I got bad TX hum when I temporarily place my K2 on top of a 35A Astron power 
supply.  Seemed to be from the transformer's leaked magnetic field and went 
away if I lifted the K2 just an inch or two.    I'm sure I posted about it in 
the reflector, but that was pushing 20 years ago.  My call might have been 
different at the time. 

W7HV
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