I just found this to be GENIUS!
How about solid-state equivalent of 6L6 and 12AX7 tubes from AMT Electronics?
Presently, AMT Electronics engineers are testing prototypes of popular 6L6 and 12AX7 tubes solid-state equivalents. Our goal is to create a reliable identically sounding analogue that doesn’t require recurring replacement and has constant parameters which remain so all the time in spite of how hard operative conditions are.
Interesting. Jet City is doing this too.