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Found em - thanks. Yes they check out. Since the hum is affected by the volume control, I'm thinking it is being introduced in the preamp I am starting to suspect it may be from one of the 4 high voltage capacitors. They are 20 years old - maybe some AC ripple getting through? I have found some...

Yup - had tried that - doesn't make any difference.

The jack checks out - the shorting tab is working as it should when the 1/4 inch not plugged in. Couldn't find which resistors you meant - got the 3 caps stacked beside each other on the board but when you say "in front" do you mean on the board? There are 2 1 watt (I think - about a 1/4 inch...

Thanks, I'll check that out and report back. The hum doesn't vary - it is becomes audible with the master and the reverb pots at about halfways each and gets to where you could hear it across the room with both pots turned up. The amp sounds good when played through - I don't have the...

I hadn't paid much attention to the hum I was getting until a seasoned player told me it should not be making that noise - the amp should be dead quiet when sitting there and not playing. Got a Mark lll red stripe head and 1 x 12 cab. Went through the manual and did all the tube switching to no...