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In Reply to: RE: Power supply ripple??? posted by FenderLover on March 20, 2017 at 20:39:26
It was connected to the right channel phono stage. Will Check it tomorrow with out the phono stage connected.
Do you think that picture on the scope would cause any noise regardless of where it is coming from?
Thanks Tom
Follow Ups:
Well, if the scope's image is not an artifact to the scope, itself --- it prolly does contribute some small percentage to background noise of your system.I'll bet when you disconnect the phono input, the hash will drop significantly. There is a lot of gain going on in that section. So, it makes it susceptible to amplifying noise, from whatever the source.
Edits: 03/20/17
Pulled first tube and if you go up under Triode Kingdom post there is a picture and some explanations. Do not know what hash is but if that is the 1-4 Hz ripple then you are right.
Would be interested on your thoughts to the new picture and findings above.
Thanks Tom
Not sure the scale this image is at. But, sure looks like random white or pink noise. Is your scope plugged into an outlet that has some appliances running on it? Like a refrigerator or A/C-heater? Maybe a computer?
Can you run same setup through an ultra-isolator or some such isolation device? To clean up any artifacts riding on top of the AC line.
Hey Fender will have to look into isolation device. Why with the power supply turned off and the probe attached could you get this type of reading. When I took the probe off the screen was flat enough. So is the noise coming up the ac cord of the scope and getting grounded to the power supply by the probe?
Thanks Tom
From the AC line. Or the scope is picking up stray external signals, perhaps.
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