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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

Showing 2 responses by tablejockey

tablejockey
3,800 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!
tablejockey
3,800 posts
 
Lostbears, when it was on the market I believe it's mentioned power supply enhancements for even quieter performance along with replacing the blue LED's under the tubes to a shade that blends with the glow of the tubes.
Never was a fan of the blue LED, reminds me of cheesy made in China gear. I've been tempted to unplug the blue front display.
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