Rick, the P 90 was a pickup that was invented by Satan. He thought it would be an idea to trick the guitar playing public that we could have strat sounds with a thick beefy overtone a la Les Paul, but that doesn't happen 'cause all you get is feedback and hum. When the guitarists of death metal bands die and go to hell, they can ask him what the heck he was thinking.Hi Guys,
Did Hamer ever connect a ground wire from the Bridge or Stop tail on their guitars? Should installing one help to eliminate some 60hz hum?
If what you're hearing really is 60hz hum, then embrace the hum. It's part of the charm.P-90s are gonna hum no matter what you do, unless you somehow isolate the guitar completely from outside electrical interference. The ones used by Hamer were not RWRP so the middle position isn't hum free either.