Ok, maybe one of you electronic gurus can answer this question. I have a single, single hum guitar that had no issues before. Then one day I notice a real loud hum coming from the neck single coil. I bring it to my guitar tech guru, he goes over for days, can't find anything wrong with the wiring, no loose wires, not the jack, the pots are perfect. He cleans the electronics, and he is just as puzzled as I. He can only think the single coil has something loose in it, but since its a vintage peice he doesn't want to touch it. Ok, so the most puzzling part, is that when I plug the guitar into all my amps, once I switch to the neck single coil, HUM except my KOCH multitone. NO hum, silent. Plays perfectly. Ok, now I'm really confused. Unless the coil magnetic waves are being cancelled out by the KOCH, I do not know what the heck is going on. So other than restricting this guitar to the KOCH or taking out the single coil and sending it to a pickup expert to go over, anyone have any insights? thanks!