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Zero effect with gain on Zero thru 10 I found the problem it was a leaky cap. Cap #69 strangely enough.

I went through and just swapp3d each tube one by one and t3sted each time. Unfortunately this did not isolate.the problem or make any difference. So it looks a bit more serious than a simple tube replacement Unfortunately. Off the top of my head I suppose both the bass and mid pots...

I just picked Up a used Roadster 100W head off Reverb. Went through the channels to check if everything worked. CHannel 4 the Bass and Mid Tone knobs do almost nothing. I mean I can barely hear any change in tone using either of them. I've tried with the treble up and down the presence...