Like most topics here, some synthesis required...
yes ALL tubes to some degree ARE microphonic. Some less so than others- certainly a classic case is the 6922 vs 6DJ8. The key is how much and what are the modes?
The various products vary of effectiveness as broad band dampers.
microphics you can’t hear can still consume power and inject noise in a wide bandwidth system and turn into artifacts you can hear.
Start with great tubes - @bdp24 gave you good advice - Roger Modjeski ( RAM ) built some great testing and grading equipment and knew how to use it. Andy at Vintage tube also knows his way around killer but let comprehensive and automated test equipment. He can be trusted :-)
Dampers can change the sound - you may not like it. You should experiment :-)
yes ALL tubes to some degree ARE microphonic. Some less so than others- certainly a classic case is the 6922 vs 6DJ8. The key is how much and what are the modes?
The various products vary of effectiveness as broad band dampers.
microphics you can’t hear can still consume power and inject noise in a wide bandwidth system and turn into artifacts you can hear.
Start with great tubes - @bdp24 gave you good advice - Roger Modjeski ( RAM ) built some great testing and grading equipment and knew how to use it. Andy at Vintage tube also knows his way around killer but let comprehensive and automated test equipment. He can be trusted :-)
Dampers can change the sound - you may not like it. You should experiment :-)