V4 PCB component repair/updating

[Hangman]

I think it is wise to put some kind of adhesive. I use a silicone glue. You can buy some at a hardware store. It will be by the caulk. I wouldn't use hot glue. The silicone is easy to control, doesn't melt, and comes off pretty cleanly if you need to remove it.

Is it necessary to use some kind of adhesive to keep the resistor/trimmer in place on the PCB? If so, would hot glue work, or is something else recommended?

[beedoola]

I added the adjustable bias and brought the bias up to 25ma - sounds good.

I had mentioned that when adjusting the hum balance pot, I'd get a lot of loud noise throughout the pot's sweep but that the noise would stop when the pot is set at either end of the pot's sweep - fully CW or fully CCW.

My last goal with this v4 is to try and bring the hum down to as low as possible - I understand a little may be inevitable, but the lower the better.

I had read of people replacing the hum balance with resistors here

Might the HB pot be bad on my V4? Any other places to examine/address that may contribute to hum?

The hum isn't loud where it effects the playability of the amp.

[Kevin Colt]

wish I could see those pictures, the site says they were moved or deleted. I bought one of those boards from orville and its very nice.