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Trying to trace a hum in a Thorens TD124/3012/ii. Is it possible that a hum has started because of a phono preamp tube or is it always a grounding issue with the arm? One thing: if I disconnect the ground wire from the arm to the phone preamp, the hum turns into a buzz.
Edits: 11/30/16Follow Ups:
You can easily determine whether it is your phono stage by disconnecting your turntable and grounding the phono inputs. If the hum is still present, your phono stage is the culprit. If you determine the hum is caused by you phono stage, perhaps it is too near the alternating magnetic field from another components power supply transformer. Turntables and phono stages can easily pick up hum from stray magnetic fields of other components. Therefore, if grounding does not solve the problem, perhaps rearranging equipment might be the answer. Of course, it could be a bad tube, too.
Good luck,
John Elison
You called it. I did exactly what you suggested and it's a bad Tele 12ax7. Huge bummer because they are expensive to replace for matched pairs. Maybe I just go with some EH for the time being....
Thanks so much John. Your advice is always the best!
You're welcome! I'm glad you found the problem.
Best regards,
John Elison
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