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jhendrix
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Joined: Nov 15 2007 - 3:41pm
Hum from speakers when turntable is on

Hello,

When my amp is on and switched to my phone pre-amp, I hear a fairly loud hum from my speakers. In addition, when my fridge switches on (whatever it is that it is switching on and off), the noise seems to feedback into my speakers. Can this be solved with a power conditioner? My phono preamp is a Bellari tube preamp which I am told is noisy but I am not sure if it is the culprit in both these situations. Thank you.

judicata
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Re: Hum from speakers when turntable is on

I have the bellari as well, and I have to turn everything up really loud before I can hear noise from it.

Do you happen to have an internal phono preamp on your amp? If so, you can try to plug it in there instead of the bellari to see if that is the problem. You could just plug the TT into another input (e.g. tape), without the preamp, but you likely wouldn't get enough of a signal to hear the hum anyway.

The fridge is probably a different matter. Can you try plugging your equipment into a different circuit/outlet?

Jan Vigne
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Re: Hum from speakers when turntable is on

Where do you have your turntable grounded to? The switching noise from the fridge probably won't be solved by most line conditioners. Look for a conditioner or surge protector that lists protection against EMI. The affordable Panamax line should be a good choice. Plugging the system into another outlet might help if the current outlet is on the same circuit with the fridge. Experiment with an extension cable from another outlet to get a clue whether moving the system is worth the effort.

jhendrix
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Re: Hum from speakers when turntable is on

Thank you both.

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