it probably has something to do with the cheap amplifiers you are running it through, i've never heard of a problem such as this.
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Cheap aint nutin to do wit notin where hum is concerned. Anyway Yamaha aint cheap, its mid-fi. And I never heard them do that. But 60 cycle is a cooky animus. You could try breaking it all down and re-connecting. I do not know Rega by experience, only reputation, which is relatively very good; does it have a ground wire? Try a cheater plug to break a ground loop (if there is one). First the receiver to the wall, then the table.
I had to get 8 foot grounding rods from Radio Shack to fix mine. And if it does not rain in two months, even that does not work.
Failing that, borrow somebody's receiver. If that works it is probably too expensive to repair your Yamaha. Get a Rotel if you need the tuner, else a Creek, or even an Onkyo.
High output cartrdiges like the Exact are going to have some "noise" associated with them when you crank the volume on your amp up.
I'm a bit perplexed by the responses from Aceto and Readster. Your analog input is never going to be as quiet as, say, your CD input. It's not a problem though unless it's above the noise floor of your cartridge when playing.
Sorry for the delay, been away for a few days.
If it's below the noise floor of the turntable and only audible when the volume pot is pushed past 12:00 - honestly, I wouldn't worry about it. I can't say 100% without hearing it in person - but it sounds like normal noise levels for your setup.
The number of coil windings in those high output cartridges are going to pick up some stray noise. Every Goldring (6mv) or Rega (7mv) cartridge I've ever run has had it.
You can drive yourself nuts tinkering with all the nuances of analog - your best bet is to just sit back and enjoy it as long as nothing is glaringly wrong.
Thanks, Vinyladct..........it is well below any level I could stand. If I get it too loud my parrot screams - he wants me to save my hearing. (and his)
The reason I bought the Rega in the first place is set it and forget it operation.
I can even tell in the next room if it's a cd or an lp playing.................and those .50 and dollar finds!
Thanks everyone for input and help.