Let's Get Technical > All PREAMP Tech Tips & Support
MP1 Classic | Hum in Dist. Tube Voicing
MarshallJMP:
Can you measure voltage?If so on the upper left corner there is a testpoint,here you should have 200V,can you check it?
Griphook:
I'll check it tomorrow.
It is a US Version, since i got a Setp-Down-Transformator (220V>110V) delieverd. Maybe this can be part of the issue too?
MarshallJMP:
Does the step down have an earth connection?
Griphook:
No It's only 2 Pole, but a grounding issue would affect all Channel wouldnt it?
MarshallJMP:
Depends,sometimes this gives problems,sometimes it doesn't.
Did you measure that voltage?
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