What would be the causes of 60 cycle hum through a tube?

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It's definately the tube; it follows the tube from one channel to the other when I swap them. It's a 12au7.
I'm curious as to what the various causes might be.
Thanks!

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Topic - What would be the causes of 60 cycle hum through a tube? - PureAudio 18:20:39 03/17/07 (1)

Re: What would be the causes of 60 cycle hum through a tube? - Tom Bavis 19:07:46 03/17/07 (0)

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