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#251 |
Spreading triode love.
diyAudio Member
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Yes, I do. I'll PM you.
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If you can't learn to do something well, learn how to enjoy doing it poorly. |
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#252 |
Spreading triode love.
diyAudio Member
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This is my solution to that. This is the PSU for the amp schematic I posted above.
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If you can't learn to do something well, learn how to enjoy doing it poorly. |
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#253 | |
diyAudio Member
Join Date: Apr 2013
Location: near Toronto
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This copied from RCA Receiving Tube Manual RC16 published in 1950. Not much is new in audio under the Sun or anywhere else. Bootstrapping avoids the HV PS. ![]() |
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#254 | |
diyAudio Member
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Quote:
For an amp that big, it makes sense to have a separate plate supply transformer for the output tubes. The driver stages don't need that much of a transformer for their plate supplies. I did it that way once, to get a 440V B+ to a driver stage for a pair of 300Bs with 360V B+. I think the separate power transformers helped the sound quality (but I can't be sure of that). -- Last edited by rongon; 24th November 2020 at 04:02 PM. |
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#255 |
Spreading triode love.
diyAudio Member
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They raise the Zout, but the grid leak for the following stage is 330k so it doesn't matter, and there's plenty of gain already
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If you can't learn to do something well, learn how to enjoy doing it poorly. Last edited by kodabmx; 24th November 2020 at 04:30 PM. |
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#256 | |
diyAudio Member
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Quote:
If using triode output tubes like 2A3 or triode-wired EL34 in Class A, I find the sensitivity is a bit too high, like only 200mV to full power, when I'd prefer something like 1V to full power. Reducing the gain at the diff driver stage could work nicely for that. Also, I've noticed that the diff driver stage is where the highest signal levels are, and consequently where distortion levels are highest. Reducing the distortion there should make a pretty big difference in the distortion performance of the whole amp. Nice trick, I'm gonna steal it from you! ![]() |
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Thread | Thread Starter | Forum | Replies | Last Post |
Difference between SE output transformer and push-pull output transformers | hilbert_mostert | Tubes / Valves | 12 | 8th March 2009 06:10 PM |
Push-pull output impedance | SpreadSpectrum | Tubes / Valves | 6 | 7th March 2008 12:38 AM |
Output transformer push pull | om kalsoum | Tubes / Valves | 7 | 7th May 2007 10:48 PM |
modify parallel push-pull EL84 to single push-pull | chungtat | Tubes / Valves | 12 | 4th November 2005 12:25 AM |
Push Pull Output Stage Question | 316a | Tubes / Valves | 4 | 10th February 2003 02:04 AM |
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