clip on RF chokes

[papabearjew]

PBJ,  do any of the components in the system have a three wire plug?  If so, try lifting the grounds (at least as a test).

@MacGeek,  I'll double check. I remember when I was getting terrible hum through my headphone amp I used a 3 prong to 2 prong adapter on the headphone amp power plug and it solved the problem.

[MacGeek]

An isolation transformer is probably better, but lifting the third prong may help t identify the problem

[papabearjew]

Where do I get an isolation transformer?

[MacGeek]

I don't have a clue.  I cheat and just lift the grounds.  I expect someone on this Forum knows.