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In Reply to: RE: Tube amplifier hum posted by lesleymorley@yahoo.com on May 19, 2017 at 13:23:19
I had a similar issue and a repair technician in Hong Kong told me to buy two cheap ($1 cheap) plug adapters.So you buy a US to Asia/Euro Adapter - plug your amp into this adapter. Then plug that into a Asia/Euro to US adapter. Then plug it into the power bar/wall - this grounds the connection and he said in the vast majority of cases the hum will disappear. But do not use 3 prong to 2 prong plugs.
I have to say - it worked like a charm. Also - having your source component and your tube amp on the same power line bar or wall socket may also work. This latter suggestion I would try first as I am not sure about the safety of the first method - it works but is it strictly speaking safe? I don't see any Hong Kong apartments going up in flames and I don't see why it would be unsafe but I am not an engineer.
Edits: 05/20/17Follow Ups: