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Old 25th July 2013, 06:42 PM   #1
TURING is offline TURING  China
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Default CV2799 (Mullard) QQV04-20 parallel single-ended audio amplifier

The audio amplifier made ​​in April this year, was originally used "beijing" FU-32 done in parallel single-ended, and later a British seller in EBAY where to sell me four CV2799, ordered to transform it into the form of the following figure.




Do not be confused by beautiful photos, I'm not doing commercials, photographs of tube amps is unique in the world, are TURING own diy out. Beautiful photos, the reason is Turing is also an avid photographer.



Here I have repeatedly been misinterpreted as doing commercials. Very aggrieved.
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Last edited by TURING; 25th July 2013 at 06:59 PM. Reason: Do not be confused by beautiful photos, I'm not doing commercials, photographs of tube amps is unique in the world.
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Old 25th July 2013, 06:46 PM   #2
TURING is offline TURING  China
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Have to say CV2799 is a very nice tubes, British workmanship, praise one here first.
Nightscape, CV2799 has a charming light.
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Old 25th July 2013, 06:49 PM   #3
TURING is offline TURING  China
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Compare CV2799 and its sibling "Beijing" FU-32
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Old 26th July 2013, 12:09 AM   #4
farhun is offline farhun  United States
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Interesting tube, and very good job, congratulations! Will you post the schematics of your amplifier too?
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Old 26th July 2013, 10:49 AM   #5
TURING is offline TURING  China
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Click the image to open in full size.
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Old 26th July 2013, 03:22 PM   #6
farhun is offline farhun  United States
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Thanks, TURING. Are you satisfied with the results?
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Old 26th July 2013, 04:08 PM   #7
TURING is offline TURING  China
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This tube amp has amazing tone. I think beyond my DIY ever 2A3 single-ended amplifier. FU32 \ QQV04-20 has amazing overload. And good curve.
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Old 26th July 2013, 09:27 PM   #8
farhun is offline farhun  United States
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TURING, is the OPT you used, with 3.5K primary really optimum, or have you tried any other transformer?
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Old 27th July 2013, 12:13 AM   #9
Matt BH is offline Matt BH  United Kingdom
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Not too sure about optimum load for these nice little guys, but I have tried them in push pull and PSE. They are NOT well matched within the envelope and one of them will run way hotter than the other.

Perhaps thats what you perceive as good tone Turing? Individual fixed bias is the way to go.

Cheers
Matt.

Last edited by Matt BH; 27th July 2013 at 12:15 AM.
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Old 27th July 2013, 09:44 AM   #10
TURING is offline TURING  China
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Quote:
Originally Posted by Matt.B.H. View Post
Not too sure about optimum load for these nice little guys, but I have tried them in push pull and PSE. They are NOT well matched within the envelope and one of them will run way hotter than the other.

Perhaps thats what you perceive as good tone Turing? Individual fixed bias is the way to go.

Cheers
Matt.
If class B push-pull output, a fixed bias is very important. Class A, AB class, totally unnecessary. Take a look at CV2799 parameter maps, the curve is very good, almost no pentode with the match. Sense of hearing is very good, simple circuit, we recommend that you try.
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