Back to the VT-71H

[bandersen]

Originally Posted by Chris K

Thank you so much...yes I will try that. At the least, it will give me a reference as to what can be ruled out. Also, it will be so wonderful to see an actual picture on this!!! A few questions...what value capacitor...should the ground for the composite input be to the chassis or B- and, I have the variac set to 117 volts plugged into the isolation transformer so the setup is IT-Variac-Television. Is that OK? I know it makes sense to me but I trip over so much stuff in this hobby.

Ground for the composite source connects directly to B-. Anything 0.01 and up for the connection between the composite signal and tube grid as Yamamaya42 said.

So what I'm thinking is that the 6AU6 plate is being shorted to something and the screen is acting as the plate to get a signal for the audio. What voltage do you have on the plate and screen (pins 5 and 6)? How about the 6.8K, 4.7K resistors and 20uF cap?

Good luck!