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...