thanks for that and the pic of your chassis (which is beautifully done, I might add). If I may, here is a general question. Do all the ground points in the amp ultimately connect to the ground on the plug? Ive been reading some stuff about being careful about how you ground the various circuits (e.g. the DC stuff should be grounded separately from the AC stuff), but doesn’t everything end up going out the ground plug into the wall?

Apparently it’s very important to ground the heater circuit correctly (hi current). I assume the heater “center-tap” (“return”?) ends up going out the ground plug?