Yes, definitely. Typically with amps, you check/replace all the old capacitors as they become leaky (electrically, and sometimes physically). Then clean and lube all the pots, and adjust the bias (so its not driving the speakers with no sound).
How old is your amp?
I did some stuff on my 80s Sansui:
Still a few things left, im not around this week but maybe electronics night in 2 weeks?