And another thing... hum

[ErikH]

Are you near a computer monitor to two? Those definitely will contribute. Turn it/them off and see what happens.

[solspirit]

After changing the pickups on my new Epi Les Paul Standard to SD Whole Lotta Humbuckers, I'm getting a low hum. Not deafening by any means, but annoying none the less. Touch the strings and it goes away. I haven't tried the amp sans pedal board, which is an idea, and the amp is an Origin50, so it's a bit noisy anyway ("that's called "character", sir" being my explanation - it's been like that from new and I just take it to be what tube amps do).

I've put a multimeter across from the back of a pot to the bridge, and I've got a circuit there, so the bridge is grounded for sure. I've also nuked the ground soldering to the pots with my Weller "ray gun" soldering iron, so they're good.

I noticed there are two "mystery" wires left buried inside the Epi somewhere, one red, one green, and I don't know what they're for. I suppose I could go ahead and ground those, but any other ideas?

If touching the strings or bridge changes it, it's definitely a ground issue.

[solspirit]

It's the amp :-(

Or bad positioning.

That just means that the problem is still there to some degree.

[ThreeChordWonder]

It's wierd.

With nothing at all plugged into the amp, the amp is silent.

I'm homing in on a bad cable or something.

[ThreeChordWonder]

Turned out to be the distortion and blues driver pedals combined with overly long cords between the pedal board and the amp picking up hum from somewhere.