Hey SP, so as SS works, all is good in the signal chain to the outputs (patch master vol works, eq works, chorus works ?, output works) and it's something to do with the tube section. IIRC you ruled out tubes by trying a multitude of (known ?) good tubes. So this points to other things in the tube circuit (MJMP chime in anytime you like here). I assume there are trim pots in the tube section (to adjust overall gain in each tube stage) as there are in MP1 and MP2. It's worth trying cleaning the trim pots and giving them a few full up down tweaks to clean the tracks (it may be all that's wrong
and probably something we all should do from time to time as they are exposed (probably as part of a tube change and/or when we are cleaning contacts jacks etc). With some direction from MJMP, you should measure voltages around the tubes to ensure it's not power related. You may be able to pin point it by trying different voice and OD 1 & 2 settings. So the OD 1 & 2 settings in a patch change the gain in each tube (OD 1 for tube 1 and OD 2 for tube 2). So there is a thingy (MJMP will know) that accepts a number (via switching/digital input ?) that the patch is set to (eg 6.3), this controls another thingy which "actually" controls the signal gain in that tubes circuit (probably input gain
). If you pick a tube patch and scroll OD1 up and down, and then OD 2 up an down and they work/flow smoothly as expected (ie more/less gain/distortion) then I suspect an issue with the tube voicing "sub" circuits.
The voicing settings, again, use switching input from the patch to adjust various thingys in the tube circuit. From what I understand, they affect tube bias and eq (there is preset eq applied within the tube circuits to "flavour" the tone and create the "voice" (as do boogie and fender amps, but they locate their tone controls in the tube "stack", ADA voices are preset (partly to "mimic" them).
So I'm just trying to narrow in on the issue, partly by ruling various things out.