155: Tweakers' Asylum, Re: Just picked up a Tek 475 O-Scope... looking for probes. (0.00)
Posted by Trevor Wilson on 2001-11-03, 19:11:30 (61.9.192.140)
Look for used Tek probes. Nothing better. Trevor .......
156: Tweakers' Asylum, Re: Takamisawa? (0.00)
Posted by Trevor Wilson on 2001-10-28, 14:50:14 (61.9.192.141)
It is a relay. Yes, you can replace it with a better quality component. First off, you need to determine exactly what your relay is. If it is hermetically sealed and uses gold plated contacts, then yo .......
157: Outside Asylum, What nonsense! (0.00)
Posted by Trevor Wilson on 2001-09-16, 18:19:06 (61.9.192.141)
Don T wrote: "I said I had sympathy for the cause of the Palestinians. I no longer do and will never again in my life." * Why? Because they are upset that Sharon is throwing them off their lands? How .......
158: Outside Asylum, Re: So If Sharon is a Bastard...what does that make Arafat? (0.00)
Posted by Trevor Wilson on 2001-09-16, 18:10:08 (61.9.192.141)
Reasonable steps towards peace were being made, before Barak came to power. Barak was a weak leader, who pandered to the right wing warmongers. Sharon is worse. Much worse. I don't agree with ANY terr .......
159: Outside Asylum, Are you SERIOUS?!?! (0.00)
Posted by Trevor Wilson on 2001-09-16, 16:27:33 (61.9.192.141)
Evidence suggests that one man financed and planned this action, yet you advocate the indiscrinimate use of nuclear weapons, which will likely kill millions. Where was Ted Bundy born? Do you advocate .......
160: Outside Asylum, Well, the OJ reference was a poor one,.... (0.00)
Posted by Trevor Wilson on 2001-09-16, 14:35:11 (61.9.192.141)
...Since there is adequate evidence to suggest that OJ was not guilty. It was most likely his son, who committed the murders. Moreover, the police investigation was utterly inept. As long as the FBI d .......
161: General Asylum, Re: So what are sonic effects of mismatching... (0.00)
Posted by Trevor Wilson on 2001-09-09, 03:13:13 (61.9.192.141)
Very probably. Moreover, I have found that image HEIGHT is one of the image characteristics, which fails, when input/output impedances are not favourable. BTW: A 1,000 Ohm ouptut impedance is (IMO) co .......
162: General Asylum, Re: So what are sonic effects of mismatching... (0.00)
Posted by Trevor Wilson on 2001-09-08, 00:48:21 (61.9.192.141)
The effects could vary, from poor imaging, to gross distortion and frequency reponse errors, or anything in between. Bottom line: A decent preamp should ALWAYS possess a low output impedance, thus any .......
163: General Asylum, Re: Technical wizard question...matching pre amps and amps (0.00)
Posted by Trevor Wilson on 2001-09-07, 21:55:08 (61.9.192.141)
The general rule of thumb with any input impedance : output impedance ration, is around 10:1 MINIMUM. In general, I like to keep that ratio to at least 100:1. So, if an amplifier posesses an input imp .......
164: General Asylum, Re: dynamic headroom question (0.00)
Posted by Trevor Wilson on 2001-09-07, 16:15:30 (61.9.192.141)
At full power, an amplifier has nothing in reserve. It is already expending all available Voltage. At RATED power, an amplifier may have some Voltage left, which could be termed Dynamic Headroom. Many .......
165: General Asylum, Oh yeah, I forgot... (0.00)
Posted by Trevor Wilson on 2001-09-06, 20:07:30 (61.9.192.141)
..to mention that BJTs are available in almost perfectly mirror imaged devices (PNP & NPN), whereas the complementary MOSFET devices available, exhibit quite different characteristics. Trevor ::: TOPI .......
166: General Asylum, Re: mosfet versus bipolar amplifiers (0.00)
Posted by Trevor Wilson on 2001-09-06, 20:02:17 (61.9.192.141)
Sam P wrote: "What is the main benefit of Mosfet designs?" *Good performance, with relatively simple circuitry. BJTs require (slightly) more money to be spent on thermal and over-current protection sy .......
167: General Asylum, Nope. (0.00)
Posted by Trevor Wilson on 2001-09-04, 13:54:23 (61.9.192.141)
In general, *ANY* line level, or phono level device, may be operated without a load, in complete safety. As well, most SS power amps, may be operated without a load connected and most tube power amps, .......
168: General Asylum, Re: GAS Son of Ampzilla Boat Anchor! Enjoy (0.00)
Posted by Trevor Wilson on 2001-09-02, 12:41:12 (61.9.192.141)
The Son of and the Grandson were the standout products, in the GAS range, IMO. Excellent sound quality and much more reliable than the Ampzilla, or the GAS 500. Trevor .......
169: Tweakers' Asylum, Re: Australian electrical suppliers (0.00)
Posted by Trevor Wilson on 2001-08-28, 03:23:59 (61.9.192.141)
Pop into your local hospital. You will note that they use standard HPM, or Clipsal products, which are available from your local electrical wholesaler (no, not the hardware store). Even better, ask th .......
170: Tweakers' Asylum, ABSOLUTELY (0.00)
Posted by Trevor Wilson on 2001-08-25, 21:05:39 (61.9.192.141)
Perth's poor power is legendary. When I was service manager for Marantz (Australia), Perth represented around 10% of the Marantz (Aust) market. Their spare parts demand was around 60%. Scarey, when yo .......
171: Tweakers' Asylum, You don't need 'em. (0.00)
Posted by Trevor Wilson on 2001-08-24, 19:15:45 (61.9.192.141)
Australia has the highest electrical standards on the planet. Regular AUSTRALIAN made components are all you need. Further, our operating Voltage (240VAC) reduces the impact of the problems associated .......
172: General Asylum, Re: Nakamichi BX-150 tape deck for $30! Advice needed... (0.00)
Posted by Trevor Wilson on 2001-08-21, 15:07:17 (61.9.192.141)
Capstan belt, idler, or capstan motor (in that order). None of which will be overly difficult, or expensive. NB: Don't buy Naka motors. Third party ones, will work just fine. Trevor .......
173: General Asylum, Re: But did anyone audition the Chinese amp? (0.00)
Posted by Trevor Wilson on 2001-08-20, 16:04:22 (61.9.192.141)
Whilst there is nothing criminal about Red Rose's apparent re-labelling of imported products (after all, many US manufacturers have done precisely that, over the years), contained within the web site .......
174: General Asylum, Re: Does Carver Sub really put out 2,700 watts ? (0.00)
Posted by Trevor Wilson on 2001-08-13, 22:55:43 (61.9.192.141)
The theoretical efficiency of a Class B amplifier, is more like 75%, not 50%. In any case, the Carver sub cannot possibly deliver 2,700 Watts continuously. IT MAY be able to deliver 2,700 Watts, for b .......
175: General Asylum, Re: Nope.... (0.00)
Posted by Trevor Wilson on 2001-08-13, 16:08:29 (61.9.192.141)
Refer to my previous radial ply tyre analogy. Just as anyone buying an auto, which can only run on cross ply tyres, is limiting their buying choices, so is buying a Naim amplifier. An inductor could b .......
176: General Asylum, Re: Nope.... (0.00)
Posted by Trevor Wilson on 2001-08-13, 12:35:02 (61.9.192.141)
DNM. Trevor .......
177: General Asylum, Re: Nope.... (0.00)
Posted by Trevor Wilson on 2001-08-13, 12:33:23 (61.9.192.141)
Welly wrote: "I presume that you looked up my system, hence the "Even the Marantz PM17". btw, are you trying to infer that the Marantz is inferior also?" * Nope. Not at all. The PM17 is an excellent p .......
178: General Asylum, Re: WARNING! (0.00)
Posted by Trevor Wilson on 2001-08-12, 14:37:54 (61.9.192.141)
Standard zip cord will do fine. Trevor .......
179: General Asylum, Nope.... (0.00)
Posted by Trevor Wilson on 2001-08-12, 14:36:36 (61.9.192.141)
....,poorly designed. Pretty much any amplifier made, can cope with high capacitance speaker cables. Even a Marantz PM17. Naim is one of only two amplifier manufacturers, who cannot seem to build thei .......
180: General Asylum, WARNING! (0.00)
Posted by Trevor Wilson on 2001-08-12, 03:04:08 (61.9.192.141)
Do NOT use highly capacitive cable on any Naim amplifier! That includes coax. Use low capacitance, high inductance cable, only. Next time, buy a properly designed amp. Naim are fragile amplifiers. Tre .......
181: General Asylum, Re: Audiophile goodies/bargins in Tokyo? (0.00)
Posted by Trevor Wilson on 2001-08-03, 14:17:28 (61.9.192.141)
Iwas in Tokyo in 1987. There were no audio bargains. I even thought of exporting some of my old crap over there. Used prices were off the planet. What was great, though, was the range of interesting g .......
182: General Asylum, Armstrong is.... (0.00)
Posted by Trevor Wilson on 2001-07-29, 17:12:05 (61.9.192.142)
....the most amazing, most driven athlete this planet has ever seen. Gongrats to him. Trevor .......
183: General Asylum, Re: Solid State and fuse question? (0.00)
Posted by Trevor Wilson on 2001-07-26, 16:38:21 (61.9.192.142)
CJD wrote: "How efficient (in terms of total efficiency) are most solid state amps using transistors or MOSFETS. I've heard people say they can be 60-70% at rated power in termsof TOTAL. My book says .......
184: Tweakers' Asylum, Re: ss poweramp relay faulty,pls help (0.00)
Posted by Trevor Wilson on 2001-07-16, 07:10:35 (61.9.192.142)
The most important specs are: 1) The coil Voltage (and, to a lesser degree, the coil resistance) 2) The number and current rating of the contacts. Yours is a 24 VDC coil (unknown resistance) with 5 Am .......
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