60 cycle hum

I'm running a Rega P5 with outboard PSU into a Yamaha receiver with an internal phono stage. I hear no extraneous noise with the needle off the record 'til the volume control hits 12:00 - it then increases as the volume increases.

Playing records, the Exact cartridge has such a high output that I routinely listen between 9:00 and 10:00 and get plenty of volume...

Is the hum a problem or am I looking for an excuse to buy an add on phono stage?

BTW I seem to recall the same "problem" with an old HK receiver and a Denon TT with a Grado cart........but I thought it was Grado hum and when I swapped the cartridge for an Ortofon it was still there, but only at very high, not listening, volumes.

any comments would be appreciated.
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.
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.
Aceto has good idea and make sure that cables areb b not too close to each other or power supplies.Think PS Audioo make a device called humbuster but not sure how it would work with yout dry up.
Additional information: hum present in both channels (speakers). Becomes louder as tonearm approaches the spindle. Hum disappears when phono leads disconnected from receiver. Doesn't seem to vary when leads moved away from/toward power cords behind receiver.
the cartridge is picking up noise from the motor in the turntable probably. grado doesn't sheild cartridge says turntable should be, don,t know about your exact cartridge.
Are you using a VPI Power Line Conditioner to fine tune your speed? The old PLC would cause hum if placed too close to circuitry. Moving it away a few feet would solve this.
The Exact is shielded but will still pick up stray noise from transformers, etc.

Where do you have the PSU located?
PSU is located about a foot to the right of the TT. I've tried reversing its plug polarity and plugging it directly into the wall instead of the monster HTS 2000.
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.
The Exact is a fine cartridge, especially for jazz and rock - don't let anyone tell you otherwise. It's especially nice when you don't have an external phono-stage due to its unusually high output.

I was told to move my TTPSU as far as possible from my P5 TT. The power cord from the PSU to the TT is about 4 ft. long which is how far they are apart. I first had my P5 sitting atop my amp - did not work; got feed back at med. volume. Now I have it sitting on top of my proj TV. So far so good.