I'm not entirely satisfied with the 6L6GC tubes in the Leben (using Winged Cs now; good balance but sounds recessed) or the EL34s (again, Winged Cs: way too forward, especially in treble & mids, too mid-range-y & typically "tube-y" & extroverted in sound)
I've been asking around and I've been told that KT77s might fill the gap nicely between the 6L6GC & EL34 sound. I was going to get a quad of JJ KT77s, which seem to get raves from their users, but I received one word of caution from a very knowledgeable tube guy, that JJ KT77s have build quality problems & reliability issues. Is this true? Has anyone here used JJ KT77s?
Other tubes I might try are 6CA7 EH. Any comments/suggestions will be appreciated, as usual.