Recently bought a PAS 2 off the "bay" and had it gone-over. It's been functioning well - except that the phono stage is demonstrating a strange phenomenon: While listening, even at low levels, the woofers pulsate rapidly and strongly. It is only visually noticeable, but it is quite pronounced - so much so that I refrained from turning up the volume beyond 8 o'clock for fear of blowing out the woofs.
Turning off the loudness gets rid of the behavior. Line stage does not behave this way, or is hardly noticeable.
The preamp has refurbd power supply. Stock equivalents. Some newer caps for the pots. For specifics, I will consult my bill, and post some pics shortly.
Would anyone please offer some insight into my issue? If it is a simple replacement of a cap or other component, I may make an attempt to perform the fix. If it requires diagnostic equipment beyond a dvm, then I will likely be dropping it off with my go-to fixer.
Thanks for your help!