• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

ART Tube MP studio V3 problems

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Hi.
Someone who owns a recording studio just gave me an ART Tube MP studio V3 for repair.
This unit is noisy in all NEUTRAL voicing positions. In all other positions (WARM, WARM OPL, NEUTL OPL) the noise disappears.
The noise sounds like a defective filter cap to me.
Any idea what components to check on the pcb?
It a tight space in there so I don't want to poke around with a soldering gun unless necessary.
A schematic diagram would also be helpful.
 
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