1: Tube DIY Asylum, Maybe don't use a voltage doubler and do use LC (nt) (0.00)
Posted by Chip647 on 2024-10-08, 10:12:22 (172.11.32.65)
.......

2: Tubes Asylum, worth? $20. What will someone pay for it? Who knows. $40? (nt) (0.00)
Posted by Chip647 on 2024-10-04, 08:18:05 (172.11.32.65)
.......

3: Tube DIY Asylum, He also solved the worlds energy problems!! (0.00)
Posted by Chip647 on 2024-10-01, 09:12:48 (192.189.187.110)
I am sure the Luminati have suppressed this knowledge. .......

4: Tubes Asylum, And particularly in a phono preamp (0.00)
Posted by Chip647 on 2024-09-25, 07:49:07 (172.11.32.65)
A high current tube rectifier 5AR4 in a phono preamp is more about nostalgia than sonics. .......

5: Tweakers' Asylum, just get a schematic (or identify the parts visually) and order decent parts (0.00)
Posted by Chip647 on 2024-09-16, 13:08:29 (172.11.32.65)
the ebay stuff is almost exclusively chinese garbage .......

6: Tube DIY Asylum, RE: Cleaning up boost/buck heater drivers (0.00)
Posted by Chip647 on 2024-09-13, 07:41:25 (172.11.32.65)
Thanks. I will add more filtering. Given the nature of these units, absolute quiet was probably not on the design list. .......

7: Tube DIY Asylum, Yeah. Mv. Thanks. I will keep working it. (nt) (0.00)
Posted by Chip647 on 2024-09-13, 07:38:20 (172.11.32.65)
.......

8: Tube DIY Asylum, RE: Cleaning up boost/buck heater drivers (0.00)
Posted by Chip647 on 2024-09-12, 16:26:32 (172.11.32.65)
The 40mA AC on the outputs at 200kHz is probably nothing I should care about. I guess it is just the price of using high frequency switchers. Thanks. .......

9: Tube DIY Asylum, Cleaning up boost/buck heater drivers (0.00)
Posted by Chip647 on 2024-09-12, 12:05:44 (172.11.32.65)
Boost/Buck ICs with current limiting are pretty nifty to drive indirectly heated tubes. They really do extend the life of the heaters with the current limiting on switch on, at least emotionally. The .......

10: Tube DIY Asylum, I meant grid to ground resistor, and yes, a floating heater can hum (nt) (0.00)
Posted by Chip647 on 2024-09-10, 09:22:59 (199.81.206.148)
.......

11: Tube DIY Asylum, RE: SE amp noise of 200mV (0.00)
Posted by Chip647 on 2024-09-09, 07:47:02 (172.11.32.65)
what is the value of the grid resistor on the first 6SN7 stage? Where is that resistor grounded? (It should be grounded at the same spot the cathode bias resistor is grounded) .......

12: Tubes Asylum, RE: General Consensus - JJ 6L6GC ? (0.00)
Posted by Chip647 on 2024-08-23, 11:37:15 (172.11.32.65)
I have run them in guitar amps and they are reliable. I have used them SE and as interstage transformer drivers and they do the job of the 6L6GC. Can't beat them for the $92 a quad. I love running ba .......

13: Tube DIY Asylum, Often if you are using vintage or vintage style parts, they can be "hot" (0.00)
Posted by Chip647 on 2024-08-22, 07:11:46 (172.11.32.65)
A metal bracket to attach a metal cap can leave your top plate energized. Be careful when you ground the amp to the AC line ground and flo=ip the switch that the short does not blow up the capacitor a .......

14: General Asylum, Every component reviewed in TAS (nt) (0.00)
Posted by Chip647 on 2024-08-13, 15:16:18 (172.11.32.65)
.......

15: Tube DIY Asylum, Which board did you use? (nt) (0.00)
Posted by Chip647 on 2024-08-13, 09:11:26 (172.11.32.65)
.......

16: General Asylum, (+1) ;-0 (0.00)
Posted by Chip647 on 2024-08-11, 10:04:35 (172.11.32.65)
.......

17: Tubes Asylum, RE: ARC D 70 II - Yes (0.00)
Posted by Chip647 on 2024-08-08, 10:00:58 (172.11.32.65)
The "5th" tube is just a pass element for the regulator section. It just has to be a properly functioning tube of the 6550/KT88 family. It does not have to match the others. .......

18: Tweakers' Asylum, RE: Schumann frequency Redux (0.00)
Posted by Chip647 on 2024-08-02, 08:40:17 (172.11.32.65)
Just watch out for the worms .......

19: Tweakers' Asylum, RE: is there a soldering banana speaker jack trick? (0.00)
Posted by Chip647 on 2024-07-29, 15:07:37 (172.11.32.65)
Fully tin the speaker wire first. Get an iron with enough wattage to heat the jack quickly. add a small amount of solder when you do the final assembly. Compared to the actual contact the banana plug .......

20: SET Asylum, Same as a 300b (0.00)
Posted by Chip647 on 2024-07-13, 14:14:17 (172.11.32.65)
PSE 300b will get you a barely noticeable +3db volume over a single 300b. Far better to get those 3 dbs (or 10 dbs) with more efficient speakers. .......

21: Tube DIY Asylum, "with digital sources"??? Makes no sense (0.00)
Posted by Chip647 on 2024-07-13, 14:11:27 (172.11.32.65)
If you are in the digital domain just use digital equalization. .......

22: Tube DIY Asylum, Even simpler. What is the input impedance to your subwoofer amp? (0.00)
Posted by Chip647 on 2024-07-12, 17:02:55 (172.11.32.65)
If it is 100K, then you just need to take the signal off the positive and put a 100K resistor from the negative leg to ground. One resistor .......

23: Tube DIY Asylum, RE: How to devise a single-ended output from a balanced preamplfier (0.00)
Posted by Chip647 on 2024-07-12, 09:20:36 (172.11.32.65)
Just put the same load on the negative as the plus. 20K from the negative to ground and a 20k pot to positive will not disrupt your balanced output. Alternatively, the way I do it, is to use a 5K pot .......

24: SET Asylum, It should match the standard 300b or it is not a 300b (0.00)
Posted by Chip647 on 2024-07-09, 11:44:46 (172.11.32.65)
What parameter are you concerned about? .......

25: Tubes Asylum, Agree, your gain/driver section has 90% of the sonic impact tube wise. (0.00)
Posted by Chip647 on 2024-07-04, 07:59:27 (172.11.32.65)
Well functioning output tubes of the same type are very hard to distinguish between brands. The high dollar stuff of the past had more to do with durability than sonic nuance. The original WE 300b tub .......

26: Tube DIY Asylum, Heyboer is an option. (0.00)
Posted by Chip647 on 2024-06-30, 11:54:27 (172.11.32.65)
A lot of winders have stopped winding in the past few years. If you have the means and time, Dave is also a great choice: https://intactaudio.com .......

27: Tubes Asylum, Simpler problem (0.00)
Posted by Chip647 on 2024-06-27, 11:31:44 (172.11.32.65)
A 6SN7 is a fairly large tube compared to the stock tube and coupled with an adaptor on its base it is unlikely to fit in its chassis. On top of that, the tube is most likely just used as an output b .......

28: Headphone Heights, It seems to make you happy (0.00)
Posted by Chip647 on 2024-06-22, 08:14:07 (172.11.32.65)
Despite sounding bad. Just be aware that every single component in that will be counterfeit and/or typical chinese toy level electronic dreck. The cost of these things cannot be offset by slave labor .......

29: Tubes Asylum, if your circuit and power supply can support the 6SN7 its possible (0.00)
Posted by Chip647 on 2024-06-20, 13:07:03 (172.11.32.65)
But they are very different tubes with different operating points, different gain, different heater current. If this is to plug into a little headphone circuit board, plug away. If you have a more tra .......

30: Tubes Asylum, Why the power transformer failed? (0.00)
Posted by Chip647 on 2024-06-05, 08:12:28 (172.11.32.65)
Excessive heat causes the winding insulation to melt and short out. Why excessive heat? Could be a lot of factors. Higher wall voltage (125v vs 110-115 specked) The transformer may have been run close .......

31: General Asylum, That was a link to the 2023 cancellation (nt) (0.00)
Posted by Chip647 on 2024-06-03, 10:34:46 (172.11.32.65)
.......

32: Tube DIY Asylum, RE: NOVICE SRPP problem please help (0.00)
Posted by Chip647 on 2024-05-20, 11:05:49 (172.11.32.65)
Ra should match the cathode resistor's 180 ohms. The lower section plate voltage will be around half of the B+ voltage. Adjust the B+ voltage to hit it exactly. Your gain for this will be around 23 (2 .......

33: Tubes Asylum, It boils down to the circuit having by far the biggest impact on sound (0.00)
Posted by Chip647 on 2024-05-14, 08:51:06 (172.11.32.65)
of a component compared to tube flavor. People want/need +/- 3 to 6db and more impact on the frequency response when they are unhappy with the sound. If one brand of tube is "too bright", another bran .......

34: Tweakers' Asylum, Loose crystals will rattle around and turn into sand when shipping (0.00)
Posted by Chip647 on 2024-05-13, 07:33:50 (170.170.200.165)
They could not sell a finished electrical product with loose crystals without getting a big risk of lawsuit. From a physics standpoint, the epoxy would heat to dissipate the energy. .......

35: Tubes Asylum, Or just bypass the plate resistor with 250 to 500pf cap to tone down the treble (0.00)
Posted by Chip647 on 2024-05-13, 07:21:30 (192.189.187.112)
Most people really need tone controls as bright treble is the bane of a lot of speakers and also excites tinnitus .......

36: Tube DIY Asylum, The only thing what might be close is the Hammond 1642SE (0.00)
Posted by Chip647 on 2024-05-07, 12:27:30 (172.11.32.65)
I am using a pair for my 304TL amp. 28 pounds, very large. However, I am using them from 100hz and above because I never can get enough big bad solid state bass. .......

37: Tube DIY Asylum, You are using the resistor to buffer the CCS, so the plate (nt) (0.00)
Posted by Chip647 on 2024-04-29, 08:37:12 (172.11.32.65)
.......

38: SET Asylum, RE: And these would be for a 45/2A3 in a high mid/Tweeter amp? (0.00)
Posted by Chip647 on 2024-04-29, 08:31:38 (172.11.32.65)
0.04 * 600 = 24 watts (75 watt max for he 75tl) With the 75tl you could consider doubling the plate voltage to 1200 volts. As it is, running a 75tl at 1/3 dissipation is way down in the curves. The tu .......

39: Headphone Heights, copper is non magnetic (NT) (0.00)
Posted by Chip647 on 2024-04-26, 14:24:42 (172.11.32.65)
c .......

40: SET Asylum, RE: And these would be for a 45/2A3 in a high mid/Tweeter amp? (0.00)
Posted by Chip647 on 2024-04-26, 06:11:57 (172.11.32.65)
What operating point would you be running the 75tl? .......

41: SET Asylum, 40mA above 800hz? (0.00)
Posted by Chip647 on 2024-04-25, 05:25:22 (172.11.32.65)
40mA and F => 800hz What is the highest working voltage? .......

42: Tweakers' Asylum, "Amazon" is some meth dealer in a white van. There is no "Amazon" (0.00)
Posted by Chip647 on 2024-04-22, 10:18:16 (172.11.32.65)
Just buy parts from those who make them. .......

43: SET Asylum, And these would be for a 45/2A3 in a high mid/Tweeter amp? (0.00)
Posted by Chip647 on 2024-04-22, 07:31:42 (172.11.32.65)
Just curious .......

44: Tube DIY Asylum, Why not just use the standard 10M45S CCS on a chip? (0.00)
Posted by Chip647 on 2024-04-18, 06:17:24 (172.11.32.65)
Whole lot simpler .......

45: Tube DIY Asylum, 220,000 (nt) (0.00)
Posted by Chip647 on 2024-04-18, 06:11:32 (172.11.32.65)
.......

46: Tube DIY Asylum, You were right (0.00)
Posted by Chip647 on 2024-04-16, 17:21:15 (172.11.32.65)
I have a lot of old tubes that bought a long time ago. The one I grabbed as a 6SL7 was really a 6SN7 that had been put into the wrong box. The identifiers had been long wiped away, but looking at it, .......

47: Tube DIY Asylum, Help with 6SL7 tube curves (0.00)
Posted by Chip647 on 2024-04-16, 13:21:57 (172.11.32.65)
Very simple circuit below in one of my amps B+ 370 Plate Resistor 220k Plate Voltage 90 Cathode resistor 2.3K Cathode Voltage 3.2v Current 1.4mA (0.126 plate watts) (Thats 100K after the 0.22uF coupli .......

48: Tube DIY Asylum, Thanks - That is the concusion I was coming to as well (0.00)
Posted by Chip647 on 2024-04-12, 13:40:16 (172.11.32.65)
Hard not to get paranoid sometimes :-) .......

49: Tube DIY Asylum, Need for Soft-Start / Standby for Solid State Rectification? (0.00)
Posted by Chip647 on 2024-04-12, 11:56:45 (172.11.32.65)
I have been using SS rectification a lot more recently. I have usually used a soft-bias switch for starting up so I don't "stress" the tubes. Using normal audio IDH receiver tubes, is soft start reall .......

50: Tube DIY Asylum, choke or CCS? Resistors work just fine. (0.00)
Posted by Chip647 on 2024-04-11, 06:15:50 (172.11.32.65)
Spec them right and they will never fail, not pick up any stray magnetic noise, not distort on overdriven peaks and are super simple to implement. Tubes were designed to be loaded by resistors. If you .......

51: Tube DIY Asylum, You should have at least -90 available to filter and adjust down to -60 or so (nt) (0.00)
Posted by Chip647 on 2024-04-10, 07:44:52 (172.11.32.65)
.......

52: Tube DIY Asylum, Sharpie (0.00)
Posted by Chip647 on 2024-04-09, 09:22:44 (199.81.206.172)
DIY should be a little weird. .......

53: General Asylum, RE: Any U S inmates exploding gunpowder to chase Dragon from Sun. (0.00)
Posted by Chip647 on 2024-04-08, 19:43:36 (172.11.32.65)
98%. It was dim. 98%. It was dim. .......

54: Tweakers' Asylum, RE: how about Raspberry Pi's... (0.00)
Posted by Chip647 on 2024-04-08, 13:10:33 (172.11.32.65)
looking at the raspberry pi schematic, it looks like it is using DC-DC converters rather than ultra LDO voltage regulators for the 3v. Gilding a lily only kills it. .......

55: Tweakers' Asylum, Yes, yes it does. (0.00)
Posted by Chip647 on 2024-04-07, 10:52:17 (172.11.32.65)
"The UC28023 and UC28025 are fixed-frequency PWM controllers optimized for high-frequency switched-mode power-supply applications. The UC28023 is a single output PWM for single-ended topologies while .......

56: Tube DIY Asylum, Like anything, there are tradeoffs (0.00)
Posted by Chip647 on 2024-03-31, 09:53:51 (172.11.32.65)
For a 1.2 amp 5V supply, I agree it is not the absolute best solution to use a SMPS as they are not too difficult to build if you have the right transformers. But simply using a decent SMPS in a remot .......

57: General Asylum, You can even use You Tube for free if you don't mind some adds (nt) (0.00)
Posted by Chip647 on 2024-03-30, 18:24:56 (172.11.32.65)
.......

58: Tube DIY Asylum, Most of the crud is well above 20kHz (nt) (0.00)
Posted by Chip647 on 2024-03-30, 13:09:37 (172.11.32.65)
.......

59: Tube DIY Asylum, I put the SMPS in a external shielded box. No noise at all. (nt) (0.00)
Posted by Chip647 on 2024-03-29, 12:03:45 (172.11.32.65)
.......

60: General Asylum, I've made some questionable choices. (nt) (0.00)
Posted by Chip647 on 2024-03-28, 06:45:04 (172.11.32.65)
.......

61: Tube DIY Asylum, RE: Anyone use 5V switching power supply for 300b filament? (0.00)
Posted by Chip647 on 2024-03-28, 06:31:21 (172.11.32.65)
I am using a pair per channel of 5v SMPS for lighting the 304TL DHT. They do the trick and are quiet. Way cheaper than trying to build a 25 amp 5 volt linear power supply (and probably much quieter) F .......

62: Tweakers' Asylum, 12v times 0.6 amps equals 7.2 Watts (0.00)
Posted by Chip647 on 2024-03-27, 11:18:35 (172.11.32.65)
That is what your wall wart outputs. 12 volts at 0.6 amps. Any power supply that does 12 volts and has 0.6 amps of current or greater will work. .......

63: General Asylum, They did not pay for the digital rights (0.00)
Posted by Chip647 on 2024-03-15, 16:19:21 (172.11.32.65)
Which are sold separately. This is what you would expect from a vinyl reissuer. Tons of ways to get the digital downloads though. .......

64: General Asylum, You mean a portable bluetooth speaker? (nt) (0.00)
Posted by Chip647 on 2024-03-07, 10:12:07 (192.189.187.101)
.......

65: General Asylum, The concerns have nothing to do with tax policy (more about militaristic despotism with global domination) (0.00)
Posted by Chip647 on 2024-02-22, 10:44:52 (172.11.32.65)
You need to study history a little bit. china is not a friend of the west. .......

66: General Asylum, Xi Jinping, is that you? (nt) (0.00)
Posted by Chip647 on 2024-02-22, 10:34:48 (172.11.32.65)
.......

67: General Asylum, Is this something you are hoping for? (0.00)
Posted by Chip647 on 2024-02-22, 07:34:57 (172.11.32.65)
Looking to save money on the path to destruction? .......

68: Tube DIY Asylum, Just becase you can does not always mean you should (0.00)
Posted by Chip647 on 2024-02-20, 12:04:53 (172.11.32.65)
Just use matched 1K to 10K resistors from each input to a common tube grid.. Then use the tube to buffer/amplify the mono signal. You could use a twin triode and join the cathodes, then put one chan .......

69: Amp/Preamp Asylum, Agree!!! - Your system has way way too much gain (0.00)
Posted by Chip647 on 2024-02-15, 07:54:19 (172.11.32.65)
Component matching is a thing. You need a buffered attenuator rather than a high gain preamp. .......

70: General Asylum, Type "Best Tokyo HiFi Shops For Used Equipment" in the google (0.00)
Posted by Chip647 on 2024-02-10, 20:58:21 (172.11.32.65)
There are responses. .......

71: Tubes Asylum, When you put the original tubes back in, is it quiet? (0.00)
Posted by Chip647 on 2024-02-06, 08:51:03 (172.11.32.65)
Try replacing the tubes one by one to find the position that is causing problems. The 5814 draws a tiny bit more heater current but are otherwise identical electrically.. 5 tubes (10 line-stage tube s .......

72: Tweakers' Asylum, RE: How many are directly in the signal path? (nt) (0.00)
Posted by Chip647 on 2024-01-27, 12:06:46 (172.11.32.65)
It looks pretty dense in there with all your mods. There are film caps that you could use, but they are probably a bit too large to fit into the available real estate. .......

73: Tube DIY Asylum, The mark III uses tubes with heaters rather than filiment cathodes (0.00)
Posted by Chip647 on 2024-01-24, 16:29:25 (172.11.32.65)
These heaters carry no signal so the capacitor will just function as a capacitor. No need to get all fancy. I don't know how effective the single small cap is off the center tap on raising the voltage .......

74: Tweakers' Asylum, How many are directly in the signal path? (nt) (0.00)
Posted by Chip647 on 2024-01-24, 06:53:23 (172.11.32.65)
.......

75: Tube DIY Asylum, RE: You could also leave them alone and turn them on (0.00)
Posted by Chip647 on 2024-01-23, 18:23:15 (172.11.32.65)
Honestly, I have had a lot of (quality) equipment that has set for 20 years and have never had any type of cap failure. Wouldn't do it with chinese made crap though. .......

76: Tweakers' Asylum, What values are you looking for? UF and Voltage (nt) (0.00)
Posted by Chip647 on 2024-01-23, 17:15:25 (172.11.32.65)
.......

77: Tweakers' Asylum, Black Gates were ok. Not to the level they were hyped. (0.00)
Posted by Chip647 on 2024-01-23, 08:08:08 (172.11.32.65)
DC Link non-electrolytic caps are better and will not fail sitting on the shelf. .......

78: Tube DIY Asylum, You could also leave them alone and turn them on (0.00)
Posted by Chip647 on 2024-01-23, 07:53:25 (172.11.32.65)
Highly doubtful that the modern electrolytics would have degraded over that time. .......

79: Tweakers' Asylum, The issue with resonance is related to 50Hz and 60Hz "signals" (0.00)
Posted by Chip647 on 2024-01-14, 13:49:26 (172.11.32.65)
Unless you are playing 60hz "music" you need to go beyond power line theory. .......

80: Tubes Asylum, You are right - and used in a guitar amp (0.00)
Posted by Chip647 on 2024-01-12, 11:54:17 (172.11.32.65)
You can see the claw marks clearly on one of the tubes as only guitar amps use. I just overlooked it as a terrible picture .......

81: Tubes Asylum, those look like the same construction as tube made in the Svetlana plant (0.00)
Posted by Chip647 on 2024-01-11, 08:43:41 (172.11.32.65)
Would likely be newer production New Sensor / Electro Harmonix. They look authentic. They could be recent production and Mike painted them different. On the website the tubes pictured are over 20 year .......

82: Tubes Asylum, Yellow Jacket's have internal resistors (0.00)
Posted by Chip647 on 2024-01-10, 06:58:24 (172.11.32.65)
"They not only rearrange the pin locations of the tubes, but also provide the necessary plate voltage drop and current limiting on the screens as well as blocking the amplifier's grid bias voltage whi .......

83: Tube DIY Asylum, If the distortion is sporadic (nt) (0.00)
Posted by Chip647 on 2024-01-08, 08:22:00 (172.11.32.65)
.......

84: Tube DIY Asylum, RE: good point! (0.00)
Posted by Chip647 on 2024-01-08, 08:20:20 (172.11.32.65)
I built that exact amp 15 years ago. Very nice 10 watt circuit. If you have residual hum or noise you could add a choke for the power supply for the 6SL7 section and raise the heater to a 40v bias. Yo .......

85: Tubes Asylum, Heresy and Subs (0.00)
Posted by Chip647 on 2024-01-05, 09:16:16 (172.11.32.65)
They can work well, if you have a very flexible crossover, more than one sub and measure with something like Fuzzmeasure. Not a cost savings move. It is really hard to get punchy bass with low power t .......

86: Tube DIY Asylum, RE: Eastern Electric M88 schematic? (0.00)
Posted by Chip647 on 2024-01-05, 09:03:56 (172.11.32.65)
Yeah, those can be hard to track down. One easy point of failure is the solder connection of the tube socket to the circuit board. Those would just need to be touched with a solder iron and a little .......

87: Tweakers' Asylum, The switch does not care about how many positions are used (0.00)
Posted by Chip647 on 2024-01-04, 09:18:09 (172.11.32.65)
There is a little pin you put into the mechanism to let you select the number of positions you would like to use. .......

88: Tweakers' Asylum, This is the switch you want (0.00)
Posted by Chip647 on 2024-01-03, 09:27:48 (172.11.32.65)
Grayhill .......

89: Tube DIY Asylum, RE: Eastern Electric M88 schematic? (0.00)
Posted by Chip647 on 2024-01-02, 13:05:58 (172.11.32.65)
it is not going to be so much about a schematic but rather tearing it apart to get access to the circuit boards. Any decent tube tech can trace the basic circuit blocks. What is wrong with it? ::: TOP .......

90: Tube DIY Asylum, Ahhhh, you want the magic of tube hype (0.00)
Posted by Chip647 on 2023-12-16, 15:59:43 (172.11.32.65)
"tremendous strong bass" is going to be limited by the output transformer of the 300b and the speaker, not the driver tube. If you want strong, tight bass with average speakers, solid state is the wa .......

91: Tube DIY Asylum, "bass and has full body" (0.00)
Posted by Chip647 on 2023-12-14, 14:51:08 (172.11.32.65)
Tubes, relevant to audio service, are generally linear devices. There are those with a hatred of 12AU7 tubes in gain positions, but forget those for a minute. When you have weak bass or a midrange suc .......

92: Inmate Central, When you do EXACTLY what your enemy baits you in to doing (0.00)
Posted by Chip647 on 2023-12-14, 07:30:46 (172.11.32.65)
...it is not a winning strategy. Hamas launched the attack with 2 objectives: 1. They knew Israel would respond aggressively against Gaza and they could use this to cast themselves as the victims to h .......

93: SET Asylum, Good used will get you the furthest (0.00)
Posted by Chip647 on 2023-12-03, 15:48:30 (172.11.32.65)
Buying used, you can sell it for what you paid for it and modding it will not be as big of a financial issue. In general, toroidal output transformers do not overload as gracefully as conventional tra .......

94: Tube DIY Asylum, You could also try something like this (0.00)
Posted by Chip647 on 2023-11-30, 12:14:53 (172.11.32.65)
Technically a capacitance multiplier. Still using the VR tubes, the MOSFET works as a source follower and can be any of a number of high voltage MOSFET (IFR720, IFR820, IFRBC20PBF). The 1 meg resistor .......

95: Tube DIY Asylum, RE: I see some minimal reactance psu elements? (0.00)
Posted by Chip647 on 2023-11-29, 14:13:03 (172.11.32.65)
Reactance is related to the inductance in the chokes, which at 8H is pretty high. The Resistance is fairly low at 75 ohms. Do you mean lower DCR (DC resistance) power supply? Or am I missing something .......

96: Tweakers' Asylum, So that is what they found in the Whitehouse recently! (0.00)
Posted by Chip647 on 2023-11-16, 10:13:27 (172.11.32.65)
Did not know Biden was an audiophile! .......

97: Tube DIY Asylum, My vote is for a Plate load (0.00)
Posted by Chip647 on 2023-10-27, 16:16:20 (172.11.32.65)
I use cathode CCS is best to force PP output tubes into class A. I had the same situation recently where I implemented a pair of 20 year old Budda Camille C4S CCS boards (with original UP LEDs and tra .......

98: General Asylum, Did you see the Decware 2 year waitlist with over 2,000 orders pending? (0.00)
Posted by Chip647 on 2023-10-27, 07:59:22 (172.11.32.65)
Incredible that they would have a 2 year waitlist. They need help!!! .......

99: Tube DIY Asylum, "if they are worth using" (0.00)
Posted by Chip647 on 2023-10-24, 12:35:14 (172.11.32.65)
They are just line audio transformers; 600 ohm transmission standard for professional equipment. Typically, these types of transformers are there to solve impedance issues on long cable runs, they are .......

100: Amp/Preamp Asylum, Try the Tube/DIY forum. Probably someone there could fix it. (0.00)
Posted by Chip647 on 2023-10-23, 11:27:07 (172.11.32.65)
What is the part number on the TO-3 regulator for the heaters? (the big silver thing with the heatsink). That part is potentially the hardest to source as the number of ICs in the TO-3 package is dwin .......

101: Tubes Asylum, RE: How does a lower current for the heater at the same voltage affect GM? (0.00)
Posted by Chip647 on 2023-10-22, 18:31:54 (172.11.32.65)
Lower heater current boils fewer electrons off the cathode if your cathode has the same formulation/size/heater structure. There is the life test on some heaters which simply cuts the heater voltage a .......

102: Tube DIY Asylum, Canadian made Aim 62/36/2 is great (Mouser) (nt) (0.00)
Posted by Chip647 on 2023-10-16, 08:48:11 (172.11.32.65)
.......

103: Tube DIY Asylum, "any particular reason for audionote to use one more PI stage" (0.00)
Posted by Chip647 on 2023-10-13, 13:41:26 (172.11.32.65)
They did not find the ripple coming off the choke made the amp quiet enough. Nothing wrong with a second power supply filter. I would question running the choke at max rating. I would REALLY question .......

104: Tweakers' Asylum, The beat. I think Blue Monday was based on it :-) (0.00)
Posted by Chip647 on 2023-10-10, 07:24:02 (172.11.32.65)
.......

105: Tube DIY Asylum, "reduce the harsh distortion reasonably" (0.00)
Posted by Chip647 on 2023-10-04, 11:45:41 (172.11.32.65)
If you have harsh distortion, you have a basic circuit design issue. Band aids won't really do much. Just for fun, find out the answer to these 3 questions: 1. What is the grid to cathode bias voltage .......

106: Tubes Asylum, It is the feedback windings that will get you. (0.00)
Posted by Chip647 on 2023-10-01, 14:43:02 (172.11.32.65)
McIntosh did a similar thing. No real good third party solutions to this exist I am aware of. Approaching another winder for a "rewind" of the historic lams will get you few if any responses and no ta .......

107: Tweakers' Asylum, idle evidence of a booming industry years ago... (0.00)
Posted by Chip647 on 2023-09-29, 11:30:10 (172.11.32.65)
I think they got all the sea creatures! .......

108: Amp/Preamp Asylum, I would suspect the heater regulator (0.00)
Posted by Chip647 on 2023-09-29, 07:41:41 (172.11.32.65)
It is that TO-3 part in the picture above. When you turn the unit on are the heaters glowing fully? .......

109: Tweakers' Asylum, I have an AA-32 kit in its sealed shipping box (0.00)
Posted by Chip647 on 2023-09-29, 07:35:57 (172.11.32.65)
It is a time capsule that I don't have the heart to open! .......

110: Tube DIY Asylum, The one great thing about switch mode power supplies (0.00)
Posted by Chip647 on 2023-09-29, 06:48:53 (172.11.32.65)
No 60hz/120hz noise. I have implemented some of the circuits that Pete Millet designed but I cannot say I understand everything in those cascaded power ICs .......

111: Tube DIY Asylum, Alibaba? (and the 40 thieves) (0.00)
Posted by Chip647 on 2023-09-28, 12:27:29 (172.11.32.65)
What is it? A cathode follower? Gain/Cathode? Mu Stage? Easy to produce low noise when there is no gain. .......

112: General Asylum, RE: LED mystery (0.00)
Posted by Chip647 on 2023-09-27, 06:53:15 (172.11.32.65)
Some LEDs are very directional. Look at it from the same angle and light conditions you did when you thought it was burned out. .......

113: General Asylum, Relating to guitar overdrive sounds when driven into clipping (0.00)
Posted by Chip647 on 2023-09-26, 14:00:51 (172.11.32.65)
Not when driven in a HiFi setup. They are very clean. .......

114: Tube DIY Asylum, Usually it will not cause a signal spike (0.00)
Posted by Chip647 on 2023-09-24, 12:13:59 (172.11.32.65)
You should protect the contact with a safety rated 0.1uf to 0.01uf capacitor across the contacts to snub the arcing. You can also put a 10K to 20K resistor across the contacts to have a small amount o .......

115: Tube DIY Asylum, Does it create risk ? Yes, yes it does. (0.00)
Posted by Chip647 on 2023-09-22, 09:35:57 (172.11.32.65)
Dennis Had was not known for his conservative approach. It can work for a while with 220K but when eventually the tube oscillates or the operating point shifts or solar flares and the tube starts to .......

116: Tube DIY Asylum, Agree (0.00)
Posted by Chip647 on 2023-09-21, 16:11:18 (172.11.32.65)
Mouser gave me a Net30 account for my consistent small purchases. This type of trust is Extremely rare these days. .......

117: General Asylum, What Color? Red? Could be a Toslink as well (nt) (0.00)
Posted by Chip647 on 2023-09-21, 08:24:56 (172.11.32.65)
.......

118: Tube DIY Asylum, They love you (Or they would have minimum quantities) (0.00)
Posted by Chip647 on 2023-09-21, 08:11:22 (172.11.32.65)
I thought the same thing when i ordered just the 40 different low quantity parts needed to populate a circuit board. I am a total PITA I am sure!!! .......

119: Tube DIY Asylum, Mighty nice watt! (nt) (0.00)
Posted by Chip647 on 2023-09-20, 16:13:20 (172.11.32.65)
.......

120: Tube DIY Asylum, RE: mono or stereo? Full Wave or Bridge? (0.00)
Posted by Chip647 on 2023-09-16, 08:26:58 (172.11.32.65)
You can get away with 2 (they have the needed current capacity) in full wave or 4 in Bridge configuration. That Lamm used 6 indicates: 1. Mono full wave, 2 for each GM70 and 2 for driver stage vol .......

121: Tube DIY Asylum, mono or stereo? Full Wave or Bridge? (0.00)
Posted by Chip647 on 2023-09-15, 09:21:15 (172.11.32.65)
They have a max current of 165mA each versus the 137mA of the 6AX4-GT. This image shows that PSUII finds no problems supplying 180mA from a pair at that voltage .......

122: Tweakers' Asylum, A VARIAC is important (0.00)
Posted by Chip647 on 2023-09-15, 07:28:15 (172.11.32.65)
Slowly ramp up and measure current .......

123: Tube DIY Asylum, RE: The Coleman regulators are nice but don't like hash (0.00)
Posted by Chip647 on 2023-09-14, 05:13:47 (172.11.32.65)
Thanks, I will definitely give those a try. It is a shame about the Hammond manufacturing shift to china. They really are not the same quality. .......

124: Tube DIY Asylum, RE: The Coleman regulators are nice but don't like hash (0.00)
Posted by Chip647 on 2023-09-14, 05:10:17 (172.11.32.65)
I will try additional screening. I never had as much EMI interference but it probably is a combination of the 801a and output transformers being sensitive to the noise pickup. Thanks .......

125: Tube DIY Asylum, The Coleman regulators are nice but don't like hash (0.00)
Posted by Chip647 on 2023-09-13, 09:31:43 (172.11.32.65)
Each channel Schottky & torrid with 2 of the 60mH Hammond chokes, balanced off the positive and negative outputs of the configured bridge rectifier then into a CRC filter. The supply itself is super q .......

126: Tube DIY Asylum, RE: Any tricks for shielding diodes on filament supplies? (0.00)
Posted by Chip647 on 2023-09-12, 07:08:59 (172.11.32.65)
Yeah, I was thinking of that, particularly to drive a Rod Colman reg. I used a quad of the SMPS to light a pair of the 25 amp 304tl Eimac and they are noise free. The choke loaded power supply sounds .......

127: Tube DIY Asylum, Any tricks for shielding diodes on filament supplies? (0.00)
Posted by Chip647 on 2023-09-11, 10:49:54 (172.11.32.65)
I have had to resort to a longish umbilical with a separate dedicated filament supply to get a 10/801a preamp quiet. Nasty hash on a cap loaded supply, "nice" 120hz hum on a choke loaded supply. What .......

128: Tubes Asylum, that is not a tube. it is a class d amp in a jar. (nt) (0.00)
Posted by Chip647 on 2023-09-05, 13:16:36 (172.11.32.65)
.......

129: Tube DIY Asylum, EL34 @ 50mA will have that 10 ohm resistor seeing only 2.5% of a watt (0.025 watts) (0.00)
Posted by Chip647 on 2023-08-30, 20:01:28 (172.11.32.65)
It is not failing due to watt rating. Even a 1/4 watt rated resistor would be 10x over the requirement. Something other than current is causing it to fail. A half watt resistor is all you should use a .......

130: General Asylum, "After I inserted my new Leben RS30-EQ..." (0.00)
Posted by Chip647 on 2023-08-22, 11:16:33 (172.11.32.65)
That is likely the issue. Try lifting the phono ground wire. .......

131: Tube DIY Asylum, Any quality electrolytic that can handle the ripple voltage with a reasonable ESR is fine (0.00)
Posted by Chip647 on 2023-08-19, 15:12:17 (172.11.32.65)
Decent power supply caps are not hyper-specific. Good Panasonic, Nichicon, CDE or the like are fine. You want to get fru fru, use big film caps. .......

132: Tube DIY Asylum, RE: You are going to have to learn SPICE (0.00)
Posted by Chip647 on 2023-08-19, 15:07:12 (172.11.32.65)
Yes, no drive .......

133: Tube DIY Asylum, You are going to have to learn SPICE (0.00)
Posted by Chip647 on 2023-08-17, 11:29:44 (172.11.32.65)
I would have to model it. Also, your "direct" output is a big mistake. You need the source follower. .......

134: Tube DIY Asylum, They are very small and have a nice feel (0.00)
Posted by Chip647 on 2023-08-01, 14:22:32 (172.11.32.65)
I have used this pot in a stereo volume configuration and they work well. My problem with balance controls is that there is always a reason that something is not balanced that can be corrected in the .......

135: General Asylum, There needs to be a mortuary in the Asylum (nt) (0.00)
Posted by Chip647 on 2023-07-27, 07:50:22 (172.11.32.65)
.......

136: Tube DIY Asylum, Ok... (0.00)
Posted by Chip647 on 2023-07-27, 07:01:06 (172.11.32.65)
The tech aspect usually revolves around the internal resistance of the part. The 20 to 100 ohms resistance in different LEDs might be audible as the lower resistance will create lower local feedback m .......

137: Tube DIY Asylum, Yep, they are both diodes with forward voltage drop (0.00)
Posted by Chip647 on 2023-07-27, 06:11:01 (172.11.32.65)
Measure the current thought the tube plate load to calculate the operating point. The 1N4148 will have a forward voltage drop around 0.7v. If you wanted 1.5 volt bias you would need 2 in series. Peopl .......

138: Tube DIY Asylum, RE: Self bais without cathode R? (0.00)
Posted by Chip647 on 2023-07-25, 05:50:08 (172.11.32.65)
It is called grid leak bias. There is some current flowing through the grid through that 4m resistor which raises the grid above the cathode. For example, if the operating condition is for a 2v bias, .......

139: Tube DIY Asylum, Agree on system (0.00)
Posted by Chip647 on 2023-07-20, 07:14:01 (172.11.32.65)
One thing that was really super apparent was the response of a 12" PA speaker with a horn (upgraded with a very nice compression driver). The crossover is a bit of a mess and the venting of the driver .......

140: SET Asylum, I think you mean A2 rather than class B (0.00)
Posted by Chip647 on 2023-07-17, 14:05:45 (172.11.32.65)
You need not only an interstage, but an interstage that can supply some current to drive the positive grid. .......

141: Tube DIY Asylum, I don't think you are getting as much benefit you think you are out of the light bulb trick (0.00)
Posted by Chip647 on 2023-07-11, 07:26:22 (172.11.32.65)
One condition you look for in the light bulb is brightness when using an over rated lightbulb (not really limiting current or protecting the amp much over a fuse) but showing a fault. The other condi .......

142: Tube DIY Asylum, Like a $20 current meter? Light bulbs were for people who could not afford test equip (nt) (0.00)
Posted by Chip647 on 2023-07-10, 10:56:30 (172.11.32.65)
.......

143: General Asylum, There are still brick and mortar HiFi shops outside of NYC/Chicago/LA? (0.00)
Posted by Chip647 on 2023-07-05, 12:11:19 (172.11.32.65)
I have not been able to find one in years .......

144: Tube DIY Asylum, F-Series absolutely (0.00)
Posted by Chip647 on 2023-07-03, 12:10:10 (172.11.32.65)
F Series .......

145: General Asylum, B&W 800 Series Diamond (0.00)
Posted by Chip647 on 2023-07-03, 09:29:15 (172.11.32.65)
.......

146: General Asylum, To make money or to make a fantasy playground? (0.00)
Posted by Chip647 on 2023-07-03, 09:15:41 (172.11.32.65)
To make money it would be a chinese outlet store like Amazon. As a fantasy store selling quality equipment to mythical, sane, music loving, well employed/rich people I would just have 3 rooms with 3 s .......

147: Tube DIY Asylum, Wouldn't that be tantamount to running a signal through a rectifier? (0.00)
Posted by Chip647 on 2023-07-03, 08:34:49 (172.11.32.65)
Maybe for a guitar distortion pedal .......

148: General Asylum, I bet you would have rather sold them now (nt) (0.00)
Posted by Chip647 on 2023-06-26, 16:57:09 (172.11.32.65)
.......

149: SET Asylum, CV378 / GZ37 were a common sub for 5AR4 as they were very good tubes (nt) (0.00)
Posted by Chip647 on 2023-06-16, 13:56:44 (172.11.32.65)
.......

150: Tube DIY Asylum, What's scary is that the Wayback Machine may be going away (0.00)
Posted by Chip647 on 2023-06-14, 09:00:04 (172.11.32.65)
Apparently the internet is too big now. Right now you can go back in time to get a down site. .......

151: General Asylum, RE: Which measurements? The Room (0.00)
Posted by Chip647 on 2023-06-13, 07:55:58 (172.11.32.65)
The room is the key component. You can put a $1,000,000 stereo in a closet and it will image like crap. .......

152: Tube DIY Asylum, The market agrees with you. It is (for all intents and purposes) dead (nt) (0.00)
Posted by Chip647 on 2023-06-13, 07:52:06 (172.11.32.65)
.......

153: Tube DIY Asylum, I find that there is a mental component that is inseparable from the sonic component (0.00)
Posted by Chip647 on 2023-06-09, 12:41:11 (172.11.32.65)
So many times I have spent a lot on expensive components because I felt I should rather that being able to really hear, past the placebo effect. Bypass your Solens with 1uf film/foil or paper/foil to .......

154: General Asylum, The solidity and industrial quality of the 1970's production was awesome (0.00)
Posted by Chip647 on 2023-06-09, 12:29:21 (172.11.32.65)
I have an old SP5 that has been reworked into a preamp/crossover. But every time I touch it, it still feels like an ARC unit. The old equipment was just cool. The later stuff I could care less about. .......

155: General Asylum, To quote Medical Officer Bones: "It's Dead, Jim" (0.00)
Posted by Chip647 on 2023-06-08, 09:27:32 (172.11.32.65)
Vultures picking the bones. For $1m to purchase $3m of inventory, then sell the name off to china. Easy, effort free way of making several million. .......

156: General Asylum, did you get your package? (nt) (0.00)
Posted by Chip647 on 2023-06-08, 09:17:42 (172.11.32.65)
.......

157: Tweakers' Asylum, Product IDEA - Copy the CD file onto a SSD!!! (0.00)
Posted by Chip647 on 2023-06-03, 17:15:41 (172.11.32.65)
No moving parts and perfect reading for playback! Wow, that would be something!!!! .......

158: General Asylum, It is the weekend, the 5th is Monday (0.00)
Posted by Chip647 on 2023-06-03, 17:13:32 (172.11.32.65)
You might want to not freak out. If you want to pay several hundred dollars you can get first overnight on Sunday but that is pretty silly. What created a society that can't wait 5 days for a (complet .......

159: Tubes Asylum, Telefunken or chinese El156? (0.00)
Posted by Chip647 on 2023-06-02, 07:10:00 (172.11.32.65)
chinese 8 pin plug right in (make sure pin 1 is hooked to pin 8 in the Dynaco). Telefunken have 10 pins and need an adaptor or a socket replacement with rewire. .......

160: General Asylum, I think that is called a "prostitute" (0.00)
Posted by Chip647 on 2023-06-01, 07:55:22 (172.11.32.65)
Agreed that it is much cheaper than a "wife" .......

161: Tube DIY Asylum, RE: How many EL156 should I use? (0.00)
Posted by Chip647 on 2023-06-01, 07:43:04 (172.11.32.65)
5 x 600 = 3,000 6 x 600 = 3,500 5 or 6 pair .......

162: General Asylum, That was the point (0.00)
Posted by Chip647 on 2023-05-29, 18:21:00 (172.11.32.65)
Perfect measuring nylon strings get you nothing on a Strat .......

163: General Asylum, "... want to smash a Stradivarius." This would probably do it. (0.00)
Posted by Chip647 on 2023-05-26, 14:32:16 (172.11.32.65)
Out of anger .......

164: General Asylum, Absolutely! You have to first and foremost measure the system. (0.00)
Posted by Chip647 on 2023-05-26, 14:26:47 (172.11.32.65)
Or else it is like measuring guitar strings. Important, but ultimately worthless to have the best measuring nylon strings on your Strat. And the Strat is worthless without an amp. And the amp is worth .......

165: Tubes Asylum, That appears to be the case (nt) (0.00)
Posted by Chip647 on 2023-05-18, 06:21:36 (172.11.32.65)
.......

166: General Asylum, Most likely a "Red" knight (0.00)
Posted by Chip647 on 2023-05-11, 10:44:08 (172.11.32.65)
I would hold off on the celebrations until more info. .......

167: SET Asylum, RE: Diagnosing a major issue with my 300b SET (0.00)
Posted by Chip647 on 2023-05-03, 12:08:46 (172.11.32.65)
Have you ever plugged a preamp into an amp with an RCA interconnect and the positive pin for the first interconnect contacted before the ground shell? You get a strong hum through the amp and speakers .......

168: Tweakers' Asylum, Sharp spikes bolted though the stand top (a la Target) (nt) (0.00)
Posted by Chip647 on 2023-05-03, 09:21:05 (172.11.32.65)
.......

169: SET Asylum, You might be conflating "volume" with output power and sensitivity (0.00)
Posted by Chip647 on 2023-05-03, 09:01:11 (172.11.32.65)
Amps will have different sensitivity levels. Meaning one amp may go to full output with 0.1 v input while another may need 2.0 v to reach the same power output level. If by volume you are meaning the .......

170: General Asylum, Or how much it is biased in class-B, which is worse (0.00)
Posted by Chip647 on 2023-04-28, 18:30:54 (172.11.32.65)
It will play a long time if 100% Class-B biased with quiet music. Class A, I don't care how big your caps are, it wont play long. .......

171: General Asylum, Unregistered Securities are not "Illegal" (0.00)
Posted by Chip647 on 2023-04-21, 13:46:49 (172.11.32.65)
Though to purchase you do have to be a qualified investor; someone who meets the required net worth and/or income requirements. These requirements, however, likely disqualify the majority of the sing .......

172: General Asylum, you link to an 18 minute talking head? (0.00)
Posted by Chip647 on 2023-04-10, 08:29:00 (172.11.32.65)
life is too short, what are you trying to tell us .......

173: Tube DIY Asylum, RE: DIY Tube Amps Builders Are Dying (0.00)
Posted by Chip647 on 2023-03-31, 07:43:09 (172.11.32.65)
People under 50 are just phones and headphones listening to streaming services and youtube. Rare to be in a house of a younger person that has a stereo. My kids all have nice tube amps, however they d .......

174: Tweakers' Asylum, So it is a circuit breaker and you replace the component fuse with a copper rod named Sluggo? (0.00)
Posted by Chip647 on 2023-03-28, 08:21:49 (172.11.32.65)
Circuit breakers are nice, however you want to make sure you don't run into safety compromises. Fire inspectors are not all that keen on fuses replaced by copper bars. .......

175: Tweakers' Asylum, weird!!! I can't see how adding an additional fuse to a system will improve things (0.00)
Posted by Chip647 on 2023-03-27, 09:09:26 (172.11.32.65)
Fuses are a weak link. .......

176: Tube DIY Asylum, It isn't a trioded EL84 or "SET". It looks like single ended pentode. (0.00)
Posted by Chip647 on 2023-03-16, 09:57:12 (172.11.32.65)
Only 2 wires coming out of the OPT primary hole means no UL. And the blue wire going to the screen goes to a rats nest under the B+ cap. Triode might be an option if 1-ish watt is acceptable versus th .......

177: SET Asylum, That's probably Steve's daughter he is making sex jokes with. Niiiiice (0.00)
Posted by Chip647 on 2023-03-11, 19:01:05 (172.11.32.65)
"Decware is a family business. This amp was named after our daughter Sarah who is also the customer service manager at Decware and one of the main people who keep this ship afloat. If you've called De .......

178: Tube DIY Asylum, Just enjoy it for what it is (0.00)
Posted by Chip647 on 2023-03-07, 05:15:53 (172.11.32.65)
You are going to be constrained by the output transformers and quality of all the parts. Putting in expensive parts here and there will just make you spend money that could better be spent saving up f .......

179: Tube DIY Asylum, RE: GXSE-10-08. Then they had to get bigger (0.00)
Posted by Chip647 on 2023-02-25, 08:55:28 (172.11.32.65)
Needed the bass .......

180: Tube DIY Asylum, GXSE-10-08 (0.00)
Posted by Chip647 on 2023-02-25, 08:46:18 (172.11.32.65)
I tried the same thing with these OPTs .......

181: General Asylum, AI is Vacuous ;-) (0.00)
Posted by Chip647 on 2023-02-25, 08:34:07 (172.11.32.65)
.......

182: General Asylum, Kind of Blue (0.00)
Posted by Chip647 on 2023-02-25, 08:32:38 (172.11.32.65)
In my opinion, it essentially marks the end of the rise of Jazz as an influential cultural phenomenon in 1959. Everything before it lead up to it, and everything after descended from it. You can read .......

183: Tube DIY Asylum, Are the magnetics chinese or Canadian? (nt) (0.00)
Posted by Chip647 on 2023-02-21, 06:36:15 (172.11.32.65)
.......

184: Tube DIY Asylum, 6SL7 w/ MOSFET source follower (0.00)
Posted by Chip647 on 2023-02-08, 07:14:55 (172.11.32.65)
Simpler, and "better": Just use ONE 6SL7 at 150v 1.7ma, one triode for each channel. 380v B+. (230v drop to get to 150v). 230/R=0.0017. Plate R=135,300 ohms Cathode at around 1.25v @ 1.7ma. 1.25/R=0.0 .......

185: SET Asylum, RE: Fi X4 Repair (0.00)
Posted by Chip647 on 2023-02-03, 12:27:21 (172.11.32.65)
Hi. Your settings don't allow for me to send you an email. Let me know how to contact you. .......

186: OTL Asylum, RE: Delayed distortion (0.00)
Posted by Chip647 on 2023-02-01, 07:38:00 (172.11.32.65)
it could be the coupling caps are starting to get a bit (voltage) leaky when they get hot. It is usually always caps when you get variability. .......

187: SET Asylum, RE: Fi X4 Repair (0.00)
Posted by Chip647 on 2023-02-01, 07:06:29 (172.11.32.65)
You could post in Tube/DIY. You can PM me if you would like me to fix it. Likely just needs to be recapped. .......

188: High Efficiency Speaker Asylum, Are you planning pro sound for a club or outdoor festival? (0.00)
Posted by Chip647 on 2023-01-30, 07:39:06 (172.11.32.65)
Line arrays are pretty much the solution with time delayed repeaters at a certain distance to maintain volume .......

189: Tubes Asylum, You are probably very safe (nt) (0.00)
Posted by Chip647 on 2023-01-25, 06:17:50 (172.11.32.65)
.......

190: Tube DIY Asylum, They likely have more life in them than you do :-0 (0.00)
Posted by Chip647 on 2023-01-24, 10:42:57 (172.11.32.65)
Not too new, too old. In general, If they play and sound good (and your volume control position is where it always is) then they have life in them. Most of the time the tubes will fail from an open f .......

191: Tubes Asylum, probably just an issue with the button switch (0.00)
Posted by Chip647 on 2023-01-23, 13:52:54 (172.11.32.65)
The button just puts the meter on that tube. If the button is not making contact it will not select the tube to display on the meter. Unless you have been fiddling with the tubes potentiometer it shou .......

192: General Asylum, RE: Enlightened Audio Design Repair in New England??? (0.00)
Posted by Chip647 on 2023-01-20, 07:36:35 (172.11.32.65)
Most likely here is your only choice. Iowa. .......

193: Tube DIY Asylum, You should play with DuncanAmps PSUII (0.00)
Posted by Chip647 on 2023-01-19, 09:06:36 (172.11.32.65)
It can show you the voltage drop at various cap input values. 10uf should not have much of a voltage reduction compared to 40uf .......

194: Tube DIY Asylum, A couple of things (0.00)
Posted by Chip647 on 2023-01-14, 13:06:56 (172.11.32.65)
Upgrade the 10uf input caps and might just as well get a better output cap (3300uf 50v) The other thing is the binding posts are tragically awful chinese stuff. I replaced them with the nifty Cardas .......

195: Tube DIY Asylum, A little bummed (Nelson Pass ACA Amp) (0.00)
Posted by Chip647 on 2023-01-10, 09:02:15 (172.11.32.65)
Recently bought an ACA amp for my birthday and put it together. 5 WPC or so. It sounds really good, particularly for $350. Signal goes through the crappiest 10uf electrolytic at the input and out t .......

196: Tube DIY Asylum, RE: K&K Maxxed-Out Help - This describes it (0.00)
Posted by Chip647 on 2023-01-10, 08:52:29 (172.11.32.65)
Part of the cathode sink replacing R103/203 .......

197: Tubes Asylum, It would "probably" be ok (0.00)
Posted by Chip647 on 2023-01-05, 14:33:40 (172.11.32.65)
The traditional "274B" has a stated max first cap of 4uf. Knowing Had's love of high capacitance, I would assume that the black dual 32uf cap poking though the top of the preamp has a section used for .......

198: Tube DIY Asylum, RE: What advantages does schottky diode have when used for DHT filament (0.00)
Posted by Chip647 on 2022-12-13, 07:24:59 (172.11.32.65)
Schottky diodes have less self generated noise. They are good for rectification. .......

199: General Asylum, It "Sounds Like" you are using the attenuators backwards (0.00)
Posted by Chip647 on 2022-12-11, 10:56:35 (172.11.32.65)
For both attenuators to heave the same "problem" you are connecting the DAC to the output of the attenuator and the amp to the input. This results in the problem you are having. Just try reversing you .......

200: Tube DIY Asylum, RE: Stacked 03D screen supply oscillating after brownout (0.00)
Posted by Chip647 on 2022-11-30, 06:04:58 (172.11.32.65)
One or both of the OD3's could be damaged. Try replacing them to see if the oscillation continues. .......

201: General Asylum, It is a very high voltage cap in the pico farad range (0.00)
Posted by Chip647 on 2022-11-26, 13:41:40 (172.11.32.65)
The glow is from the UV LED exciting the uranium glass. You can get one for $10 if you really want it. .......

202: Tube DIY Asylum, RE: What are the tubes, where's the schematic? (0.00)
Posted by Chip647 on 2022-11-21, 08:14:06 (172.11.32.65)
This is a pic of another Noobsound amp (the EL34 SE amp). No pics of the posted one. That one looks like a chinese 6SN7 into a pair of chinese 6DJ8 tubes with all 4 triodes wired in parallel. I would .......

203: Tube DIY Asylum, RE: Gentlemen, would like your opinion on this statement @ Mercury Magnetic site... (0.00)
Posted by Chip647 on 2022-11-14, 06:18:02 (172.11.32.65)
"Transformer coils are impregnated for some or all of the following reasons: Increase the overall dielectric strength. Improve the structural integrity of the coils. Reduce or eliminate winding noise. .......

204: Tweakers' Asylum, I don't know about paint color (0.00)
Posted by Chip647 on 2022-11-10, 12:01:31 (172.11.32.65)
But using a solid, well damped chassis reduces microphonics and improves shielding RF/EM. Copper and brass are better than aluminum in my book, but that is probably as much of an aesthetic choice as a .......

205: Tube DIY Asylum, Depends on your size of hammer and stick (0.00)
Posted by Chip647 on 2022-11-09, 13:11:28 (172.11.32.65)
and ears .......

206: Tube DIY Asylum, Haha, I see the 2 in stock went to zero! (nt) (0.00)
Posted by Chip647 on 2022-11-09, 12:02:46 (172.11.32.65)
.......

207: Tube DIY Asylum, If you need more, just ping me (nt) (0.00)
Posted by Chip647 on 2022-11-09, 11:59:07 (172.11.32.65)
.......

208: Tube DIY Asylum, Schottky has "no" recovery (0.00)
Posted by Chip647 on 2022-11-09, 09:17:21 (172.11.32.65)
Data sheet Note: This is a majority carrier diode, so there is no reverse recovery charge. High voltage Schottky rectifiers are pretty sweet. Cree started making them available about 10 years ago, and .......

209: Tube DIY Asylum, RE: Anyone sitting on a stash of IXCP10M45S? (0.00)
Posted by Chip647 on 2022-11-09, 08:53:25 (172.11.32.65)
Mouser has 2 IXCP10M90S in stock with more due in Feb How many 10M45s do you need? .......

210: General Asylum, ug. That's sad (nt) (0.00)
Posted by Chip647 on 2022-11-08, 09:29:59 (172.11.32.65)
.......

211: Tube DIY Asylum, Schottky (0.00)
Posted by Chip647 on 2022-11-08, 09:21:50 (172.11.32.65)
Cree or Wolfspeed Schottky are nice. The linked part below is 1.7kV at 18 amps, but there are plenty of lower capacity Schottky. However, the design and implementation of the circuit will swamp any im .......

212: General Asylum, May not be "pure", but a pair of good subwoofers do wonders for almost any system (0.00)
Posted by Chip647 on 2022-11-01, 08:45:34 (172.11.32.65)
Running full range with subs or running 100hz and above full range with subs allows for even 7 watt amps to dominate a room. .......

213: High Efficiency Speaker Asylum, RE: true compression drive bass horns ,,,, Ale / Goto .... (0.00)
Posted by Chip647 on 2022-10-27, 06:15:16 (172.11.32.65)
Here too .......

214: High Efficiency Speaker Asylum, yep (0.00)
Posted by Chip647 on 2022-10-25, 07:54:45 (172.11.32.65)
They are big. Really hard to get the time delay correct as the driver has a long path. You ether have the horn protruding way out into the room or you have a digital delay. They sound good, but not pu .......

215: SET Asylum, only 50watt MidLifeCrisis (0.00)
Posted by Chip647 on 2022-10-13, 13:04:29 (172.11.32.65)
Only 50watt. 304TL .......

216: General Asylum, As this is a 40 year old Red Book computer file storage device (0.00)
Posted by Chip647 on 2022-10-10, 07:58:49 (172.11.32.65)
I am just wondering what you think is the quality improvement mechanism at play here? Not to rehash every argument from the past 40 years, but if the improvement is read accuracy and "Jitter" reducti .......

217: Tweakers' Asylum, RE: anybody have an explanation or principal this works under? /nt (0.00)
Posted by Chip647 on 2022-10-07, 08:35:27 (172.11.32.65)
I can hazard a guess. Based on the little strings that can be moved around to null resonances I would assume that they are trying to null "noise". I could not begin to understand how the non-circuited .......

218: General Asylum, The small format Stereophile was the best (0.00)
Posted by Chip647 on 2022-10-07, 08:00:54 (172.11.32.65)
.......

219: Tube DIY Asylum, RE: Swap your 404a tubes between channels (0.00)
Posted by Chip647 on 2022-09-29, 12:54:45 (172.11.32.65)
same problem in the same channel? If so, there is something different about your wiring channel to channel that might be setting up an oscillation. You need a really fast scope to pick it up. Ferrite .......

220: Tube DIY Asylum, RE: MOSFET source follower (0.00)
Posted by Chip647 on 2022-09-29, 12:51:01 (172.11.32.65)
Looking though, your MOSFETs have a max voltage rating of 250v. You need an N-channel MOSFET with enough voltage rating, 600v and up. You don't want a High Amperage type, 2 Amp is a good amount. I hav .......

221: General Asylum, The speech is mixed to that type of speaker (0.00)
Posted by Chip647 on 2022-09-29, 07:50:31 (172.11.32.65)
Whey you play the weirdly equalized speech to a real speaker it is mixed so that it sounds too low and dull. The mix takes into account the crappy sound of the monitor speaker .......

222: Tube DIY Asylum, Swap your 404a tubes between channels (0.00)
Posted by Chip647 on 2022-09-29, 07:46:15 (172.11.32.65)
Very high frequency oscillations can do crazy things. Which begs the question, why not just use a 12AX7? If drive is the issue, use a MOSFET source follower after it. .......

223: Tweakers' Asylum, Wow! They are very honest! (nt) (0.00)
Posted by Chip647 on 2022-09-26, 08:06:44 (172.11.32.65)
.......

224: Tube DIY Asylum, It is called an electrostatic shield and is more than just a wire (0.00)
Posted by Chip647 on 2022-09-23, 08:45:49 (172.11.32.65)
The shield is attached to a wire which is grounded. Grounding the frame of the transformer is done when you bolt the transformer to the chassis. If you want to ensure a good ground of the end bells, s .......

225: High Efficiency Speaker Asylum, RE: "Polite" speakers (0.00)
Posted by Chip647 on 2022-09-22, 14:34:48 (172.11.32.65)
Add one of these .......

226: SET Asylum, Did they arrive? nt (0.00)
Posted by Chip647 on 2022-09-20, 14:52:41 (172.11.32.65)
.......

227: Tweakers' Asylum, The "knock" on chinese products is the theft of intellectual property, inferior materials and forced labor (0.00)
Posted by Chip647 on 2022-09-11, 16:01:50 (172.11.32.65)
If you are cool with that, you do you. People don't "like" to bash china, insomuch you could say people "like" to bash criminals. .......

228: Tweakers' Asylum, Those numbers are ratings. Minimum failure rate % for given conditions (0.00)
Posted by Chip647 on 2022-09-02, 07:07:32 (172.11.32.65)
For example, if the cap fails less than 5% of the time after 5,000 hours at 130c it passes that rating. Caps can live a long time, it is not like a fresh salmon expiration date at room temp or somethi .......

229: Tube DIY Asylum, USD $16.36 Unit of Measure: Each. Yikes!!! (0.00)
Posted by Chip647 on 2022-08-30, 11:21:41 (172.11.32.65)
That would hurt too much .......

230: Tweakers' Asylum, output tubes are low gain, so the input tubes benefit more from treatment (0.00)
Posted by Chip647 on 2022-08-22, 13:55:48 (172.11.32.65)
I have just caught tubes on the edge of meltdown that i was able to save from further damage .......

231: Tweakers' Asylum, RE: Audio Magic Blackout Paint? (0.00)
Posted by Chip647 on 2022-08-16, 09:20:35 (172.11.32.65)
I would do it on the small signal tubes. With power tubes it is helpful to see the tubes internals to look for arching and red plating of the tube. .......

232: SET Asylum, Just be sure your 240 volt change is compatible with the "220 Volt" equipment (0.00)
Posted by Chip647 on 2022-08-15, 12:56:23 (172.11.32.65)
if you give your equipment more voltage than specified you will burn things out. Make sure if you do the tweak that the resulting voltage to the amp is within spec. Your 240v is likely going to be clo .......

233: Tube DIY Asylum, RE: Not Jim, but. Jim McShane - Citation V (0.00)
Posted by Chip647 on 2022-08-12, 10:58:47 (172.11.32.65)
Right, so the net result is a starved heater for a potentially lower noise measurement. .......

234: Tube DIY Asylum, Not Jim, but. Jim McShane - Citation V (0.00)
Posted by Chip647 on 2022-08-12, 09:25:47 (172.11.32.65)
"missing the four 1Ω resistors in series with the 12BY7A filaments" Those are to drop the heater voltage into spec. If you have the correct voltage on the heater without them, no need to add them. :: .......

235: Amp/Preamp Asylum, You should not let the SP3A Languish (0.00)
Posted by Chip647 on 2022-07-25, 13:34:54 (172.11.32.65)
Take a look at the price on this restore. You probably just broke a signal trace playing with the tubes. There is no switching circuitry other than the switches and some wire traces. It would be worth .......

236: Tweakers' Asylum, Depends on the shift in the crossover point (0.00)
Posted by Chip647 on 2022-07-13, 13:10:37 (172.11.32.65)
Likely not to big of difference in the crossover point 12.0 to 12.33. Better to replace the electrolytic with a 12uf Film .......

237: Tube DIY Asylum, "Chinese amp builders claim..." yeahhhh (0.00)
Posted by Chip647 on 2022-07-08, 18:41:24 (172.11.32.65)
It is a 40 watt pentode tube for radio frequency service. What do you want? .......

238: Tube DIY Asylum, The real problem (0.00)
Posted by Chip647 on 2022-06-30, 09:43:54 (172.11.32.65)
Is that people do not want to deal with the total system gain structure. Preamps are great if they can be gain producing circuits, not just buffered attenuators. But for preamps to operate as a gain s .......

239: Tube DIY Asylum, RE: What's the HD going to be? nt (0.00)
Posted by Chip647 on 2022-06-28, 07:22:10 (172.11.32.65)
For a line stage with low output signals it really should not be too bad. Spacing is pretty good up there in the curves. Would never try to make a driver like this. .......

240: Tube DIY Asylum, Why not a 6SN7 with a 3K plate resistor? Pretty vertical but only 5.5db of gain (0.00)
Posted by Chip647 on 2022-06-27, 13:41:58 (172.11.32.65)
Not much Mu there. 350 v supply 3K plate load resistor 1K cathode resistor un-bypassed 8mA current with -8 grid to cathode differential 2.7K output impedance .......

241: Tubes Asylum, Often, near the close of the general tube making era (0.00)
Posted by Chip647 on 2022-06-22, 07:44:11 (172.11.32.65)
tubes were made with the most common production processes that were in demand at the time. Like in this instance, they likely had a three section tube with the characteristics of the 6CG7 and used 2 s .......

242: Tube DIY Asylum, You posted this on the tube asylum (0.00)
Posted by Chip647 on 2022-06-15, 13:52:31 (172.11.32.65)
Phoenix Connectors? Eh? .......

243: SET Asylum, yes, sorry, impedance (0.00)
Posted by Chip647 on 2022-06-15, 06:30:59 (172.11.32.65)
I do find that solid state rectification can be an improvement to the overall sound. .......

244: Tubes Asylum, Isn't NYC the prime meridian? (nt) (0.00)
Posted by Chip647 on 2022-06-14, 14:00:07 (172.11.32.65)
.......

245: Tube DIY Asylum, 2A keeps blowing up my tubes (nt) (0.00)
Posted by Chip647 on 2022-06-14, 13:41:38 (172.11.32.65)
.......

246: General Asylum, Whats a "CD"? (0.00)
Posted by Chip647 on 2022-06-13, 12:26:28 (172.11.32.65)
On the other side, I have been very impressed with the LP packaging from various vinyl shippers. Just my opinion, but Amazon is evil. Just download WAV or better and bin the jewel case. .......

247: Tube DIY Asylum, RE: Yes, it can be grounded. (0.00)
Posted by Chip647 on 2022-06-13, 08:15:03 (172.11.32.65)
Remember a few years back, the hot setup was to use a pipe cutter to remove the metal outer shell to use them "nude" because, you know, modders. If the outside shell is not connected to one of the le .......

248: SET Asylum, Generally, "lower" is better (0.00)
Posted by Chip647 on 2022-06-11, 16:50:44 (172.11.32.65)
Lower resistance, lower capacitance, lower inductance, lower ESR Caps that achieve an acceptable level of ripple and regulation tend to sound better. That being said, choke input filters can enable lo .......

249: SET Asylum, The little 304tl is pretty nice (0.00)
Posted by Chip647 on 2022-06-07, 11:08:23 (172.11.32.65)
Winter amp .......

250: Tube DIY Asylum, Yes Those are awesome (nt) (0.00)
Posted by Chip647 on 2022-06-01, 17:15:03 (172.11.32.65)
.......

251: Tube DIY Asylum, The caps need to radiate heat, best option is to enclose the tube (nt) (0.00)
Posted by Chip647 on 2022-05-02, 16:22:11 (172.11.32.65)
.......

252: Tubes Asylum, You have a measurement problem (0.00)
Posted by Chip647 on 2022-04-27, 13:58:53 (199.81.206.167)
The DCR of a fuse, regardless of rating, is under 0.3 ohms. You ether have bad contacts between your resistor and fuse, your meter is not sensitive enough, dirty contacts, etc. Don't fret about DCR of .......

253: Inmate Central, good time to have cash to invest... in a bubble market? (0.00)
Posted by Chip647 on 2022-04-26, 07:44:05 (172.11.32.65)
What would you put your 100k in? .......

254: Inmate Central, RE: Paying off mortgage early in today's environment (0.00)
Posted by Chip647 on 2022-04-26, 06:24:54 (172.11.32.65)
If you have the cash to pay off the loan, and you have additional cash to cover 6 months of living expenses then ask yourself this question: Would you borrow money on margin at 2.8% to invest in the s .......

255: Tube DIY Asylum, It is either the cord or the power socket on the amp. (0.00)
Posted by Chip647 on 2022-04-22, 07:16:35 (172.11.32.65)
You should replace both, most likely. .......

256: Tube DIY Asylum, Good amplifiers sound amazingly similar (0.00)
Posted by Chip647 on 2022-04-14, 06:15:51 (172.11.32.65)
The common thread is not topology, it is quality. .......

257: Tube DIY Asylum, Do you think he knows about Ohms law? (0.00)
Posted by Chip647 on 2022-03-31, 16:56:21 (172.11.32.65)
You are obviously correct, no current will result in no drop across a resistor. I would suggest that this type of DIY would be best served implementing a tried and true design. .......

258: Tube DIY Asylum, The voltage for the driver tubes are similar to the output tubes so not needed (0.00)
Posted by Chip647 on 2022-03-28, 11:44:56 (172.11.32.65)
The extra RC filtering for driver tubes takes down the B+ voltage a bit. There really is no reason to go through the weight and expense of duplicating the same voltage B+ power supply on a smaller sca .......

259: Tube DIY Asylum, high end laptop (0.00)
Posted by Chip647 on 2022-03-07, 07:26:37 (172.11.32.65)
Using the headphone out of the laptop? Both of your laptop preamp options are microphone preamps. Are you working on a vocal or instrument rig? If Audio, use an audio USB DAC like the Audioengine D1 ( .......

260: Tube DIY Asylum, depends on what you are driving the amp with (0.00)
Posted by Chip647 on 2022-03-06, 18:03:27 (172.11.32.65)
The input sensitivity is the input signal to drive the amp to full power. 1 volt with no feedback or 1 volt with 20db of feedback to achieve full power is still 1 volt on the input. That is just one f .......

261: Tubes Asylum, Wow, you need to franchise! (nt) (0.00)
Posted by Chip647 on 2022-03-02, 08:33:59 (172.11.32.65)
.......

262: Tube DIY Asylum, but you probably have a phono preamp as well (0.00)
Posted by Chip647 on 2022-03-01, 06:24:19 (172.11.32.65)
Just make sure your phono preamp can output +1v. It should do this easily. .......

263: Tube DIY Asylum, yep (0.00)
Posted by Chip647 on 2022-02-28, 06:52:18 (172.11.32.65)
Aikido with 6SN7 has an input gain of 10.5 (20dB) One volt in would be 10 volts out. This should easily drive the Amity with a "CD Level" input over 1 volt. Output impedance is less than 1K ::: TOPIC: .......

264: Tube DIY Asylum, "Metalized film" is the process used in the regular black Solens (0.00)
Posted by Chip647 on 2022-02-05, 16:55:42 (172.11.32.65)
The metalized film is a thin layer of metal deposited on the insulator film, something like a spray then rolled up. The foil is a separate metal foil element. The reason the foil does not come in larg .......

265: Tube DIY Asylum, $303 is cheap. Mouser has them for $350 in stock. (0.00)
Posted by Chip647 on 2022-02-04, 20:00:21 (172.11.32.65)
Just bite the bullet, used ones you never know how they may have been treated to save 50 bucks. That is a lot of iron for the money. I am currently using 3 pairs of these in 3 different amps, I agree .......

266: Tube DIY Asylum, FYI A cheater plug got rid of most of the residual hum (0.00)
Posted by Chip647 on 2022-02-02, 09:57:44 (172.11.32.65)
I will have to try the back to back diodes on the power ground .......

267: Tube DIY Asylum, Thanks all! (nt) (0.00)
Posted by Chip647 on 2022-02-01, 16:22:56 (172.11.32.65)
.......

268: Tube DIY Asylum, It is way down and really is not an issue, but... (0.00)
Posted by Chip647 on 2022-02-01, 07:21:18 (172.11.32.65)
It is hard to say "done" when one keeps thinking about possible sources and remedies. Particularly when my wife comes in with, "I can still hear some hum, but it is really quiet." The problem solving .......

269: Tube DIY Asylum, How far do you chase hum? (0.00)
Posted by Chip647 on 2022-01-31, 17:18:39 (172.11.32.65)
My latest amps have a 60hz hum of 0.25mV, a quarter of a millivolt. They are on sensitive horns so when everything is dead quiet, no music playing and the house is quiet, you can just barely hear a sl .......

270: Tube DIY Asylum, RE: Are you using metal film resistors? Everywhere? (0.00)
Posted by Chip647 on 2022-01-26, 13:07:34 (172.11.32.65)
Use 1 to 2 watt metal films or Mills Wire wound everywhere. Even the "right" resistors will make current noise in such a high gain circuit. Be 4x or 10x current rating for each one. .......

271: Tube DIY Asylum, Are you using metal film resistors? Everywhere? (0.00)
Posted by Chip647 on 2022-01-26, 06:30:02 (172.11.32.65)
The 2 watt dales are quiet. The hiss is often current noise from resistors. Power supply mills 12 watt wirewound. .......

272: Tubes Asylum, That can be done with the FF (0.00)
Posted by Chip647 on 2022-01-25, 16:41:52 (172.11.32.65)
There is an unnecessary 12AX7 in there, :-) .......

273: Tubes Asylum, Why not fix the FF? (0.00)
Posted by Chip647 on 2022-01-20, 13:40:14 (172.11.32.65)
It is extremely fixable and if you still don't like it you could then sell it as a working preamp. Most anything new you want to buy in under $2k is going to be chinese. .......

274: Tube DIY Asylum, One is fine (0.00)
Posted by Chip647 on 2022-01-19, 14:52:57 (172.11.32.65)
A tube rectifier requires no heater balancing since the HT has bigger noise problems to worry about (high voltage ripple for example) .......

275: Tube DIY Asylum, Quick Question: What is a fully balanced Single Ended amp? (0.00)
Posted by Chip647 on 2022-01-19, 11:59:08 (172.11.32.65)
Just use a SOWTER TYPE 3575 on the input so you can use a balanced input signal .......

276: Tube DIY Asylum, RE: Tiny regular tapping noise at 53 BPM (0.00)
Posted by Chip647 on 2022-01-10, 10:22:03 (172.11.32.65)
The plate choke might be picking up noise from near by sources or the Coleman regulator itself. Try moving the preamp to a slightly different location. If you are feeding the Coleman regulator with 1 .......

277: Tube DIY Asylum, RE: High Voltage Resistors (0.00)
Posted by Chip647 on 2022-01-06, 17:01:46 (172.11.32.65)
Series String, what is the total voltage of the string and how many elements? .......

278: Tube DIY Asylum, Shorting R5 - no music (0.00)
Posted by Chip647 on 2022-01-01, 13:18:05 (172.11.32.65)
That is a finding! Shorting R5 does nothing to the circuit except removing the feedback loop. I suspect your output transformer is miss-wired or you have hooked the output transformer up wrong (posit .......

279: Tube DIY Asylum, Agree, Hammond's chinese stuff is not like the Canadian production (0.00)
Posted by Chip647 on 2022-01-01, 13:06:28 (172.11.32.65)
It is kinda gross. Sad. .......

280: Tube DIY Asylum, Yes Just ground the top of R5 which will ground the negative feedback (0.00)
Posted by Chip647 on 2021-12-30, 21:16:46 (172.11.32.65)
Just to see the impact on the hum. You might just have a run of the mill ground loop if grounding R3 quiets the hum. If so, it is a lot of trial and error to find, lifting and changing signal ground p .......

281: Tube DIY Asylum, Could be a ground loop if shorting R3 works (0.00)
Posted by Chip647 on 2021-12-30, 17:34:19 (172.11.32.65)
If that does not work, try lifting the negative feedback by shorting R5 .......

282: Tube DIY Asylum, Any suggestions or comments appreciated (hopefully....) (0.00)
Posted by Chip647 on 2021-12-22, 12:35:59 (172.11.32.65)
It is best just to eliminate all but the ones needed to measure output tube current if this is present. You could also put in a test point right next to the output tube for that. If you need to measur .......

283: Tube DIY Asylum, RE: So the Crown input sensitivity is pretty low (0.00)
Posted by Chip647 on 2021-12-08, 12:06:14 (172.11.32.65)
Yeah, I know, but just removing the first stage cathode bypass capacitor (C5) will give you a meaningful drop in gain and solve most of the gain mismatch problems. .......

284: Tube DIY Asylum, So the Crown input sensitivity is pretty low (0.00)
Posted by Chip647 on 2021-12-08, 06:30:31 (172.11.32.65)
What is the driver tube of the 2A3? It might be pretty easy to reduce the input sensitivity of the 2A3 which is a far better sonic solution compared to padding down the input signal. .......

285: Tube DIY Asylum, His Bass amp is currently at Max Gain in Both Channels (0.00)
Posted by Chip647 on 2021-12-07, 12:34:12 (172.11.32.65)
That sounds more like to fixable problem. What is this Bass amp? Does it have its own crossover? Where is the crossover? .......

286: Tube DIY Asylum, Biasing the grid into cut-off at startup should offer some protection (0.00)
Posted by Chip647 on 2021-12-02, 13:14:28 (172.11.32.65)
Just thinking through how things work, I could not find a direct answer. When the tube is hot, a very negative grid (cut-off) will repel electrons boiled off the cathode from hitting the plate. When t .......

287: Tube DIY Asylum, I love the compact layout (0.00)
Posted by Chip647 on 2021-11-22, 06:30:28 (172.11.32.65)
Very difficult! I have been lately resorting to a pretty amp with a remote black box power supply connected with Amphenol military connections. .......

288: Tube DIY Asylum, Marketing (0.00)
Posted by Chip647 on 2021-11-16, 13:17:38 (172.11.32.65)
Bridging an amp just puts both channels onto one set of outputs, e.g. 4 transistors to 8 transistors. If you have a stereo 100WPC amp, bridging it theoretically will produce 200W on the one combined c .......

289: General Asylum, Variac and meter (0.00)
Posted by Chip647 on 2021-11-16, 08:19:18 (172.11.32.65)
If your AC is rising and falling every minute you have a serious power distribution issue. .......

290: Tube DIY Asylum, RE: Power Supply/amp troubleshooting (0.00)
Posted by Chip647 on 2021-11-13, 18:53:27 (172.11.32.65)
You can estimate the current draw by measuring the voltage drop over the 4.7 ohm resistors and using OHMs law. .......

291: Tube DIY Asylum, RE: Power Supply/amp troubleshooting (0.00)
Posted by Chip647 on 2021-11-12, 20:21:30 (172.11.32.65)
What do the 4.7 Ohm resistors do? Is there a load on the power supply? What is the AC measurement of the resulting DC supply (ripple)? Is your concern the 474v versus the expected 520v? Can you take a .......

292: Tubes Asylum, You will have a less biased survey if you ask this in General rather than "Tubes" (0.00)
Posted by Chip647 on 2021-11-09, 11:01:48 (172.11.32.65)
I have 4 current systems set up and they all use tubes and solid state amplifiers (for low frequency) combined .......

293: Tube DIY Asylum, Alternatively, a sub with a line level crossover works too (0.00)
Posted by Chip647 on 2021-11-07, 08:53:42 (172.11.32.65)
Currently I am running some Klipsch speakers full range with a sub that can be switched on and level set for taste. Avoids mucking up the primary signal. In addition, it allows the system to have a gr .......

294: Tweakers' Asylum, Does anyone know if these are UL certified and actually current tested? (0.00)
Posted by Chip647 on 2021-11-03, 12:53:23 (172.11.32.65)
Website does not indicate. Obviously a 10ga seven 9s solid copper or silver wire would be the top achievable fuse replacement. The rest lay on the spectrum. Has anyone broke open a dead one? ::: TOPIC .......

295: Tweakers' Asylum, RE: Finding a midrange driver (0.00)
Posted by Chip647 on 2021-11-02, 13:15:54 (172.11.32.65)
Nice .......

296: Tube DIY Asylum, Obvious forgeries, no 12AX7 in sight!!!!! (nt) (0.00)
Posted by Chip647 on 2021-10-18, 11:08:29 (172.11.32.65)
.......

297: Tube DIY Asylum, It could also be your distortion calculation method is different than theirs (0.00)
Posted by Chip647 on 2021-09-16, 06:57:01 (172.11.32.65)
What is the power at 10% distortion? .......

298: Tube DIY Asylum, Yikes! There certainly is a lot of stuff on the internet (0.00)
Posted by Chip647 on 2021-09-13, 12:14:36 (172.11.32.65)
It even makes sparks!!! .......

299: Tube DIY Asylum, RE: Krohn Hite UF-101 6550 testing data. (0.00)
Posted by Chip647 on 2021-09-01, 08:57:25 (172.11.32.65)
On Page 14 of this it indicates 550V on the plates. The table on page 11 voltages does not agree. You might be best to measure the actual voltage in the amp. It is a UL amp and there probably is some .......

300: General Asylum, RE: Is it possible ... that really you need a very good subwoffer (0.00)
Posted by Chip647 on 2021-08-28, 17:38:35 (172.11.32.65)
Hearing is very personal. But a thump you can feel is universal. .......

301: SET Asylum, "I would not believe the level of sonic improvement" and you should not (0.00)
Posted by Chip647 on 2021-08-28, 17:36:17 (172.11.32.65)
The reason people have a cult fanaticism around the "super hard" 5AR4s is due to the lower plate resistance in very good 5AR4s. With a DAC you are getting zero benefit from a tube that passes 250ma of .......

302: Tubes Asylum, Those pins look heavily oxidized (0.00)
Posted by Chip647 on 2021-08-22, 14:38:55 (172.11.32.65)
Clean your pins, they will sound better. .......

303: Tube DIY Asylum, RE: Stumped about problem with hum in new amp build, HF22 clone (0.00)
Posted by Chip647 on 2021-08-22, 14:09:33 (172.11.32.65)
There are 3 ways you would have DC voltage on the grid of the output tubes: 1. You are not grounding the grid resistors (R15 and R17) Check that ground point to be "earth" zero resistance. 2. You have .......

304: Tube DIY Asylum, RE: Do you want a unity gain buffer or a gain stage? (0.00)
Posted by Chip647 on 2021-08-21, 19:56:50 (172.11.32.65)
Just said 801a is interesting. Most amps need less than 1v to go to full power so line stages are 99.9999% used as buffers .......

305: Tube DIY Asylum, I prefer not to use tube microphonics to accentuate the perception of signal treble (nt) (0.00)
Posted by Chip647 on 2021-08-21, 12:14:50 (172.11.32.65)
.......

306: Tube DIY Asylum, Do you want a unity gain buffer or a gain stage? (0.00)
Posted by Chip647 on 2021-08-21, 12:11:46 (172.11.32.65)
How much gain? You want a preamp to do what exactly? If you have an amp with 0.2v sensitivity to full power it changes what you are looking for. That being said, low mu power tubes like the 10/801a ar .......

307: SET Asylum, Open the bottom of the chassis and take a pic (0.00)
Posted by Chip647 on 2021-08-07, 19:04:06 (172.11.32.65)
With some of these chinese things repair is sometimes impractical. (switch mode power supplies, transistors, surface mount parts, dodgy circuit boards, dodgy caps that will take out transformers, etc. .......

308: Tube DIY Asylum, Can you show a resistor in a circuit where you are concerned? (0.00)
Posted by Chip647 on 2021-07-03, 10:39:44 (172.11.32.65)
Go three times the watt rating you calculate for the position in the circuit. If you are worried about the resistor shorting out from high voltage arc, look at wire wound Mills. Show what you are conc .......

309: General Asylum, Stick with your current arrangement (nt) (0.00)
Posted by Chip647 on 2021-07-01, 17:45:42 (172.11.32.65)
.......

310: Tube DIY Asylum, RE: Easy boost to a Darling circuit? (0.00)
Posted by Chip647 on 2021-06-20, 09:06:09 (172.11.32.65)
Did you build the amp? If you did not, just leave it alone or sell it and get a 6V6 SE or PP amp. The power supply and the output transformers you currently have may not support more current. You will .......

311: General Asylum, What do you think of the new Dolby Atmos versions on Apple Music? (0.00)
Posted by Chip647 on 2021-06-11, 15:24:29 (172.11.32.65)
Spacial Enhancement or monstrosity? I'm in the latter camp. Post processing of phase effects has been a bane of mine since Bob Carver's Sonic Holography. .......

312: Tube DIY Asylum, Not so much a mistake, but a different way (0.00)
Posted by Chip647 on 2021-06-11, 15:10:41 (172.11.32.65)
Thank god for John though. What an active mind, I really envy his energy. Good power supplies can be expensive. I appreciate his Aikido noise injection concept. I bought one of his boards a while back .......

313: Tube DIY Asylum, RE: Noise reduction/ heating. (0.00)
Posted by Chip647 on 2021-06-10, 16:04:54 (172.11.32.65)
Rarely will just adding shielding help with basic issues like you have. You can start by working on the heater supply. Raise the heater to around 40 volts above ground. Read the linked article. Layout .......

314: Tube DIY Asylum, And Dimmers (nt) (0.00)
Posted by Chip647 on 2021-06-05, 09:36:35 (172.11.32.65)
.......

315: Tube DIY Asylum, RE: Anyone Tried the 6N15P Dual Triode? (0.00)
Posted by Chip647 on 2021-05-22, 12:05:46 (172.11.32.65)
They are a straight-forward copy of the 6J6-A with the same essential electrical characteristics. The old JAN tubes are really good and cheap; I have never found a reason to try the russian copies. I .......

316: Tube DIY Asylum, A choke is used to smooth out the DC by way of inductance (0.00)
Posted by Chip647 on 2021-05-08, 17:22:21 (172.11.32.65)
Tiny chokes have tiny inductance which don't filter B+ very well. Voltage regulators at high current can be noisy too. Measure each section .......

317: SET Asylum, What did he do to it? (nt) (0.00)
Posted by Chip647 on 2021-05-08, 14:55:57 (172.11.32.65)
.......

318: Tubes Asylum, Most likely, changing the brand of tubes will not help much. (0.00)
Posted by Chip647 on 2021-05-03, 11:58:54 (192.189.187.101)
It sounds like there is a problem with how the preamp is designed. .......

319: General Asylum, That is not how "income" works. (0.00)
Posted by Chip647 on 2021-05-01, 16:49:40 (172.11.32.65)
You buy an amp for $2000 and sell it for $1000 you have a $1000 LOSS that you can use to offset any gains on something you actually made money on. Keep records! If you are taxed on the selling price t .......

320: Tube DIY Asylum, Just use a washer, rivets are a PITA to change (nt) (0.00)
Posted by Chip647 on 2021-04-17, 16:20:33 (172.11.32.65)
.......

321: General Asylum, The Human form is pretty terrifying (Try listening to anything "Top 40" today and you will loose your mind) nt (0.00)
Posted by Chip647 on 2021-04-17, 07:21:12 (172.11.32.65)
.......

322: Tube DIY Asylum, you can try one or the other or both, however (0.00)
Posted by Chip647 on 2021-04-06, 19:52:47 (172.11.32.65)
It will not, however, turn your amp Metal. The tone might become harsher as opposed to producing creamy distortion. It might interact with the tremolo. Or, just get a good preamp pedal with enough gai .......

323: Tube DIY Asylum, Yeah, in the guitar amp world that is a "bright" cap (0.00)
Posted by Chip647 on 2021-04-03, 16:09:39 (172.11.32.65)
However, it is too small to work other than to improve the measurements to 20khz. I would leave it out. .......

324: Tube DIY Asylum, Mouser (0.00)
Posted by Chip647 on 2021-03-28, 08:37:08 (172.11.32.65)
Click on the link. Pretty much anything you are looking for can be found at Mouser or Digi-Key .......

325: Tube DIY Asylum, RE: Please teach me this cathode bypass question (0.00)
Posted by Chip647 on 2021-03-28, 08:24:19 (172.11.32.65)
As drawn they are electrically the same. You will see a configuration with the 300 ohm resistor on the bottom of the stack when global feedback is applied to the junction of the 3K and 300ohms. Normal .......

326: Tube DIY Asylum, RE: The amp just the one gain stage (0.00)
Posted by Chip647 on 2021-03-23, 09:19:38 (172.11.32.65)
Right now, A Twisted Pear Buffalo III with a tube I/V converter through a "Slagelformer" autoformer fed by various digital front ends. .......

327: Tube DIY Asylum, The amp just the one gain stage (0.00)
Posted by Chip647 on 2021-03-22, 14:01:20 (192.189.187.103)
That is why I wanted as much out of the 6SL7 as possible. If the 6SL7 does not end up being the end all, I will make the amp a low gain amp with a 6SN7 and put a real preamp in front of it. ::: TOPIC: .......

328: Tube DIY Asylum, RE: I ended up with 1.6mA, 180v plate, 750 cathode resistor (0.00)
Posted by Chip647 on 2021-03-21, 12:02:20 (172.11.32.65)
Basically cleaning out the closet. I have 2 pair of old KR 842 (big 300b) tubes, a Pete Millet A2 driver board, a pair of Welborne Labs MOSFET Capacitance multiplier power supply boards, the C4S, a pa .......

329: Tube DIY Asylum, I ended up with 1.6mA, 180v plate, 750 cathode resistor (0.00)
Posted by Chip647 on 2021-03-20, 14:47:15 (172.11.32.65)
The C4S drops about 120 volts to the plate. I guess this is an OK operating point. Thanks .......

330: Tube DIY Asylum, RE: CCS question about 6SL7 Cathode Resistor (0.00)
Posted by Chip647 on 2021-03-19, 16:30:33 (172.11.32.65)
A Pete Millet A2 driver board. I know, the current should not be the primary concern doing the, however I wanted to better understand the parameters. .......

331: Tube DIY Asylum, RE: CCS question about 6SL7 Cathode Resistor (0.00)
Posted by Chip647 on 2021-03-19, 15:42:58 (172.11.32.65)
Thanks. That is what I ended up figuring the max current I could get was just over 1mA at 240v. The tube max voltage is 300 so there is not a lot of range. Fun to learn something. .......

332: Tube DIY Asylum, CCS question about 6SL7 Cathode Resistor (0.00)
Posted by Chip647 on 2021-03-19, 14:00:02 (172.11.32.65)
I have an old Bottlehead C4S constant current load. Am I thinking about this right? I have it set up for 2.5mA. Testing it across a 30K resistor to ground with a 300v supply yields 75 volts across the .......

333: Tubes Asylum, Strange chinese manufactures printed something "audiophile" on a shrink wrap? (nr) (0.00)
Posted by Chip647 on 2021-03-16, 20:46:34 (172.11.32.65)
.......

334: Tube DIY Asylum, How do you get rid of the dc offset with line flictuations? (nt) (0.00)
Posted by Chip647 on 2021-03-16, 20:26:34 (172.11.32.65)
.......

335: Tubes Asylum, And short the inputs (nt) (0.00)
Posted by Chip647 on 2021-02-24, 15:00:18 (172.11.32.65)
.......

336: Tubes Asylum, RE: Tube with "tip" broken off...... (0.00)
Posted by Chip647 on 2021-02-18, 08:15:47 (172.11.32.65)
Bugs .......

337: Tube DIY Asylum, They make A2 a heck of a lot easier and cheaper (and better) (0.00)
Posted by Chip647 on 2021-02-13, 20:23:16 (172.11.32.65)
I agree for gain, but for current driving and CCS, they are good. .......

338: Tubes Asylum, The 300b setting will tell you if the tube is bad (0.00)
Posted by Chip647 on 2021-02-12, 20:35:04 (172.11.32.65)
the 842 has a higher filament draw and a higher plate wattage rating. Other than that they are pretty similar .......

339: Tube DIY Asylum, Wavey Gravy (0.00)
Posted by Chip647 on 2021-02-07, 14:42:04 (172.11.32.65)
A little thickness on the top plate goes a long way!!! .......

340: Tube DIY Asylum, RE: Martin Logan CLS transformer (0.00)
Posted by Chip647 on 2021-01-30, 20:51:25 (172.11.32.65)
You probably just need to replace it. A 1:50 to 1:75 ratio will work. See link. .......

341: Tube DIY Asylum, You can use one leg of the AC heater to the bias resistor junction (0.00)
Posted by Chip647 on 2021-01-19, 20:36:52 (172.11.32.65)
However, the fake center tap is used to "balance" the AC supply for the heater to make it quieter. You will often see old schematics with one leg of the AC heater supply grounded and the other going t .......

342: Tweakers' Asylum, RE: First X-over build help please (0.00)
Posted by Chip647 on 2021-01-13, 10:04:42 (172.11.32.65)
Yes, the yellow marked items are just where the wires cross and are not connected. Leave a 1/2 inch between the resistors and the other components as the resistors will heat up .......

343: Tube DIY Asylum, did you use the same values or did you "upgrade" them? (nt) (0.00)
Posted by Chip647 on 2021-01-11, 16:20:05 (172.11.32.65)
.......

344: Tubes Asylum, Part of the issue is the massive gain of your preamp (0.00)
Posted by Chip647 on 2021-01-07, 18:15:38 (172.11.32.65)
Just some advise. Your preamp has 30db of gain. Rather, you need an impedance matching zero gain attenuator. With this preamp, an input signal of 120mV is amplified to a 2V output (no phono stage) an .......

345: Amp/Preamp Asylum, Audiophillia has never been about the actual sound in your room (0.00)
Posted by Chip647 on 2021-01-02, 16:37:12 (172.11.32.65)
It is about the prestige of the brand name, the machining of the front panel, the weight of the component, the imposing visual appearance, the visceral impression on visitors viewing your system for t .......

346: Tube DIY Asylum, The 27 is indirectly heated, however there should be some current flowing (0.00)
Posted by Chip647 on 2020-12-29, 21:26:45 (172.11.32.65)
There is either a bad part or a bad solder connection. He should try drawing a complete schematic. .......

347: Tweakers' Asylum, They typically use as cheap / garbage chinese transformers (0.00)
Posted by Chip647 on 2020-12-25, 11:27:14 (172.11.32.65)
You should build one yourself with a decent toroidal transformer. A great starter project. .......

348: Tube DIY Asylum, Funny you should ask (0.00)
Posted by Chip647 on 2020-12-16, 16:41:58 (199.81.206.146)
I have a set of Pete Millet's A2 driver boards with the funky Landfall Systems heat sink contraptions assembled and sitting on my desk. I am building an A1 amp around the uprated 300b I bought a long .......

349: Tube DIY Asylum, That is horrible (0.00)
Posted by Chip647 on 2020-12-16, 11:45:31 (199.81.206.164)
Their stuff has been harder to get recently, I though it would be due to higher demand. I guess the people who can build are all sunsetting I am doing my best to teach young people how to build amps .......

350: Tube DIY Asylum, Or, just turn the guitar 45 degrees, or stand a little farther from the amp (0.00)
Posted by Chip647 on 2020-12-15, 16:42:20 (172.11.32.65)
There are a tone of different tone circuits and complexities in the guitar/amp interface. It is an interesting concept, a passive humbucker. .......

351: Tube DIY Asylum, Yeah, EL34 is a great way to go (0.00)
Posted by Chip647 on 2020-12-15, 12:04:01 (199.82.243.97)
Great tone for a Marshal type build. .......

352: Tube DIY Asylum, Without any trouble at all (0.00)
Posted by Chip647 on 2020-12-15, 11:48:24 (199.82.243.97)
I use this type of MOSFET source follower to drive heavy A2 loads, upwards of 10 watts. It really depends on how hard you are pushing into A2 positive bias If you stay in A1 your benefit is low AC imp .......

353: Tube DIY Asylum, RE: Tubelab vs Bartola (0.00)
Posted by Chip647 on 2020-12-14, 08:50:06 (199.81.206.157)
Tubelabs is simpler and you can build it with point to point with no boards. Bartola's uses his boards, is more complex but you will get some support and circuit boards. Sound wise, if you use the sam .......

354: General Asylum, RE: Great example of unit that measures great but sounds like crap? (0.00)
Posted by Chip647 on 2020-12-11, 20:07:49 (172.11.32.65)
This was pretty universal .......

355: Tubes Asylum, it is kind of a stupid tube IMO (0.00)
Posted by Chip647 on 2020-12-09, 17:09:25 (172.11.32.65)
Not a stupid tube IMO .......

356: Tubes Asylum, RE: Tung-Sol soon to release KT 170 power tube! (0.00)
Posted by Chip647 on 2020-12-08, 12:20:37 (192.189.187.113)
Kronzilla .......

357: Tube DIY Asylum, RE: Loud Hum in 1 Channel of AE-25 Tube Amp.... Now Gone...... (0.00)
Posted by Chip647 on 2020-12-06, 16:59:27 (172.11.32.65)
Tube pin contact with socket dirty, intermittent/cold solder joint .......

358: Tube DIY Asylum, Guitar amps are very weird (0.00)
Posted by Chip647 on 2020-12-04, 08:41:55 (172.11.32.65)
I would start out with as close as possible a circuit based on a tried and true guitar amp design. Once that works, is reasonably quiet and is reasonably playable then you can modify from there one st .......

359: Tube DIY Asylum, I have built about 10 guitar amps (0.00)
Posted by Chip647 on 2020-12-03, 19:04:56 (172.11.32.65)
Everything from a bass amp based on the Fender PS300 transformers to the SE45. One of my favorites is using the 6L6 to KT88 in single ended with three gain stages. The trick is getting a clean sound t .......

360: Tube DIY Asylum, RE: Guitar Amp Project (0.00)
Posted by Chip647 on 2020-12-03, 17:00:34 (172.11.32.65)
If you wanted to get fancy you could replace the cathode follower driving the tone stack with a MSOFET source follower and you will not have the problem of a 12AX7 in that stressful location. In a ho .......

361: Tubes Asylum, Its on the upper end, but OK They can last a long time (nt) (0.00)
Posted by Chip647 on 2020-12-03, 09:13:46 (172.11.32.65)
.......

362: Tubes Asylum, Are you buying or selling? (0.00)
Posted by Chip647 on 2020-12-03, 08:18:26 (172.11.32.65)
$50 sounds fair if you are buying. If you are selling, anything you want. Call them "BAD BOY CROME DOME SUPER TUBES" or something an ask $200 Those do not look like they are original boxes so "NOS con .......

363: Tube DIY Asylum, Your preamp power supply will be Class-A DC with a constant current draw (0.00)
Posted by Chip647 on 2020-11-29, 11:13:02 (172.11.32.65)
How do you measure the phase of DC? You are applying AC coupling cap signal theory to a DC power supply. Just use a choke that has plenty of current capacity for the job and around 10H. You did not in .......

364: Tubes Asylum, Vacuumware (nt) (0.00)
Posted by Chip647 on 2020-11-20, 12:19:06 (172.11.32.65)
.......

365: Tube DIY Asylum, RE: Guitar amp output transformer question (0.00)
Posted by Chip647 on 2020-11-15, 14:35:59 (172.11.32.65)
It will be fine. There can be some pleasing distortion from overdriving an output transformer, however you will be needing to turn the amp up to 11 and attenuate the output if you want to use it in a .......

366: General Asylum, RE: "Fever" Grade Audio Components (0.00)
Posted by Chip647 on 2020-11-01, 16:21:50 (172.11.32.65)
English: The hottest sounding parts for a premium listening experience, simply audiophile ecstasy Google Translate Chinese: 最熱的發聲部件，帶給您高品質的聆聽體驗 Google Translate English: The hottest sound component, b .......

367: General Asylum, They open the box, figure out what is inside then go to the internet to figure out the market value? (0.00)
Posted by Chip647 on 2020-10-31, 09:42:24 (172.11.32.65)
Wow! That is incredible. Are you able to describe to them how to modify their ebay listing prices to account for market and condition. This is like antique roadshow on steroids. Go Canada? ::: TOPIC:: .......

368: Tube DIY Asylum, No problem upside down for testing. (0.00)
Posted by Chip647 on 2020-10-31, 09:38:50 (172.11.32.65)
The orientation issue is filament sag making contact with or too close to the plate. Vertically there should be no sag, right side up or upside down. For long term cooling you should keep them right s .......

369: Tube DIY Asylum, I built a weird guitar amp last year: 27 to 6SL7 to 6J5 to 45 (0.00)
Posted by Chip647 on 2020-10-25, 20:53:14 (172.11.32.65)
The trouble with the voicing was to get enough distortion. Initially it came out way to clean and I had to add the 6J5 a bit starved to make it sound better. The tubes came from a shoe box someone gav .......

370: Tubes Asylum, Any place you are using them for gain (0.00)
Posted by Chip647 on 2020-10-09, 18:50:05 (108.247.77.70)
However if you are using 12AX7 in a Preamp into a 12AX7 front end you are either talking about a serious overdriven guitar amp or your equipment uses prodigious local or global feedback. You will here .......

371: Tube DIY Asylum, He was asking about parafeed output transformer arrangement (0.00)
Posted by Chip647 on 2020-10-06, 13:42:22 (108.247.77.70)
Can't get away from the output cap! .......

372: Tube DIY Asylum, Having someone competent wind it. (0.00)
Posted by Chip647 on 2020-10-06, 07:16:11 (108.247.77.70)
Like in life, how is more critical than what. The great things about separating the output transformer into a choke and step-down is that it is easier to optimize each one. It takes skill to wind a go .......

373: Tubes Asylum, RE: Audio research preamp broken (0.00)
Posted by Chip647 on 2020-09-28, 20:00:41 (108.247.77.70)
The fancy-shmancy "electronically regulated automatic 45 second warm/up brown-out mute power supply" would seem to have given up the ghost. .......

374: Tube DIY Asylum, No, not a bad solder connection, What I meant was that you are using a lot of solid state (0.00)
Posted by Chip647 on 2020-09-28, 15:54:30 (108.247.77.70)
Solid state devices can oscillate. Look at where you should have carbon comp resistors (suppressors) very close to the transistors and look at the lengths of your connecting wire. The oscillation is c .......

375: Tube DIY Asylum, nope (0.00)
Posted by Chip647 on 2020-09-28, 15:50:19 (108.247.77.70)
Make it reliable. It gets hot in there. (By the way, adding more power supply capacitance in a guitar amp can make it sound worse. This ain't hi-fi) Follow the schematic!! The "unbalanced" cathode res .......

376: Tube DIY Asylum, RE: Loud squealing noise in new project (0.00)
Posted by Chip647 on 2020-09-27, 18:13:04 (108.247.77.70)
You obviously have an oscillation and a ton of places it could pop up. Ground the input and take out the output tube. Use a meter to look for AC voltage representing the noise where it should not be. .......

377: SET Asylum, Heh, Memphis (nt) (0.00)
Posted by Chip647 on 2020-09-26, 20:50:00 (108.247.77.70)
.......

378: SET Asylum, I built these this summer (304TL) (0.00)
Posted by Chip647 on 2020-09-25, 20:46:45 (108.247.77.70)
Working on a 300b (52b) right now .......

379: General Asylum, Telecasters are single coil! (0.00)
Posted by Chip647 on 2020-09-18, 19:43:12 (108.247.77.70)
Putting a humbucker in one is kind of disrespectful! There are enough humbucker guitars out there, don't butcher a Tele. .......

380: Tube DIY Asylum, Thanks Everyone! (0.00)
Posted by Chip647 on 2020-09-16, 14:34:55 (108.247.77.70)
I really appreciate the insight! .......

381: Tube DIY Asylum, CCS Current Set Question (0.00)
Posted by Chip647 on 2020-09-15, 11:12:21 (108.247.77.70)
When using a CCS as a plate load, which of the three options is best/standard: 1. Run the CCS a few mA above the current draw of the tube 2. Try to precisely match the current draw of the tube to the .......

382: Tube DIY Asylum, RE: Best .22 ufd (450V-650V) coupling cap... (0.00)
Posted by Chip647 on 2020-09-10, 06:36:03 (108.247.77.70)
Actually, the tin foil (white) Solens are pretty good. Also, I am a big fan of the Sprague 716p film and foils. If you don't want to go Soviet, these both exceed most of the "audiophile" caps in the $ .......

383: Tubes Asylum, I think the 45DRD goes to full power at 1v or less (0.00)
Posted by Chip647 on 2020-09-07, 14:58:28 (108.247.77.70)
So you are inserting a gain stage where it is not needed. That will be noisy. You take a 2v input signal, pad it down to 0.1v so that you can amplify that back up to 1v. .......

384: General Asylum, The relationship between "db" and watts (0.00)
Posted by Chip647 on 2020-09-04, 11:27:52 (108.247.77.70)
If you have speakers that are rated for the power, increasing the power by 10x increases the "db" by 10, or in this case, decreasing. 10 watts to 100 watts theoretically increases the decibel level by .......

385: Tube DIY Asylum, Sometimes, fuses just blow. When they blow on start up... (0.00)
Posted by Chip647 on 2020-08-28, 17:03:43 (108.247.77.70)
When they blow on start up and the fuse is 3 amp and the amp draws a steady 1 amp, the turn on surge can easily exceed the 3 amp. Over time those surges can stress the fuse and it will blow. Easiest f .......

386: General Asylum, You have to boil the meat with tripe for that to be effective (tn) (0.00)
Posted by Chip647 on 2020-08-25, 16:45:26 (108.247.77.70)
.......

387: Tube DIY Asylum, RE: single primary or dual primary for PT (0.00)
Posted by Chip647 on 2020-08-13, 20:53:11 (108.247.77.70)
The Hammond 300 series have better specs than the 200 series (Less mechanical hum in circuit too). For that difference alone I would pick the 300. Dual or single primary is only a concern if you need .......

388: Tube DIY Asylum, Absolutely fine (nt) (0.00)
Posted by Chip647 on 2020-08-10, 18:05:46 (108.247.77.70)
.......

389: Tube DIY Asylum, RE: What has heater/cathode (voltage) rating got to do with this topic? (0.00)
Posted by Chip647 on 2020-08-09, 06:53:32 (108.247.77.70)
The tread is on a primary failure mode of tubes, and I would add particularly susceptibility of new manufacture Communist bloc tubes, being heater/filament failure. Over-voltage is one way to open a h .......

390: Tube DIY Asylum, What has heater/cathode (voltage) rating got to do with this topic? (0.00)
Posted by Chip647 on 2020-08-08, 16:20:49 (108.247.77.70)
Violating ratings makes tubes fail. Heater failures are common. Don't know what to tell you about your web search. I don't feel the need to do it for you. .......

391: Tube DIY Asylum, Uhhhh Really? (0.00)
Posted by Chip647 on 2020-08-06, 17:48:13 (108.247.77.70)
Go ahead and run your 6.3v heaters at 7 volts and let me know how that goes for you. Soft start of heater/filament supply stops a large current surge on cold heater/filament wires, these are very hard .......

392: SET Asylum, RE: HELP: High impedance load for SET amplifier (0.00)
Posted by Chip647 on 2020-08-06, 06:57:28 (108.247.77.70)
You will not harm the amp. The 16 ohm tap will be a fine match for the field coil. If you were able to do a frequency sweep to measure the impedance of the speaker it is highly likely that some freque .......

393: Tube DIY Asylum, The screen grid has a voltage rating (0.00)
Posted by Chip647 on 2020-08-06, 06:41:44 (108.247.77.70)
The maximum screen voltage and dissipation are specified in the tube data sheets. You respect these limits and the tube will have the same life. With Ultralinear connections and tying the screen to th .......

394: Tube DIY Asylum, RE: When strapping an output pentode to triode.... (0.00)
Posted by Chip647 on 2020-08-04, 20:17:59 (108.247.77.70)
Well, here is the thing: A triode / pentode switch is a blah idea unless you also have a feedback adjusting switch. You change the feedback and the gain will change. Flipping a pentode to triode switc .......

395: Tube DIY Asylum, I agree! (0.00)
Posted by Chip647 on 2020-08-01, 13:13:04 (108.247.77.70)
Cap orientation is really dependent on the circuit. Or if cap orientation is really something to be concerned about at all. .......

396: Tube DIY Asylum, RE: I think you're right. (0.00)
Posted by Chip647 on 2020-07-31, 20:09:45 (108.247.77.70)
So if the coupling cap had one end attached to a 50K plate load resistor and the other end hooked to the grid with a 100K grid resistor to ground, which end has the lowest impedance to "ground"? ::: T .......

397: Tube DIY Asylum, Signal? Power? Rating? (0.00)
Posted by Chip647 on 2020-07-21, 13:40:33 (108.247.77.70)
NKK C&K are both great. Click on Mouser below and pick one that has the rating you need. .......

398: SET Asylum, Waiting for Godot (0.00)
Posted by Chip647 on 2020-07-14, 13:17:14 (108.247.77.70)
Website is " 1997-2016 Western Electric Export Corporation." Me thinks it is truly all done. However, if you Venmo me a downpayment today of only $600 I can guarantee delivery of a perfect pair of WE .......

399: Tube DIY Asylum, RE: Read an article like this (0.00)
Posted by Chip647 on 2020-07-12, 07:16:47 (108.247.77.70)
The majority of the current for the circuit needs to be drawn from the top of the VR Tube Stack. If you have 50mA of load and the VR tubes are set to draw 20mA for regulation you have a 70mA total dra .......

400: Tube DIY Asylum, Read an article like this (0.00)
Posted by Chip647 on 2020-07-11, 06:20:13 (108.247.77.70)
:-) .......

401: Tube DIY Asylum, "Intended for use as a shunt control valve in stabilized power packs" (0.00)
Posted by Chip647 on 2020-07-05, 18:59:48 (108.247.77.70)
35 watt top cap tetrode? Who is marketing this as a stupendous audio tube? If you want a tetrode with a top cap and similar specs (but very cheap) look at 1625, 807, 6GB6GA and many more. .......

402: Tubes Asylum, 2 sources of heat (0.00)
Posted by Chip647 on 2020-06-24, 18:04:01 (108.247.77.70)
There is the heat the filament gives off and the heat the plate gives off. The KT66/6L6 tubes have lower heater requirements than the bigger tubes and will give off a little less heat there. As far as .......

403: Tube DIY Asylum, That is called an oscillation (0.00)
Posted by Chip647 on 2020-06-24, 17:51:13 (108.247.77.70)
Make sure your tube pins are clean and your sockets are tight. If you are a "tube roller" you could have a poor connection between a tube pin and a socket due to many insertions. If that is not solvin .......

404: SET Asylum, RE: Directly or indirectly heated driver tubes? (0.00)
Posted by Chip647 on 2020-06-22, 11:50:15 (199.82.243.84)
I have 10s driving 304tl The only limitation is keeping the noise down from stage to stage. They sound great if you can make them quiet enough. One limitation is that most directly heated tubes have l .......

405: SET Asylum, Directly Heated Single Ended True Triode (DHSETT)? (0.00)
Posted by Chip647 on 2020-06-19, 09:35:11 (108.247.77.70)
In the 6 to 8 watt output range the 300b or the PX25 are good. There are some transmitter tubes that operate in that range as well. Your sound quality will have more to do with your design, parts and .......

406: Tubes Asylum, It will not hurt anything to use that tube. (0.00)
Posted by Chip647 on 2020-06-18, 06:00:27 (108.247.77.70)
The filament rating os 2.5v with 2.5 amps, the same as a traditional 2A3. If possible, you might check the bias of the tube in circuit to make sure it is not pulling too much or too little B+ current .......

407: Tube DIY Asylum, there are 2 ratings: heater positive and heater negative (0.00)
Posted by Chip647 on 2020-06-16, 19:47:29 (108.247.77.70)
Also, in a 6DJ8 "Unit 1" has only a 50 volt average rating for heater to cathode and "Unit 2" goes up to 130. The best "tube" for the top of a stacked pair is a MOSFET .......

408: Tube DIY Asylum, One of the main ways to junk an input tube is to violate the Heater to Cathode voltage ratings (0.00)
Posted by Chip647 on 2020-06-14, 19:27:16 (108.247.77.70)
The 6922 has a 60 volt max heater negative with respect to cathode. This preamp uses stacked sections meaning that the top triode cathode sits at the plate voltage of the lower section. My guess is th .......

409: General Asylum, Most tubes "wear out" from high heater voltage and (0.00)
Posted by Chip647 on 2020-06-09, 21:11:50 (108.247.77.70)
turn on surge of a cold heater/filament. Not that hard to fix. Biasing above 70% of max plate rating is a way to prematurely kill tubes too. Violating heater to cathode ratings, and ratings in general .......

410: Tube DIY Asylum, Why not just replace the pin contact? (0.00)
Posted by Chip647 on 2020-06-07, 18:39:27 (108.247.77.70)
They come out and are replaceable .......

411: Tube DIY Asylum, RE: Williamson revisited (0.00)
Posted by Chip647 on 2020-06-05, 18:27:09 (108.247.77.70)
Are the power transformers the one with the rusty laminations? The lams could be shorted. .......

412: Tube DIY Asylum, Naaa 1,100 volts (0.00)
Posted by Chip647 on 2020-06-03, 20:24:26 (108.247.77.70)
Safe as a battery powered AM radio, (sitting on a Tesla coil) .......

413: Tube DIY Asylum, Finally Complete - 304tl (0.00)
Posted by Chip647 on 2020-05-31, 16:27:40 (108.247.77.70)
About 6 months start to finish. A real journey. .......

414: Tube DIY Asylum, RE: Nobsound 6P1 tube audio amp (0.00)
Posted by Chip647 on 2020-05-25, 12:44:32 (108.247.77.70)
You really should raise the heater to 80v above ground or your input tube will have a short life. The circuit violates the max heater to cathode voltage rating. Also, get a 30uf Solen and use it befor .......

415: Tube DIY Asylum, What you have drawn should work (0.00)
Posted by Chip647 on 2020-05-20, 21:21:24 (108.247.77.70)
Make sure the MOSFET is not touching any metal and is isolated from its back metal tab. Make sure there is no shorting to a heat sink. Test the Zener stack without the MOSFET, Just a 10K resistor to t .......

416: Tube DIY Asylum, Not about ripple on a DC supply, can generate hum? Yes (0.00)
Posted by Chip647 on 2020-05-15, 07:25:22 (108.247.77.70)
Note that with indirectly heated tubes like these, AC can be just as quiet as DC from a heater induced noise perspective if care is taken. I have had DC heated tubes hum and replaced it with AC to qui .......

417: Tube DIY Asylum, Yeah, they can (0.00)
Posted by Chip647 on 2020-05-14, 10:36:38 (108.247.77.70)
One thing to try, and something I always do regardless, is to elevate the heater ground to about 40 volts. It gets rid of the diode effect between the heater and the cathode that can rectify hum from .......

418: Tube DIY Asylum, Here is the thing with low gain tubes (0.00)
Posted by Chip647 on 2020-05-13, 22:12:43 (108.247.77.70)
You have to make sure the driver tube can supply enough signal voltage to drive the output tubes. If you set your bias voltage for the output pair at -40v and need a 70 volt signal for full power into .......

419: Tube DIY Asylum, RE: Speaking of dangerous voltage. The 304tl is alive! (0.00)
Posted by Chip647 on 2020-05-08, 17:26:52 (108.247.77.70)
The monster 1642SE Hammond It is bigger than life, 28 Pounds. .......

420: Tube DIY Asylum, 3000 volts can do very strange thing, Yes, they can jump along a web (0.00)
Posted by Chip647 on 2020-05-08, 14:53:23 (108.247.77.70)
There is not much in here, Just keep the spiders out. Voltage that high is very insidious and ill tempered. .......

421: Tube DIY Asylum, You are spot on (0.00)
Posted by Chip647 on 2020-05-08, 14:45:18 (108.247.77.70)
It is the rectifier, most likely, as the single GZ34/5AR4 is very stressed in that amp. In the good old days the Mullard GZ34 was very stout and could handle the abuse. New ones, not so much. It gets .......

422: Tube DIY Asylum, My main amp right now uses a 35t Eimac (0.00)
Posted by Chip647 on 2020-05-05, 13:57:07 (192.189.187.106)
I have a 100TH bread boarded with a MOSFET driver. The TL tubes are easy to drive. They are definitely worth it as they have a type of sonic and physical presence that draw you in. Hardest part is tr .......

423: Tube DIY Asylum, Why would someone use a giant thoriated tungsten triode that looks like that? (0.00)
Posted by Chip647 on 2020-05-05, 13:53:28 (192.189.187.106)
Because it is cool. And they sound good. And it is really hard to build. .......

424: Tube DIY Asylum, If i turn it up to 200mA I estimate the upper 20s (0.00)
Posted by Chip647 on 2020-05-04, 19:39:53 (108.247.77.70)
It is a very stout amp. The used tube I am testing with has one of the four filaments open. Pretty cool that the other three are unaffected and the tube can still be used. It opened the second time I .......

425: Tube DIY Asylum, Speaking of dangerous voltage. The 304tl is alive! (0.00)
Posted by Chip647 on 2020-05-04, 17:35:48 (108.247.77.70)
+100 lbs, each stack (I need wheels) The big big Hammond OPT 5 independent power supplies per side B+ 1,100v @ 120mA 2 Mean Well 5v power supplies per tube 6SN7 Interstage 304tl First hour was a l .......

426: Tube DIY Asylum, is he growing weed? (0.00)
Posted by Chip647 on 2020-04-30, 08:07:46 (108.247.77.70)
or Coral? .......

427: General Asylum, Give what you don't need to someone, today (0.00)
Posted by Chip647 on 2020-04-28, 20:43:08 (108.247.77.70)
After you are gone, 99% of it will be estate sale fodder benefitting no one. It brings much more pleasure to you to actually give it to someone, set it up, and allow others to enjoy music. ::: TOPIC: .......

428: Tube DIY Asylum, Uhhhhhh, plug it in, at night (0.00)
Posted by Chip647 on 2020-04-28, 20:36:53 (108.247.77.70)
What if your test said a new bulb produces 100,000 lumens and your BUT (Bulb Under Test) produced 86,231 lumens? What is your determination of your satisfaction of lighting? I don't think you can say .......

429: SET Asylum, You have posts where people say "This is a great idea!"? (0.00)
Posted by Chip647 on 2020-04-26, 21:25:21 (108.247.77.70)
+900v B+ for one. The SV572 is a 125 watt tube versus the 40 watt 300B it has a 6.3v filament I can't tell what the OPT turn ratio is, but the primary is probably over 5K. You should sell the amps and .......

430: Tube DIY Asylum, Sorry, sit a little closer to your webcam to enable a more accurate facial map (0.00)
Posted by Chip647 on 2020-04-17, 06:52:31 (108.247.77.70)
Your question has now lowered your social contract score, food rations have been cut and your internet speed has been adjusted accordingly. Have a productive day. --The State .......

431: SET Asylum, It just needs some electrolytic caps replaced (0.00)
Posted by Chip647 on 2020-04-08, 16:15:23 (108.247.77.70)
I would keep it on the bench until you can get it serviced. When they 'splode they make a mess and tend to wipe out transformers. Both channels having the same issue? .......

432: General Asylum, My upgrade has been... TIME (0.00)
Posted by Chip647 on 2020-04-08, 16:11:39 (108.247.77.70)
Listening is awesome .......

433: Tube DIY Asylum, RE: Correct fuse value (0.00)
Posted by Chip647 on 2020-04-08, 16:07:31 (108.247.77.70)
This amp has a similar tube complement as the current MB-185 The MB-185 uses: Primary Mains Fuse Rating 100/120V = 12A Ceramic Slo Blo Input Fuse 100/120V = 1A Ceramic Slo Blo Logic Fus .......

434: Tube DIY Asylum, It is basically the JE amp. Nice simple starter amp. (0.00)
Posted by Chip647 on 2020-04-02, 06:18:11 (108.247.77.70)
:-) .......

435: Tubes Asylum, no (0.00)
Posted by Chip647 on 2020-03-25, 14:52:30 (108.247.77.70)
yuck Plenty of NOS US stock .......

436: General Asylum, I have an Audio one from 1990 (0.00)
Posted by Chip647 on 2020-03-11, 05:49:30 (108.247.77.70)
It was fun at the time, but there were never shops around that sold any of it. Kind of like the Mars edition of the Sears Christmas Wishbook. There is always the internet which has everything with a c .......

437: Tube DIY Asylum, When you opened it up and saw this (0.00)
Posted by Chip647 on 2020-03-05, 12:08:35 (192.189.187.110)
What made you think you wanted to proceed? .......

438: Tube DIY Asylum, It has a pair of 6.3v 3 amp windings (0.00)
Posted by Chip647 on 2020-02-24, 19:20:55 (108.247.77.70)
I don't see your issue. It has a pair of 6.3v 3 amp windings .......

439: Tube DIY Asylum, RE: Anyone got a schematic for a preamp w/bass&treble controls other than pas Dynaco (0.00)
Posted by Chip647 on 2020-02-19, 17:34:30 (108.247.77.70)
Use Duncan's Tone Stack calculator and look at the Duncan's Baxandall. You can tailor your own. Look Here too: https://www.audioasylum.com/cgi/vt.mpl?f=tubediy&m=234460 .......

440: General Asylum, Solution (0.00)
Posted by Chip647 on 2020-02-14, 08:19:46 (108.247.77.70)
A good pair of small speakers like the Quad S-1 or S-2 A powered subwoofer A small digital amp and a DAC like something like Audioengine A used CD player with digital out (or better just stream from .......

441: Tube DIY Asylum, Tim used a Toroid (0.00)
Posted by Chip647 on 2020-01-31, 04:45:28 (108.247.77.70)
Toroids are a better choice .......

442: Tubes Asylum, Peavey Butcher (0.00)
Posted by Chip647 on 2020-01-30, 06:06:07 (108.247.77.70)
I worked on a Peavey Butcher last year, a predecessor to the amp you have (VTM 120?) Everything tested good, the tubes tested fine on a 300 volt tester, but one pair would run away. The bias on these .......

443: Tube DIY Asylum, RE: You might want to make sure your amp was designed for ECC99 (0.00)
Posted by Chip647 on 2020-01-28, 10:50:26 (199.82.243.109)
There is a grid resistance rating on all tubes and it varies by tube type. The self bias maximum grid resistance rating for a 300b is 250K and for fixed bias it is only 50K. THe issue is that if you e .......

444: Tube DIY Asylum, RE: You might want to make sure your amp was designed for ECC99 (0.00)
Posted by Chip647 on 2020-01-28, 06:36:32 (192.189.187.109)
OK, I would raise the source voltage of the second stage ECC99 so that you can use a larger (33k) load resistor, you have the voltage available. Also IMO, your 0.33uf / 330K cap coupling filter has t .......

445: Tube DIY Asylum, You might want to make sure your amp was designed for ECC99 (0.00)
Posted by Chip647 on 2020-01-28, 05:23:22 (108.247.77.70)
The current model of this "LM219ia" amp uses 12AX7. It would not be unusual for a Chinese maker to make a radical change in the front end of and amp and not change the model number, or print the wrong .......

446: Tube DIY Asylum, RE: so what am I doing wrong? (0.00)
Posted by Chip647 on 2020-01-25, 17:31:17 (108.247.77.70)
You are creating a psudo or partial choke load supply. Put in a 4 uf cap at that first position and the voltage will come up. Once you get the power supply all set up with the actual loads from the tu .......

447: OTL Asylum, RE: Audiotailor Jade OTL upgrade? (0.00)
Posted by Chip647 on 2020-01-23, 05:19:50 (108.247.77.70)
It looks like a bunch of old electrolytic caps can be replaced with newer electrolytics. The Metal Oxide resistors could be replaced with Mills wirewounds. Alternatively, it would take 5 minutes to to .......

448: Tube DIY Asylum, RE: Recommendations for using only the amp section (0.00)
Posted by Chip647 on 2020-01-20, 09:08:06 (192.189.187.124)
That will be fine. The feedback is at that tube so no issues there. The grid is grounded with a 1 meg resistor, I would probably parallel it with a 200K resistor. You are not going to hurt anything. I .......

449: SET Asylum, Looks like they are 100v (0.00)
Posted by Chip647 on 2020-01-20, 05:49:31 (108.247.77.70)
Do they make export amps? .......

450: Tube DIY Asylum, What causes that is a rising current draw (0.00)
Posted by Chip647 on 2020-01-19, 09:30:00 (108.247.77.70)
You either have a cap that is shorting with heat or a tube which is starting to run away. Somewhere you have a bad cap most likely or you would see a tube with glowing red plates. .......

451: Tubes Asylum, On Collecting Tubes (0.00)
Posted by Chip647 on 2020-01-18, 07:31:34 (108.247.77.70)
If I were a collector of rare and valuable tubes I would be selling now. I would keep the handful of tubes that I could use in my lifetime, but the market will not survive the great Boomer die-off. Yo .......

452: Tubes Asylum, "NOS" is not a spec, it is a history of the tube (0.00)
Posted by Chip647 on 2020-01-15, 05:18:14 (108.247.77.70)
New means that the tube has never been plugged into a circuit and used. Old Stock means that the tube is from any time before current manufacturer. Last year or 100 years ago. Plenty of new tubes have .......

453: Tube DIY Asylum, Lead free solder on lead free circuit boards is the worst (0.00)
Posted by Chip647 on 2020-01-08, 05:02:51 (108.247.77.70)
You can make a joint that looks good that does not work. Horrible stuff. .......

454: Tube DIY Asylum, it will be fine (0.00)
Posted by Chip647 on 2020-01-07, 17:23:34 (108.247.77.70)
If you wired up your amp in a straight line it would be 5 feet long. Another couple of inches is no big deal .......

455: Tube DIY Asylum, Buzz, hum, resistance, weak signals, RF sensitivity, compression, oscillation... (0.00)
Posted by Chip647 on 2020-01-07, 05:13:49 (108.247.77.70)
Bad solder joints can create diode effects, ground loops and add resistance in addition to intermittent or permanent shorts. The difference between good soldering and layout is the difference in sound .......

456: Tube DIY Asylum, First post in 17 years! (0.00)
Posted by Chip647 on 2020-01-06, 20:33:40 (108.247.77.70)
Why, again, would you purchase a kit assembled by a novice? Are you saying Bob built this? .......

457: Tube DIY Asylum, RE: Russian Teflon Capacitors (0.00)
Posted by Chip647 on 2020-01-02, 14:40:24 (199.82.243.84)
Use the search function .......

458: Tubes Asylum, Well, Quicksliver has them for $30 (0.00)
Posted by Chip647 on 2020-01-02, 06:05:23 (108.247.77.70)
They will last you quite a while and the amp uses one. 2 or 3 should be a lifetime supply. .......

459: Tubes Asylum, ANYTHING not made in china (nt) (0.00)
Posted by Chip647 on 2019-12-28, 12:48:52 (108.247.77.70)
.......

460: Tube DIY Asylum, Not a very good approach in my opinion (0.00)
Posted by Chip647 on 2019-12-24, 21:23:21 (108.247.77.70)
Class A Single ended amps have a very consistent current draw regardless of signal. To get "Stronger, Fuller Bass" you need the right output transformer with the right loading and enough inductance. Y .......

461: Tube DIY Asylum, You should run the heaters in series (0.00)
Posted by Chip647 on 2019-12-21, 06:19:42 (108.247.77.70)
where possible 6.3v x 3 = 19 volts for same current draw heaters No dropping resistor Put the power tubes in series and the driver tubes in parallel with each other and then place them at the end of .......

462: Tube DIY Asylum, Inductance impedes RF. No, "nano" inductance is not an issue for grid stoppers. (0.00)
Posted by Chip647 on 2019-12-20, 06:25:01 (192.189.187.122)
Ferrite beads work as well to suppress RF. "Nano" anything is not germane to building tube circuits as everything has "nano" something or other. Your question may be more accurately addressed in the T .......

463: Tube DIY Asylum, The issue is not that metal film resistors lack the resistance to be a grid stopper (0.00)
Posted by Chip647 on 2019-12-20, 05:37:15 (108.247.77.70)
Obviously they are resistors. However metal film resistors can be more prone to picking up RF than carbon comps. At that position right against the grid or plate pin, I would rather use a carbon comp .......

464: Tubes Asylum, This is the reaction of the glue used to attach the base (0.00)
Posted by Chip647 on 2019-12-19, 06:18:46 (108.247.77.70)
If they use too much it will squeeze out far enough to contact the metal trim ring. It is pretty corrosive stuff but intended to glue the glass to the plastic base. When it contacts the steel covering .......

465: Tube DIY Asylum, You can do that (0.00)
Posted by Chip647 on 2019-12-17, 08:46:26 (199.82.243.107)
You should be able to pick up a half volt. On the other side, 11.6v will probably sound just as good and make the tube last longer. .......

466: Tube DIY Asylum, You are asking about load lines (0.00)
Posted by Chip647 on 2019-12-15, 06:39:47 (108.247.77.70)
What you are asking is answered by calculating and drawing a load line. It will be dependent on how you load the tube. Read through the attached article. .......

467: SET Asylum, The glow is from the heater or filament circuit (0.00)
Posted by Chip647 on 2019-12-12, 20:29:07 (108.247.77.70)
it is not getting the 5 volts it needs to glow. Could be a bad solder joint on pins 2 and 8. At this point you need a multi-meter and the ability not to electrocute yourself. .......

468: General Asylum, Yep, get past infant mortality and teen suicide, people tend to live to between 55 and 85 years (nt) (0.00)
Posted by Chip647 on 2019-12-10, 20:11:46 (108.247.77.70)
.......

469: Tube DIY Asylum, You need to look at the third schematic (No RC Coupling) (0.00)
Posted by Chip647 on 2019-12-05, 21:01:01 (108.247.77.70)
MOSFET source follower .......

470: Tube DIY Asylum, There are only 50 failure points in that power supply (0.00)
Posted by Chip647 on 2019-12-05, 05:14:32 (108.247.77.70)
You will have to monitor each supply systematically at start-up to determine the failure point. Pull the output tubes when you do this or you will arch them with repeated failure cycles. You just migh .......

471: Tube DIY Asylum, Fully aware of big triodes with no feedback (0.00)
Posted by Chip647 on 2019-12-02, 07:12:36 (192.189.187.111)
Working on a 304TL right now. Frankly, that much complexity to drive the grid of a 845 is completely unwarranted. This is a visual/geek design rather than a straight-up audiophile approach. If you are .......

472: Tube DIY Asylum, The little local feadback around the 12AX7 stage (0.00)
Posted by Chip647 on 2019-12-02, 05:37:43 (108.247.77.70)
Is nothing sonically compared to the global feedback through the 310 that also runs through an interstage transformer. If you just unplug the global feedback, however, you will likely expose frequency .......

473: Tube DIY Asylum, Understand your point (0.00)
Posted by Chip647 on 2019-11-27, 06:06:06 (108.247.77.70)
I was too brief in context to the original post. AC filament line as he referenced .......

474: Tube DIY Asylum, "It is dangerous"? (0.00)
Posted by Chip647 on 2019-11-26, 06:11:14 (108.247.77.70)
It is dangerous to pull too much current from a power transformer, but simply dropping a volt from a 6.3v supply with a pair of resistors is not dangerous. What are you referring to? .......

475: Tube DIY Asylum, RE: 300B PP heater from 6.3v CT? (0.00)
Posted by Chip647 on 2019-11-25, 19:59:24 (108.247.77.70)
You can drop the voltage with a pair of resistors in the AC line. Make sure your power transformer does not get too hot with the extra half amp of current draw per channel. You are not going to get an .......

476: Tubes Asylum, Elma (0.00)
Posted by Chip647 on 2019-11-22, 15:33:08 (108.247.77.70)
Elma .......

477: General Asylum, He just shifted to another astral plain (0.00)
Posted by Chip647 on 2019-11-19, 16:45:10 (108.247.77.70)
That is a common failure mode .......

478: Tube DIY Asylum, RE: 45 amp cathode resistor explanation please. (0.00)
Posted by Chip647 on 2019-11-14, 05:18:20 (108.247.77.70)
So lets say the operating conditions Jack was going for was a max power using 325 v across the tube, 68 volt on the cathode for a -68 bias and 43mA current draw. (This is almost 14 watts per tube and .......

479: General Asylum, Your "Sponsoring Organizations" link for Parts Connexion is bad (0.00)
Posted by Chip647 on 2019-11-06, 17:39:01 (108.247.77.70)
The link has been replaced by a click-tracker http://clixtrac.com/goto/?47124 Click Tracker must be busted .......

480: Tube DIY Asylum, RE: Share a 27 pre-amp schematic (0.00)
Posted by Chip647 on 2019-11-04, 20:08:03 (108.247.77.70)
2 Nickel-Metal Hydride batteries in series, 1.4 volts each, for 2.8 volt cathode bias. .......

481: Tube DIY Asylum, I can draw one for you, what are you looking to do? (0.00)
Posted by Chip647 on 2019-11-01, 20:10:03 (108.247.77.70)
What are you looking to drive? Do you need gain? A simple R/C output? Output Transformer? Autoformer Output? .......

482: Tube DIY Asylum, It would appear to be a single totem-pole (SRPP) driver to the 300b (0.00)
Posted by Chip647 on 2019-11-01, 05:22:58 (108.247.77.70)
Is that driver tube a 12AX7 by chance? Have your tech adjust the resistors to use a lower gain / higher current driver like the ECC99. The worst thing is to have to throw away most of the signal with .......

483: Tube DIY Asylum, What 300b amp are you using? (nt) (0.00)
Posted by Chip647 on 2019-10-31, 19:45:10 (108.247.77.70)
.......

484: Tweakers' Asylum, Is your goal to understand driver parameters for layout and crossover building? (0.00)
Posted by Chip647 on 2019-10-30, 11:28:13 (192.189.187.111)
Or measuring the system frequency response and efficiency? When I measure system performance I will typically measure individual speakers from 6 feet out at ear level. Also measure at the listening po .......

485: Tube DIY Asylum, That would be a "Power Transformer", most likely an old school one (nt) (0.00)
Posted by Chip647 on 2019-10-30, 11:18:20 (192.189.187.111)
.......

486: Tube DIY Asylum, Your ground loop is inside your modded Amp (0.00)
Posted by Chip647 on 2019-10-28, 04:43:19 (108.247.77.70)
I use grounded power cords and interconnects with ground connections on all components and have no ground loop issues. Your ground problem will be within your amp or preamp. Phase splitter transformer .......

487: Tweakers' Asylum, RE: Hi-Fi Tuning Fuses are directional (0.00)
Posted by Chip647 on 2019-10-26, 22:09:03 (108.247.77.70)
So they have a directional diode function? This would be very bad to put in a primary supply for a transformer. .......

488: Tube DIY Asylum, Old stressed resistors can do that too (0.00)
Posted by Chip647 on 2019-10-16, 18:13:34 (108.247.77.70)
Or dying coupling caps, or broken circuit board traces. Any poor contact. Just curious, where would you stuff an interstage transformer into an ST70? You have to be aware of magnetic coupling around o .......

489: Tube DIY Asylum, "Holding the transformer's hosing stops the noise.Holding the transformer's hosing stops the noise." Bingo! (0.00)
Posted by Chip647 on 2019-10-11, 20:48:59 (108.247.77.70)
Then you have identified the problem!!! Hammond 200 series power transformers are pretty famous for this. I use the 300 series when I do Hammonds. Mount the transformer differently, use rubber isolati .......

490: Tubes Asylum, "My best guess is different operating points? " (0.00)
Posted by Chip647 on 2019-10-11, 06:14:08 (108.247.77.70)
Absolutely. 300b as a line level attenuator is kinda goofy anyway. .......

491: Tube DIY Asylum, No matter what it is, its a "Fixer Upper" (0.00)
Posted by Chip647 on 2019-10-08, 18:26:18 (108.247.77.70)
When you get it fixed up, it is time to fix it up again. Now, apparently, we have too many trees. Is that a thing? .......

492: General Asylum, RE: Oval Office (0.00)
Posted by Chip647 on 2019-10-08, 05:17:14 (108.247.77.70)
Frankly, I doubt you could hear it. .......

493: Tube DIY Asylum, You missed my point, the home is not a women's job (0.00)
Posted by Chip647 on 2019-10-08, 05:12:44 (108.247.77.70)
Rather, the concept of the "house" itself is a creation of female vanity, not men's. I spend way too much of my time and money taking care of a suburban house that I would smile at if it were hit by a .......

494: General Asylum, I would like to propose an Obituary Asylum (to be hidden like the Outside) (0.00)
Posted by Chip647 on 2019-10-07, 20:13:52 (108.247.77.70)
Most of us come here to avoid reading the Sunday Obits. Yes, people die, even those who make music. .......

495: Tube DIY Asylum, RE: 3 tube 3 watt dc coupled 6b4g practical amp design (0.00)
Posted by Chip647 on 2019-10-07, 05:44:13 (108.247.77.70)
You mean this? I would never waste my time on this design. It will sound like an old fashioned tube amp. Read up on Loften White or other DC coupled SET amps https://www.tubecad.com/2015/12/blog0335.h .......

496: High Efficiency Speaker Asylum, TAD 2001 / ElectroVoice 10" Mid / 12" Bass cab (0.00)
Posted by Chip647 on 2019-10-07, 05:24:00 (108.247.77.70)
1000hz 12db passive crossover to the TAD. 24db Electronic crossover for the bass cab. I run a 60 watt SS amp to the bass cab and anything from a 45 to a 300b to the main speakers. Very nice and as .......

497: Tubes Asylum, Then you are really missing out. (0.00)
Posted by Chip647 on 2019-10-06, 16:16:27 (108.247.77.70)
MOSFET source followers are unity gain and very transparent. It is like saying you will never use a 1N4007 despite they being indispensable in some circumstances. If you are seeking the best sound, be .......

498: Tube DIY Asylum, Houses are woman things (0.00)
Posted by Chip647 on 2019-10-06, 15:24:37 (108.247.77.70)
I would be happier with a big ass garage with a good sounding shop in the back. Society would be 1000 years advanced if we did not have to waste so much time maintaining a 3,500 square foot temple to .......

499: Inmate Central, 99.9% of all First Amendment cases are tried in the court of Public Opinion rather than the Supreme Court (0.00)
Posted by Chip647 on 2019-10-02, 04:47:50 (108.247.77.70)
So it really does not matter what the constitution actually says, it is only important how the press presents it. .......

500: Tweakers' Asylum, "electrical pulses of great velocity"!!! (0.00)
Posted by Chip647 on 2019-09-25, 05:51:27 (108.247.77.70)
It is great when you can speed up electricity. .......

Found total of 500 records, Query: , Author: Chip647 in All Forums, Time: 2 sec.

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