i trash picked a boom box!!

Originally Posted by eesakiwi

If the volume is scratchy spray some CRC (WD40) into the volume potentiometer (remove the knob, spray down the shaft in the gap & keep playing with the volume control).

I have been repairing business phones for over 15 years. for scratchy volume we use Deoxit. It works and lasts for years. A bit pricy but this stuff has made us a lot of money not having to replace scratchy potentiometers.
Google "Deoxit" for more info.
Chris