In my case, the hum increased with a higher gain setting. On my phono preamp the choices are 40, 50 and 60. The MC cartridge that I have has a lower output than my MM, thus needing more gain. When I would switch the gain, the hum increased
My Impossible hum issue.
I have done everything that I have read about ground loops without success. My system is on an outlet that goes directly to the main panel with nothing else plugged into this circuit. None of the usual suspects are in this room like TV, radio, appliances or flourecent lighting. When using any other source other than the turntable, the system is dead silent. The turntable is on a wall mount turntable shelf. The speakers are on stands. This hum is only present when the turntable is the source. The hum is much louder with a MC cartridge than a MM cartridge. The hum is present when connected to an external phono preamp or the internal phono preamp of the my system preamp. I have tried every combitnation of grounding and not grounding. Whether or not I plug into the wall outlet or power conditioner/surge protector the hum persists. I beleive that I have tried everything except a different turntable. I have made sure power cables, speaker cables and interconnects don't cross each other. I've tried everything except moving to another state or hiring an exorcist.
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+1 @speedthrills @lewm these sound reasonable possibilities. In addition to tonearm wiring @russ69 . Turntables can be maddening contributors of hum. I’m dealing with an issue right now on a vintage Thorens where by it only hums in the cue up position; after the record is played. |
Do you have a digital processor? If so, that likely is the issue. It was for me. Drove me batty until I figured it out....Use a cheater plug on the power cable and that will be the end of the hum. Amazon also sells a hum manager plug but it costs $87. But it too works. You could try cheater plugs elsewhere too. |
- 35 posts total