[receiver hums / drops high frequencies until tapping vol knob]

Does this mean that the pot is not likely to be failing, but I'm chasing
down a weak/lose/cold solder point??

Thanks for all who have helped! Forgive me for the new thread----I felt
that it would be worth others learning about.

--
"So I just, uh... I just cut them up like regular chickens?"
"Sure, just cut them up like regular chickens."