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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

Showing 3 responses by daveyf

daveyf's avatar
daveyf
3,004 posts
 
Valhalla's are getting long in the tooth, does the table hum if you place it somewhere else? If so, I would look at the Valhalla board. BTW, the Bryston phono stage is really good.
daveyf's avatar
daveyf
3,004 posts
 
@masi61 Sorry to hear of your continuing issues...this hobby can be more than frustrating at times!

Since Thomas OK set up your table ( which with the new upgrades should be stellar), I would not expect any issues with the table. OTOH, hum is usually caused by an improper grounding scheme. You should be sure that the Bryston and the tonearm phono cables are grounded through your preamp...( making sure that the connections are clean and good on the grounding wire!). If the problem persists, i would check and see if the phono stage is grounded and if the preamp is likewise.
If the hum is still an issue ( and it sounds like it might not be hum at this point), then i would be tempted to have the Bryston looked at by a Bryston rep. One other thing, if I remember correctly from the time i was listening to the Bryston, it has dip switches inside it to adjust the gain, you should make sure these are set for the value of your new cartridge!
daveyf's avatar
daveyf
3,004 posts
 
@masi61   Good, sounds like you have a handle on the hum issue. The skating issue may be caused by an incorrect anti-skating force...what tonearm are you using?
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