Tube amp buzz (amp, not speakers)

Descent sized toroidal power transformers are usually the ones that buzz, vibrate, from DC offset on the AC mains. As a rule EI transformers do not buzz, vibrate, because of DC on the mains.

I think the power transformer in the OP’s amp is a bobbin transformer. I couldn’t find any info on how they react to DC offset on the mains.

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Thank you all so much. I don't know the first thing about electronics, so it seems like I have two options: getting an Emotiva CMX-2  or taking it to a technician, at least for a comparable cost if not more. What would your inclination be?

This is another one that is known to eliminate DC offset transformer hum

https://avahifi.com/products/humdinger-dc-line-blocker

Well, after all, the AC is 60 cycles. Hmmmmm. The other troublesome thing about transformers is the rather significant magnetic field they produce.