Excessive mag field hum

[Guitarist]

My HiWatt project is really picking up hum from the guitar and I have to turn to a 90 degree angle to nix it and then it virtually disapears. It's a 3 channel amp and things get progressively worse with higher gains. Even 6 feet away. I've star grounded the guitar ages past.
Should I shield more wiring move the relays around? My single to noise ratio wouldn't be very impressive that's for sure.

I did install a huge choke as well, FYI.

Thanks, Guitarist

[Mark Black]

Perhaps - welcome to the world of single-coil pickups and sensitive input stages...?

[Guitarist]

Good guess. Though this guitar has humbuckers, splitable though: one Screamin Demon and a new guitar fetish pickup in the neck. The first input stage is base on an Ampeg with a normal stage direct into a CF. I suspect it may be the output stages (or all stages) though. The feedback loop/presence is based on a B00gie power amp stage with a Marshall PI. I swapped in a shielded wire today but that didn't do her.
I'm VERY happy with the quality tones but maybe I'll have to swap out the Partridge for a torriodial but that would be a shame, really.

[Enzo]

Has nothing to do with your grounding star or otherwise, it is the guitar pickup picking the field up. The fact that you can turn 90 degress and kill it demonstrates clearly it is the guitar, not the amp making the hum. Ain't the output stage, the relays, the feedback, or the wiring. It is the radiated field of the power tranny. Humbuckers can only buck so much hum. My shop guitar buckers pick them up all the time too. if it were any of the internal things, it wouldn't care if there was a guitar plugged into it at all, it would hum regardless.

SHield the tranny, replace the tranny, walk further away.

[Enzo]

One possible help: walk around to the side. Is it better? If so, remount the tranny turning it 90 degrees. In other words rotate the tranny so the least radiation aims out front where you will be. Then it will only hum when you sit amidst the drum kit.

Hey, it might work, only takes a second to find out.