u/Saturnine10

Getting this CHA-20 up and running (finally) and having one slight issue that I'm having trouble figuring out!

Ok so on the schem there is a 2w 68k resistor that ties the 6v6 screens together which leads off to the 50uf bias cap.

In my picture, there isn't one.

What effect would this have on the amp? The amp works, makes sounds etc but is fairly distorted (anything above 1/4 volume is distorted) and does this kind of weird tremolo / sputtery / note decay thing.

Amp has been fully recapped, voltages per the schem across the board are basically spot on with a variac set to 110v.

At some point in its life, one of the 6v6 sockets was replaced and I'm thinking that the amp never quite worked right after that 🤷🏻‍♂️

Anyhoo, just thought I'd ask smarter people than me their thoughts on the matter

Bogen Ch35a conversion in progress, I am wanting to drop the B+ 10-20v just to make me feel better about running this thing on modern wall voltage.

Replaced both 40uf caps with 450v ones and voltage sits around 430v but upon start up I get the surge voltage upwards of 500v. I'm aware that most caps can handle 1.10 rating (in this case this puts my 450v cap at 495v) but it makes me nervous running so close to the rated value.

Thinking a 220ohm 10w resistor placed in the red circle should work but wanted to verify with y'all that I'm not crazy.