thanks for the tips, to answer your questions.
no sound with drive or OD, noise gate is off.
loop b works fine, loop A doesn't seem to need a clean-up, rotating the mix values gives a louder or lower hum
the hum itself sounds like heater hum, but if it increases and decreases with volume, i assume it might come from somewhere else ?, so i guess the capacitors are dead in the water, they seem original, they say LEAK on them i think ? not really sure.
I will do the noise mod, just trying to figure out what's wrong with the "no sound on od less than 68" first
im used to building and repair amps, but i took this one to an electrical engineer who fixes audio equipment and he told me he can't repair the thing. so trying my luck