Power Transformer on Blues Junior making ringing noise?

[EVMode]

We shouldn't assume things. Is your reverb tank in a bag? It should be.

Yep it is in the stock DRRI configuration (bag, cabinet mounting, cabinet design). For anyone willing/interested in helping here is the thread I created of my issue.

https://ampgarage.com/forum/viewtopic.php?f=8&t=33707