Technic SU Z25 - maintenance
I've rescued one of these Amps with a turntable from a chicken farmer i visited. It was at the back of one of his buildings. Needless to say it's probably been dumped there a while. I've brought both home, vacuumed them both as much as possible with a reduced suction and wiped external services with a damp cloth, some areas got a paint brush dusting and q tipped. Both appear to be working but there is a little distortion/instabilty with the volume and also the bass knob doesn't change the bass level on the amp. Before i open up to dust the amp some more, i wondered if anyone had some advice on what to do next?
Many thanks in advance