I have a ST-120 power amplifier and a SP12 + PH12 preamp. A while back I had a problem that this forum diagnosed as dirty pots. I think Bob told me to buy some anti-corrusive lubricant spray, use it to clean the pot, then twist the knob back and forth again and again. I did this, and it worked. The only problem is, I've had to do it more and more frequently until I have to clean it every four days or so. My question is, what would be a more permanent fix? Do I need to buy a new knob, a new attenuator? Both? Can I get an upgraded part that won't need cleaning as often? Any recommendations on a specific part to buy? Can I change these parts without having to solder anything? If need be I can have my friend solder for me. As you can tell, I don't know anything about electronics.
Thanks for any help you can provide,