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Rega Turn Table Hum

I have a P5 and have recently noticed that once the arm/cartridge is at the last song nearing the lable, EMF hum is being introduced I believe from the motor into the cartridge. I never noticed it prior to instaling a groovetracer subplatter, but according to my local Rega dealer they have experienced it using the standard plastic subplatter supplied with the TT.
I would be very interested in hearing from any fellow Rega owners that may have a corrective action to eliminate the hum.
I recently came across (Direct Music Web) a product called ERS cloth which is suppose to block RFI (Radio Frequency Interference) and EMI (Electro-Magnetic Interference). ERS cloth is a blend of carbon fibers coated with proprietary metals that make it virtually impenetrable to RFI. It comes
in 8"x11" sheets.
If any one has any experience with the ERS cloth I would also be gratefull for your input.

Thnx
Brad
128x128bradf
10 responses Add your response
mickeyf
153 posts
 
Is it a Grado cartridge by any chance?
bradf's avatar
bradf OP
329 posts
 
SORRY I HADN'T MENTIONED THE CARTRIDGE TYPE.
I HAVE A LYRA DORIAN, AMPLIFIED BY A LEAHMAN BLACK CUBE WITH SEPERATE POWER SUPPLY. ALSO OPTED FOR THE REGA PSU.
I TRIED SWAPPING OUT POWER CORDS, WITH NO BETTER RESULTS.
ITS VERY APPARENT THAT THE CLOSER YOU GET TO THE MOTOR THE GREATER THE HUM. I HAVE CONFIGURED THE CARTRIDGE TO HOVER OVER THE LAST FEW GROOVES OF THE LAST TRAK AND IN SOME SONGS THAT ARE POSITIONED CLOSER TO THE LABLE YOU CAN HEAR THE HUM, BUT PLAYING THE SAME SONG TO THE END WITH MY EAR PRETTY CLOSE TO THE SPEAKERS, I AM NOT SURE IFI CAN HEAR ANY OF THE HUM. MAYBE WITH THE STYLUS IN MOTION IT CANCELS OUT THE HUM, BUT THATS ONLY A GUESS AT BEST. BY THE WAT IT OCCURES IN BOTH SPEAKERS

THNX
BRAD
mickeyf
153 posts
 
I've heard of the ERS cloth. You could probably start experimenting with various shields, lead sheet or even tin foil slid under the subplatter FWIW and see what happens....
also try turning the cartridge clips a little bit to adjust your contact, there may be a ground issue too. There's a lot of other things you can try including chnaging receptacles to a different circuit (start with an extension cord). TT different from the other gear.
bradf's avatar
bradf OP
329 posts
 
Thank You, I really appreciate your help
Those are some good ideas.
I wont be able to employ those ideas for another day or so, but I will let you know
Thanks again
Brad
theo's avatar
theo
2,690 posts
 
I had a similar issue when I had a P25. I found that if I took the ground from the right channel connector and grounded it to a seperate ground it helped. I ended up getting the Incognito tone arm wire which had a seperate ground wire.
learsfool
1,215 posts
 
I have a stock P5, and do not have the hum you describe. Perhaps it is the groovetracer???
mickeyf
153 posts
 
quote Theo: I found that if I took the ground from the right channel connector and grounded it to a seperate ground it helped

Could you explain in a little more detail how you did that?

Grounding the Lehmann may also help. And you might remove and reinstall the oe subplatter if the metal of the gt is amplifying the hum.
bradf's avatar
bradf OP
329 posts
 
Even though the locall dealer has encountered a similar hum using the supplied sub platter, I dont recall having this hum untill after I had replace the sub platter. I should probably reinstall the oem subplatter. Grounding the Lehmann also sounds like a good idea
I would like to thank everone who has contributed.
First chance I get, I will report back the results
Thnx again
Brad
clatch08
3 posts
 
I have a new P3 with the TT-PSU and a groovetracer sub-platter.

I was having nasty woofer rumble, not hum, but the problem could be related. It turns out that the TT-PSU was too close to the table. I have the table mounted on a wall mount, with my stereo stand decoupled below it. However, there was a large enough gap between the top of the stereo stand and the bottom of the wall mount to place the TT-PSU. Once I moved the TT-PSU as far away as possible, the rumble went away. You might want to give it a try.
bradf's avatar
bradf OP
329 posts
 
Clatch08
Thnx, I have some flexibility in my rack(s), so I think I will try to sperate the TT,TT PSU, Lehmann, and Lehmann PSU
as far from each other as I can get them. But bear in mind that the hum I am experencing is not noticable untill the stylus gets really close to the lable and stops all together when you move the cartridge about 1/2" away from the lable.
Thanks for your help
Brad
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