I think the term was Microphonic. Someone thumped a piece of tube gear and acted surprised when it made noise.
Dared SL2000A with the reviewed by H9 Brimar rectifier and Telefunken tubes.
I am the only person local to play with tubes so a basic understanding of the terms would be a good thing.
What are the terms? Do tubes just up and echo from time to time?
(if you read this H9 could you give the explanation of the Tripple Darlington Outputs in the GFA-585? please) Not cheap but an awesome amp