How to clean up Guitar hum

[aldentinnin]

is the hum the same in every pickup combination/position?

[filter_7]

yes, the hum is the same in every pickup position.
can this tell something?

[Tone Deft]

it's your computer monitor or some other device radiating large amounts of noise. try standing with your guitar and turning in a circle. if the noise goes away stop, you're probably standing with the offending device to your direct left or right (you're standing parallel to the EMI wave.)

with 3 position single coils you get a humbucking effect when two of the coils are on at once.

[miyarakira]

I read the description of Tubeman Mk II, and from what I could see,
it doesn't have ground lift.

Connecting a computer/laptop/audio interface to another audio equipment can
cause a background hum due to a "ground loop". This can be related to the
electrical wiring of your house, venue, etc. A suitable DI box should effectively
interrupt the ground line, thereby eliminating the hum.

Might be worth a try. If the DI box comes after the Tubeman, I think you
would need a "passive" DI box.

Have you tried posting the question on gearslutz?

There are some knowledgeable people there, esp. on technical/electrical aspects
of music production.

[Tone Deft]

I read the description of Tubeman Mk II, and from what I could see,
it doesn't have ground lift.

Connecting a computer/laptop/audio interface to another audio equipment can
cause a background hum due to a "ground loop". This can be related to the
electrical wiring of your house, venue, etc. A suitable DI box should effectively
interrupt the ground line, thereby eliminating the hum.

Might be worth a try. If the DI box comes after the Tubeman, I think you
would need a "passive" DI box.

Have you tried posting the question on gearslutz?

There are some knowledgeable people there, esp. on technical/electrical aspects
of music production.

or just try to plug all your gear into sockets that sit on the same circuit breaker. then there's no ground loop to break.

[simmerdown]

or just plug direct from your guitar to the mic in...Live can make it sound great internally and post-rec

[Muzik 4 Machines]

or just plug direct from your guitar to the mic in...Live can make it sound great internally and post-rec

NO

a guitar needs a Hi-Z input for the pickups to give their full tonal potential, a guitar in a line or mic in is dull and lifeless

[filter_7]

Now with some experiments i found that the Tubeman can cause hum on channel 2 and 3 (the overdrive channels), so i can say it's pretty obvious if distortion=hum.
On channel 1 things are quiet.

I think i don't have big wiring issues, 'cause with different <tubeman /eq /effects (in Live)> settings i can control the hum to clean levels.

Now i think it's a question of presets and fx settings (!).

@miyarakira: thanks for the link

Thanks for your help guys!