Recently I purchased a Music Hall MMF-7. Whenever I play an album at a volume anywhere above average, I get a bad low frequency rumble (much worse than a hum). It's so bad that I immediately have to lower the volume. Any ideas why?
Try placing your TT on a piece of MDF or plywood supported by racket balls. This is a cheap test. Also make sure that the bearing is is lubricated properly and if the bearing type includes a ball bearing make sure that it is installed.
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