Help with design review wanted

Hojvaelde · 23rd October 2009, 06:31 AM

Hey

I am working on a 20-35 watts amplifier. And since I have a weakness against topcaps I had to build such an amplifier.

I am planning to use a 6BG6G tube in pp with the following main points:
Raa = 6k6 with UL
B+ = 400 volt
Fixed bias.

I have compiled the following schematic,:
Is there something I have designed wrong and I am open to comments before I order the PCB.

Regards

Benny

azazello · 23rd October 2009, 06:44 AM

There is a mistake, R23 must be connected to R11 !!

Hojvaelde · 23rd October 2009, 07:07 AM

Hey

Yes big mistake. Thanks.

Benny

Tom Bavis · 23rd October 2009, 12:26 PM

Thde feedback is grounded for AC through the 40 uF capacitor - I think you intended to cross to the 1K resistor.

Hojvaelde · 23rd October 2009, 04:59 PM

Hey

Ver B included:

Hojvaelde · 23rd October 2009, 05:16 PM

Hey

Ver B included:

Benny

azazello · 23rd October 2009, 07:21 PM

Hi,
I think that positive side of this ampl. is only output power,
but I don't say the same for sound quality....I like SE and I'll prefer to use
parallel 6BG6 than PP....

Hojvaelde · 23rd October 2009, 11:07 PM

Hey

I have all the parts to the PP amplifier. I have 10 - 15 if the valve so the PSE will come later.

Benny

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23rd October 2009, 06:44 AM	#2
azazello diyAudio Member Join Date: Aug 2008 Location: Bulgaria	There is a mistake, R23 must be connected to R11 !!

23rd October 2009, 07:07 AM	#3
Hojvaelde diyAudio Member Join Date: Jan 2005 Location: Denmark	Hey Yes big mistake. Thanks. Benny

23rd October 2009, 12:26 PM	#4
Tom Bavis diyAudio Member Join Date: Jun 2002 Location: Macedon NY	Thde feedback is grounded for AC through the 40 uF capacitor - I think you intended to cross to the 1K resistor.

23rd October 2009, 04:59 PM	#5
Hojvaelde diyAudio Member Join Date: Jan 2005 Location: Denmark	Hey Ver B included:

23rd October 2009, 07:21 PM	#7
azazello diyAudio Member Join Date: Aug 2008 Location: Bulgaria	Hi, I think that positive side of this ampl. is only output power, but I don't say the same for sound quality....I like SE and I'll prefer to use parallel 6BG6 than PP....

23rd October 2009, 11:07 PM	#8
Hojvaelde diyAudio Member Join Date: Jan 2005 Location: Denmark	Hey I have all the parts to the PP amplifier. I have 10 - 15 if the valve so the PSE will come later. Benny

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