I thought that I had gotten over my own tube amp G.A.S., but after reading this thread......
My favorite is the vb2 right now.
Do the Sunn's have an active tone control, or or passive/cut only like fender?
Were Sunn's the ones that used Dynaco hi-fi transformers?
Early Sunn's (like my '70 200S) were based on the "Dynaco Mark II 60 watt tube kit"... I don't know if the tone stack is active (boost), but there is plenty of control in it!
-robert
