• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Problem: attenuation after cathodyne and CF

Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
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.
 

Attachments

  • unb to bal.jpg
    unb to bal.jpg
    41.7 KB · Views: 144
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?
 
Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.