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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
mijostyn's avatar
mijostyn
8,152 posts
 
The phono amp does not like your preamp for some reason. See if you can borrow another make or model to try. It could also be a defective phono amp but it is most definitely the phono amp. 
malmc02's avatar
malmc02 OP
30 posts
 
@smatsui with volume at max, I did hear some interference with a nearby repeater. Moved, and that went away. However, I still have the hum. 
last_lemming
629 posts
 
Maybe I missed something here, try running a ground wire from the photo stage to a ground on the preamp. Or a screw on the chassis of the pre amp
malmc02's avatar
malmc02 OP
30 posts
 
Ran ground wire between grounding posts of the pre amp and the phono stage. No change. Only thing that removes the hum is to disconnect the audio cables between the phono stage and preamp, turn off the phono stage, or ground the tip of the other end of an RCA cable that is plugged into the pre amp’s audio out. 
malmc02's avatar
malmc02 OP
30 posts
 
Update:  after listening carefully, there are two different layers of noise. White noise hiss, and a 60hz hum. When I touch the RCA from the preamp out R to a ground, the hiss vanishes from the R speaker, but the hum remains. 
Bought a new phono stage. Same exact behavior, but the hiss and hum are not as loud. I only get hiss and hum when I turn the preamp way up. Maybe this is normal, but the hiss disappearing when grounding that RCA tells me there may be a way to make it better. The hum is also annoying. 
So, this happens with 2 diff makes/models of phono stages, using power from the power conditioner and from a separate socket doesn’t change anything. Also tried a cheater plug 50’ away, on a diff circuit. No help. 
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