Well, the cooler temperatures of October / November brought back the curse of the transformer growl!!!
I picked up the Humdinger DC Line Blocker (
https://avahifi.com/products/humdinger-dc-line-blocker)
Buzzing diminished by a significant margin. I used to easily hear the buzzing from my desk (approximately 48" away from the amp) and now can only detect the sound when my ear is next to the amp (within inches). Pretty amazing solution for $140. (I am not affiliated with this product).
All that said, I've been saving for a power conditioner that specifically blocks DC. Here's what I'm thinking - IsoTek Evo 3 Nova.
(
https://www.isoteksystems.com/product/select/evo3-nova/)
Anyone have experience with this product? I'd love to hear your thoughts..
Thanks!Ken