I swear half of you shouldn't even be allowed near vintage gear... I keep seeing people just dump half a can of DeoxIT D5 into a receiver through the faceplate gaps and expect a miracle... That isn't how contact cleaner works... All you are doing is dissolving 40 year old factory grease and letting it pool onto the PCB... You actually have to open the chassis, locate the small access hole on the pot housing, or better yet, disassemble it properly... Stop ruining perfectly fine 70s Japanese engineering because you're too lazy to pull out a screwdriver...