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In Reply to: RE: If the sine wave isn't pretty??? posted by TomWh on March 14, 2017 at 11:29:41
You remembered my old signature moniker eh? Anyway,your waveform simply looks like an audio signal whether it be music or voice going thru the preamp.You need to tell us more about your hum,like is it in both channels and when did it start.. Nice scope BTW.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Follow Ups:
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
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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