I tend to agree with Edle. I think you need to keep the amp / passive preamp (etc) and consider different speakers.
SETs vs. Push/Pull
Say, people! I've been a tube guy for about 22 years and an SET guy for 7. Am seriously thinking of selling my Air Tight 300B and getting a P/P with more power. Anyone done this and if so, how are things going? Any suggestions for replacement amps that can compete musically with SETs?