Problem: attenuation after cathodyne and CF

diegot · 6th December 2007, 11:30 PM

I built the circuit attached but I'm having four times less voltage than the input at the output of the phase splitter and the CF.
The measured DC voltages are OK and I swapped the tubes and the problem persist, so I believe the problem is the circuit.

The +B is 140V.

Thanks for any help.

SY · 7th December 2007, 12:05 AM

There are a pile of problems with that circuit. The distortion will be much worse than it needs to be. Same with balance.

As for the gain, I calculate about 0.9, so you probably have a wiring or measurement error. Are you measuring the gain just to one side or is that differential gain?

oshifis · 7th December 2007, 06:05 AM

140V B+ is too low. I'd increase it to at least 240V.

7th December 2007, 12:05 AM	#2
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	There are a pile of problems with that circuit. The distortion will be much worse than it needs to be. Same with balance. As for the gain, I calculate about 0.9, so you probably have a wiring or measurement error. Are you measuring the gain just to one side or is that differential gain? __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

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7th December 2007, 06:05 AM	#3
oshifis diyAudio Member Join Date: Mar 2004 Location: Budapest, Hungary	140V B+ is too low. I'd increase it to at least 240V.

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