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The static while turning the volume control is probably due to a dirty control. Spray the volume control, as well as the other controls and switches, with a good control cleaner. If there are still problems after this, suspect bad electrolytic caps in the amp. Even though it's solid state, it's getting to the age where caps start failing.
Last year, I fixed a '70 RCA console stereo by replacing all the electrolytic caps. The guy that owned it had already taken it to several shops. They either turned it down at the door or kept it for months only to tell the owner that it couldn't be fixed. It's hard to find repair shops that will service old equipment. They either don't know how to work on it or they feel the repair would be too labor intensive for what they'd get out of it.
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