Sometimes transformers can hum. I'm not an expert but you can tighten the mounting screws and/or the plate screws if it has plate screws.
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Could be an electric phenomenon called "DC Offset" and certain MOSFET amp transformers are sensitive to it.
google it, thee are products that address it. I live in an old house and had that issue even tho I installed dedicated AC leans for my audio gear.
emotiva CMX-6 (or the 2) solved the problem for me.
What willgolf said, simple. Unplug and plug the valves back in, TOO. Same with your connections. Unplug and plug ALL the way back in.. Just 101 service.. Easy and quick. ZERO dollars, too. Move the valves left to right one at a time you’ll figure it out pretty quick.. You have a valve going under water 10 to 1. Their suppose to.
That isn't a tube. That's some sort of ground problem; apparently its affected by heat.
Does it do it on all inputs to the preamp?
Since its in the right channel only, power cords and the like are off the hook. This seems like good advice: