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In Reply to: RE: If the sine wave isn't pretty??? posted by Michael Samra on March 14, 2017 at 17:37:19
Well it is from the tubes,transformers, interstages, ac lines etc. That is just the right channel on the phono amp turned on. It is a great sounding phono amp but it has a lot of iron. So the hum is there not enough to freak out but I thought I might use scope as a detective tool.
I have gone after hum before by all the normal means but I thought it would be fun to play with the scope to see if the finger gets pointed to certain area.
So if you have a certain procedure you would use I am all ears. The MV tells us we have unwanted ac but the picture is confusing at best. It is common to both channels.
Thanks Tom
Follow Ups:
Tom
If the hum wasn't always there,and this unit has one power supply per channel,it is probably a filter cap.It can also be a bad ground on the input or chassis.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
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