Inexpensive Amp with proper GND plug?

[TheManFromDenver]

I’ve tried some inexpensive amps for a workout room from Dayton and SMSI, and even a Yamaha, all with two pin plugs and no chassis grounding attachment, and they all put off incredible levels of EMF. Are there any relatively inexpensive amps that do things properly with a 3 pin grounding plug?

One of the Dayton amps has three pins at the ac adapter, but inside the gnd plug isn’t actually connected to anything.

[wogg]

What are they causing interference with?

[TheManFromDenver]

Some medical monitoring equipment attached to a wheelchair. We’re very familiar with everything in the house needing to be properly grounded. But Amps seem to be a high power exception where it’s not standard.

[devnull]

Have you tried grounding the case of the amp? A lot of them have a ground screw on the back of the case.

[wogg]

Some medical monitoring equipment attached to a wheelchair. We’re very familiar with everything in the house needing to be properly grounded. But Amps seem to be a high power exception where it’s not standard.

Gotcha. I've never had interference trouble and most consumer electronics have always been 2 prong. 3 prongs usually cause more trouble with ground loops. An old school class AB amp with a linear power supply would be clean enough, 0 high frequency bits in those.