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Very early Mk 1 did have both 'pull knobs' and the first 'gain boost' could be activated by a footswitch that plugged up into the middle of the chassis. In fact all the first one did was take the gain up to 10 in one hit and by-pass the tone stack. But it did not bypass the graphic eq (if...

Has anyone had this experience or knows how to fix it please? I want to use the solo and output controls on my RK combo so I switched in the effects loops using the toggle on back. Complete loss of volume on 2 channels (each set to 2 x 6L6 only). About 25% power left in remaining 2 channels (set...

Going for the record on valves (tubes?). I have just changed the 6L6s in my Mrk 1 for the first time since 1981 - and that was when I bought it used.