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Finding source of hum via O-Scope and Sig. Generator

8/23/2004 11:36 PM
BillnShell
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Finding source of hum via O-Scope and Sig. Generator
What would I be looking for as far as a signal pattern on my O-Scope to locate an annoying hum in 2 of my clones? ( I have a digital generator, so I can select sine or square wave at the input )  
 
Both amps stop humming if I pull the driver tube, so I'm guessing the source of noise is there or before.  
 
I know to probe on the AC only side of the coupling caps in each stage, but wonder where else I can test..  
 
Thanx,  
 
Bill

 
Replies:
Enzo First, hum is an extraneous signal.... -- 8/24/2004 12:06 AM