Been giggin' the schniggies outta my '76 Fender P and I took it to church to play one Sunday AM and it made the most awful noise when I plugged it in. I swapped cabs and cables and I thought it got better when I switched the instrument cable but the noise was still there, just a little quieter...maybe. Now I notice it in every cab/head combo into which I plug it in. It used to be dead-silent. I pulled it apart and shielded it and it made no difference. I replaced the jack and there was no difference so I soldered the original back in. I have run out of skills to figure this out and have switched to a "plan B" bass which is nice but just not as awesome as the '76. Any idea of what might bring on a very sudden input hum (if that is the correct term)? It does not seem to be grounding or at least I can say that it does not change at all when I touch the strings. Plug it in and there is a hum. Rolling off the tone helps a little but the bass sounds muddy. Turning off the tweeter helps but the hum is still there if you listen for it. It is all original from pots to pups. I hated shielding it as it was working fine before but I was desperate to get it quieted-down. This is not "normal" as it was silent before and my other basses are also quiet. I am playing a '73 and '74 parts-bass now. I am a little reluctant (OK call it an irrational fear) to take it to a tech who will pronounce this as a "normal" P bass noise since I know it was quiet before.