Arc puts damping rings only on the smaller tubes (In my case they’re 6922’s.) for a reason. They are the most sensitive to microphonics. Having said that, all tubes are subject and it can’t hurt to try tube dampers on your other tubes.
All the best.
Tube microphonics
Hello. I am using Audio Research Ref 750 mono blocks and they in front of my speakers but off to the sides. Someone told me on another site that if I move the amps beside the speakers and not in front of them , my system will improve immensely. It will reduce tube microphonics. What are your opinions of this and I just want to say that I’m very new to tube amps so this is something I never heard of before. Thank you all.