Humming sound in SOME tube amplifiers

Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

From time to time, I find special humming sound in SOME tube amplifiers. It appears in few seconds after turning on the tube amp, and disappear few seconds later.

1. May I know the cause of this humming sound?
2. How can I eliminate it?

Thank you!

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Topic - Humming sound in SOME tube amplifiers - howardyu 23:11:02 05/29/16 (4)

RE: Humming sound in SOME tube amplifiers - rogerh113 06:21:55 06/07/16 (0)

RE: Humming sound in SOME tube amplifiers - howardyu 01:20:54 06/07/16 (0)

RE: Humming sound in SOME tube amplifiers - Michael Samra 12:25:33 05/30/16 (1)

RE: Humming sound in SOME tube amplifiers - howardyu 18:28:57 05/30/16 (0)

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