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Good ideas above.
Per Mosin- gently hold the transformer down to see if it goes away. Could be loose on the chassy.
Check your cartridge connections. If one is loose, remove it and ( a la Fremer) place a tooth pick inside the connector and crimp it closed so it fits snug on the cart pin.
Good luck. Keep us posted.
Thanks folks. Definitely a buzz, not like a 60 cycle hum. Thanks all of you. Sounds more like zzzz than ummmm. When you touch/tap the pre the buzz may crackle then die only to regenerate later, sometimes in seconds, sometimes several minutes later. I have checked my cartridge connections-seems fine. My turntable just recently came back from a tuneup from George Merrill. Before I left there we listened to it through all Quad tube equipment and a Sutherland PH3D for an hour or so and it sounded great. I am technically challenged, so I ask can you touch the transformer with it playing without fear of shock? The transformer on the pre is held to the chassis by a single nut. I assume (yeah I know) it is safe to tighten while unplugged.