@hilde45
I've read through all the suggestions here and based on the fact that your friends have subs and are looking at "mid-powered" tubes I would have them talk to Fritz and see what they can work out. He may in fact have some models that have been out for in home audition that he can work with them on.
I've read through all the suggestions here and based on the fact that your friends have subs and are looking at "mid-powered" tubes I would have them talk to Fritz and see what they can work out. He may in fact have some models that have been out for in home audition that he can work with them on.