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In Reply to: RE: Where from that hum?? posted by vinnie2 on September 11, 2016 at 14:13:25
Either I am hearing little hums in my head or the hum comes and goes as it likes. Sometimes it there and sometimes I can't seem to hear it, or at least it doesn't seem as loud. Don't send for the men in the white coats just yet, I think I may need to clean up my act so to speak. In other words get rid of all that extra wire in the form of clip leads. I may have to build one channel on a plywood chassis so I can get the lead dress right, etc, etc.
Edits: 09/13/16Follow Ups:
DC on your AC mains? I had an issue with a tube amp that did that and it was due to DC on the mains. I had .6vdc on mains. I bought a Humdinger and it took care of that hum.Sometimes the DC can vary on the mains so can cause what your hearing.
also make sure your filament wire are twisted tightly together and running against the chassis. This can reduce or eliminate hum.
Another thing is make sure you are using shielded cables from power to interconnects. When using my table I kept getting hum that would be almost gone but come back again a little louder and it was due to my braided but unshielded cables. Put shielding on them, all gone.
Sorry for not being able to help sooner. I have been finishing up the build of my Latino VTA-120 which had a filament issue that I tracked down and fixed. Now that amp is dead quiet!
Edits: 09/13/16
I will check the mains for DC, but all the others have be covered. Thanks.
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