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In Reply to: RE: Granite audio ground zero posted by JKT on August 29, 2016 at 11:25:09
I found the paint under the grounding post, cleaned that.
I found the power cord feeding the power condition was wired backward,
ie hot and neutral reversed, fixed that...
still the same buzz.
I think upon close comparison, the left channel is buzzing a bit more than the right, so I swapped tubes...still the same.
It buzzes less in integrated mode.
Follow Ups:
Do you have a scope? A DMM? If you do, see if you can trace back from the output and find where the noise enters the signal path. Also check to see if you have excessive ripple on the PS rails. If that is the case you could have a defective PS filter cap. An in circuit cap ESR meter works well for testing these. Good luck, these issues can be very frustrating. I know!
"It is better to remain silent and thought a fool, then speak and remove all doubt." A. Lincoln
Thanks for the tips JKT, I don't have a scope, but maybe I can borrow or buy a used one. It's frustrating to find what you think must be the problem and it turns out not to be...
or maybe I'll have to bite the bullet and send it somewhere for repair.
Shipping kills
You might try posting this issue you are having on the DIY tubes forum here. Lots of inmates have more experience trouble shooting than I do.
"It is better to remain silent and thought a fool, then speak and remove all doubt." A. Lincoln
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