V4B - Dual Bias Control - External Set Up

[Hangman]

I'd say install the 1 ohm resistors on the cathodes of each tube, and use the multimeter to see how the tubes look. that should give you a pretty clear idea of whats going on, you can always add the bias monitor ports after that if you think that it needs it.

yes, R49 which is a 75K resistor. Sorry about that, looked at the schematic, read the wrong value.

2 100ohm resistors are fine for replacing the hum balance pot.

My interest really isn't increasing bias, I just want to know that it is in a good range and I want to be able to do so without opening the amp... plus its a fun project.

It has been too mushy for awhile in my opinion. Perhaps I should wait until I have the rest of the issue figured out and then assess whether I should install a bias control.

Clarification: You said R75, I don't believe there is one. Did you mean the 75k resistor I wanted to put in?


Also, I took out the hum pot and was going to tie 100 ohm resistors from each heater to ground. I read this was a good alternative.
That sound ok?


thanks,