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In Reply to: RE: Hum, dang it. posted by bcowen on May 28, 2017 at 08:36:35
The front end components are all plugged into a Chang Lightspeed conditioner, which is then plugged into a dedicated line plug box. The amps, etc, are also plugged into that dedicated line plug box.
That the tonearm cable ground wire on one phono preamp seems to do nothing is telling me something, I bet, but I don't understand what it is telling me.
Follow Ups:
When everything is properly grounded and I still have hum, I generally start removing ground connections, one at a time.
Do you have both phono stages powered up simultaneously, when you play LPs?
Unplug and unground one of the two phono stages is a good idea.
Forgive me for being thick, but just want to be sure I understand your setup. Are these 2 separate systems, or one system with both TT's, both phono stages, and both preamps all hooked up together at the same time (even if all are not powered up at the same time)?
If the latter, and seeing the ground potential isn't an issue with the Chang, you may have one component (likely a preamp or phono stage) that has a grounding scheme that isn't playing nicely with the others. If you have a cheater plug, you may try cheating the ground on one component at a time and see if the hum disappears when a particular ground is lifted. I don't at all recommend running the component with the ground cheated for the long term, just on a test basis to see if the culprit lies therein.
One system, two turntables, two phono stages, one preamp.
Thanks, I have suspected that might be the issue, and am slowly experimenting.
Check all ground connections at the table where disconnecting the ground makes no difference, starting at the cartridge.
Question: I believe you said you're using two different phono pres? Are the tt grounded to their individual pres, then both pres grounded to the preamp? If so I suggest disconnecting one of the pres grounds from the preamp, if no change try the other.
Then take two aspirin and call me in the morning.
Martin
Swapped phono stages between turntables...Klyne solid state now with Music Reference head amp...quiet as a mouse.
Klimo has some slight hum with volume at max, probably a tube.
Apparently the Klimo did not care for the Music Reference head amp or vice versa.
In any case, no hum is good hum.
Awesome.
Not so fast.
After a couple of hours of hum-freeness, it came back. I suspect a bad cap or a cap going bad, somewhere.
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