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RE: Tube amplifier hum

The tubes are not at fault, as I have tried others with the same hum, which btw, is through the phones, not in the amp itself.
The power supply cord is not grounded in that it only has a two pronged plug.
I am pretty sure that the other amp, on which the problem amp is sitting, is acting as a ground for the problem amp, as someone mentioned.
The tube amp is the ALO Pan Am, with the non-upgraded power supply.
Not being overly mechanically inclined, although I can use a soldering iron, is there anything I can do myself to alleviate the problem, or do I need to take it to a technician?
Thanks so much for your help.

Edits: 05/20/17

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