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Super Noisy Phono Pre--Help?

I have a Fosgate Signature Pre. I feed it with a Lyra MC cartridge mounted on an SME V arm. Until last week, all was bliss. Then the preamp started producing a random popping sound and a motor sound like there was poor electric motor plugged into the same outlet. I thought it was a tube, but swapping out tubes didn't change it. I took it to my local service department. They cleaned and resoldered some of the connections. Now the popping sound is gone, but the constant motor sound persists. The motor sound goes away if I disconnect my turntable. I can influence the sound by moving my interconnects around. I cannot change it by relocating my preamp. It seems like it might be some sort of interference, but I can't understand why it has shown up all the sudden after a couple of years of perfect sound. Suggestions, please. Could there be something wrong with my interconnects or my cartridge?
jmmorford
tablejockey
3,936 posts
 
I have the V.2 version, and it's very quiet. If you've done the obvious things like simply disconnecting/connecting connections and swapping, maybe time to call the distributor(Musical Surroundings)for an R/A. Their quite reasonable and if it's within the 2 year warranty period,
they should even provide the UPS shipping label to send back to them.
I had a futzy right channel that I was able to isolate to an inferior solder job to the output jack. A quick touch up, no problems.

Have you compared the Foz to others in the price point? I'm curious if the Manley Chinook exceeds rip its performance. I may demo one just to hear the differences. Mine is tubed with NOS,and plumbed with Nordost Heimdall 2 power/interconnects into a VPI Classic. No complaints here!
zd542
5,339 posts
 
Trying different cables would seem to be the next logical step. What are you using now?
lostbears's avatar
lostbears
538 posts
 

Have you tried plugging it into another outlet? Maybe with an extension cord from another room. I also have a Fosgate V1 and it is very quite.

I had an intermittent hum in my tube preamp. I could not figure out what it was. It would come and go sometime after hours of listening. It turn out that it was the light in the dining room. We had replace the bulb with a compact florescent. Every time the light was on there was a hum in my preamp. Since the dining room is not visible from the room my stereo is in it took me a while to figure it out. We have now gotten rid of all the compact florescence in the house.

Does anyone know what the actual differences are between the Fosgate V1 and V2?
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