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Linn LP 12 hum not coming from Bryton phono stage.

I’m getting a pretty significant hum with my Linn Sondek LP12 turntable sitting on top of my equipment stand. My new Bryston MM phono stage does not hum at all when the turntable RCA interconnects are disconnected.

Yes, I have the grounding wire attached to the grounding lug on the phono preamp. I plan to move the TT to the original Sound Organization wall shelf to get it away from the adjacent electronics.

Will moving it to the wall shelf do anything to eliminate hum? What about transitioning to the better "Radikal" power supply and DC motor (the original has the Valhalla board I believe and the AC motor).

Thanks, for any suggestion you might have for things I can check.


edit: I must be tired, I noted that I mis-spelled Bryston as "Bryton". Titles cannot be edited, arghh!

masi61
lewm
13,101 posts
 
Cartridge?
masi61 OP
97 posts
 

Thanks for the replies, the cartridge is a Linn K9 MM. I did move the table to the other end of my double wide equipment stand. It definitely hums when playing music - which kind of stinks because my digital system is dead quiet. No WiFi or routers are nearby.


I will have to check and see if it hums while the RCA's are connected but the power cord is disconnected.

I will be taking it in to get an upgraded (Radikal, Akurate chassis) power supply and motor later this summer. It will be interesting to see if this eliminates the hum.


masi61 OP
97 posts
 

@daveyf  - I'm glad to hear you say that the Bryston Phono stage is really good. I don't have much to compare it to other than the one in my old NAD pre-amp. The gain on my MM only stage is a bit lower apparently than is should be because on some records I have noticed a need to turn the volume control up quite a bit higher compared with my Sony XA-5400ES SACD player or my Wadia -171i iPod dock.

lewm
13,101 posts
 
Have you noticed whether the intensity of the hum changes as you listen to an LP, from outer grooves to innermost grooves?  If not, you might do that experiment and report back.  Absent a defect in your current power supply, I doubt that the PS itself is the problem.  Or to put it another way, don't spend the money on a new PS solely in order to cure this problem.
masi61 OP
97 posts
 

@lewm  - I have noticed that occasionally the hum increases after the turntable has been running for a bit. I mean when I first turn on the turntable the hum is barely audible. By the end of the first side of music, it starts to become intrusive.

I had already planned to update the power supply for the supposed improved sonics and the ability to play 45's.

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