Just because a tube pings if you tap it does not mean it will sound bad. Mild microphonics is not a problem. I’ve heard tube trials where the best sounding tubes happen to be microphonic (the tubes were 310A’s).
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.