@_rossbower The guitar industry is really what drives pentode power tube production. It does not want anything other than KT88s because there are so many vintage Marshalls around and guitar players on the road want to be able to find a tube if one fails.
So there are some very good KT88s available now. JJ makes a blue glass (mentioned earlier) which is really quite good. I think you'll find in an amp designed for KT88s, that even though they make a bit less power, KT88s sound better.
So there are some very good KT88s available now. JJ makes a blue glass (mentioned earlier) which is really quite good. I think you'll find in an amp designed for KT88s, that even though they make a bit less power, KT88s sound better.