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Phono stage hum - Rega Aria

Hi folks, trying to solve a hum issue and would appreciate any thoughts. Rega Aria phono stage, into a PrimaLuna Dialogue tube preamp, then to Bel Canto SS mono's. 

With the tonearm NOT plugged into the phono stage, there's a hum.(especially when set to MC vs. MM)
Rega powered off, no hum while preamp at max volume. Turn the phono stage on, there's the hum...I hold the phono stage in the air, 4 feet from everything, same hum. When I hover it over my preamp, the hum gets much louder due to interference. Magnaplanar 1.7i speakers very quiet until that phono stage enters the chain.

Haven't tried a cheater plug...but have tried 2 diff interconnects (Better Cables/Silver Serpent and BJC LC1) from the phono stage to the PrimaLuna, and 2 different power cables (Furutech FP-S022N and factory cable) into a Furman Elite 15-DMi. 

Either this Rega Aria is a noisy phono stage, or I've somehow got a ground loop in there with it. It's really not bad at lower volumes, but sucks when that hum breaks the silence at louder volumes between songs/sides. 
Opinion - is this phono stage a weak link in my system? Maybe it would be fine if I find a way to eliminate that hum. 

JA Michell Gyro TT
Rega RB 808 tonearm
Ortofon Cadenza Black cart
Primaluna Dialogue Premium preamp
Rega Aria phono stage
Bel Canto M500 mono amps
Furman Elite 15-DMi power
Magnaplanar 1.7i

Better Cables/Silver Serpent interconnects
Blue Jean Cables for phono and Maggies
Furutech FP-S022N power/outlet

Cheers, thanks for any advice! 
128x128malmc02
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cleeds
5,957 posts
 
A good place to start would be to temporarily use a cheater plug to determine if you have a ground loop.
millercarbon's avatar
millercarbon
12,531 posts
 
With the tonearm NOT plugged into the phono stage, there's a hum.

And when the tone arm IS plugged into the phono stage...... ?
malmc02's avatar
malmc02 OP
30 posts
 
Tonearm plugged into the phone stage = hum. Tonearm disconnected from phono stage = hum. Cheater plug added to power cord for phono stage = hum. Cheater plug added to power cord for preamp = hum. Connected the tonearm ground wire to the ground of the phone stage. (Phono stage manual recommends that) = hum.  Grounded phono stage to ground of a few other pieces = hum. 
RCA out from the preamp feeds a powered sub. Disconnected that cable from the input on the back of the sub just now, for giggles. Accidentally touched that rca tip to a screw/ground on the back of the sub (other end is still connected to the preamp rca out) and the hum essentially stopped. LOL
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