Or, should i have said TRY and fix it. lol. I recently acquired a Tascam M-30 mixer, 34b reel to reel, and Rs-20 spring reverb unit, for a storage space. I got the whole setup for $100 and bought it in the spot, after checking to see if they fired up. I was glad to see what the setup was going for on flea bay when i got home, in case i don't end up using it much. After cleaning the 2" of dust off of the mixer, i a mic/cd player into each channel to confirm that they work. they do. The problem was a staticky sound on all the knobs. so i broke out my contact cleaner and just worked the knobs back and forth until the dust from underneath them came out, and they were silent. This worked on about 3/4 of the mixers knobs, leaving some of them a bit noisey towards the extreme rotations. QUESTION: Is it s huge undertaking/take a high level of expertise/worth it, to get these pots cleaned, and quiet. I've done a few system 'rewires' and built a couple studios professionally. However i haven't dabbled yet into finer electronics work. If i had to replace the pots i will learn soldering. From what i can dechipher i would have to slide the knobs off the pots, and unscrew the screws holding the mixer top on. Thanks!