I had a situation similar to yours - an early 1980's LP12 w/Vahalla which was in storage for many years and turned really slow (with even slower acceleration when I turned it on). I replaced the drive belt, no help. Finally, I brought it in to "The Analog Room" in San Jose. The owner, Brian, is very knowledgeable about Linn turntables. Bottom line, Valhalla power supplies had lots of problems. He upgraded it to the Lingo supply, which also includes a new motor. He also installed all new suspension parts (springs, grommets, etc). I also had the Trampolin kit installed. Brian recommends against the Cirkus upgrade. Anyway, it now works as good as new (maybe better). The new power supply and motor have much higher torque, better speed stability, and you also get 45 rpm to boot. It wasn't cheap, but it was worth it. Hope this helps.
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