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MP1 Classic | Hum in Dist. Tube Voicing

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Griphook:
hello guys,

I recently bought a MP1-Classic  :whoohoo!:
The brown-Channel is very nice :) :)

And how could it be otherwise, I got a new problem.
There is a hum, when im in Distortion Voicing. It is not dependant on the OD1/OD2. I also plugged of any other gear, switched the Loop off/on, tried all Ooutputs, but no change of the hum.

Any Ideas? :)
Thanks in advance

MarshallJMP:
So if you set both OD's on 0 you still have a hum?What happends if you turn down the master volume and the front vol pot?
Just want to figure out where in the circuit the hum is.

BTW try this with nothing plugged into the input.

Griphook:
Hi MJMP,

tried what you said and heres my result:

I tried the following two times, first with Guitar plugged in, second without:

Turned the following to zero
OD1 --> no change
OD2 --> no change
Master and the Poti on the front --> Hum goes away as more as i turn it down

Both times same results. So the issue is somewhere behind the tube stage?

MarshallJMP:
do you also have this on the brown voicing?

Griphook:
Nope, no Hum on the brown voicing

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