ZYGI
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Setamp,
It could be as simple as something running on the same leg as your outlet. Lets say a refrigerator, and it hadn't been running other times you listened. Then today, it shut off while listening and away went the hum.
This is a good reason for a power conditioner if you don't have one.
I had a dimmer, in my listening room that even though the lights were on separate circuit breakers from the outlets that supplied power to the amps and the like, they both were on the same leg in the breaker box. I quick switch of one of the breakers up one place, took care of it. And this was with power conditioning.
And a tube could be it as well....
Hope you find the problem.
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