300b amps are among my favorite amps. I'd think long and hard before you let go of the Franks.
A PP or PSE amp using a big triode like the 845 or 211 might work for you but I haven't found one that has that "magic" that SE seems to do. VAC and Canary make some powerful PP 300b amps if that's the road you need to travel.
If SE is your road, then maybe a Cary 805 Anniversary Edition. I use it to drive Magnepan 3.6's occasionally. It uses a 300b to drive either the 845 or 211 output tube. This would give you about 6 db more class A power than the Franks and 10 db in class A2 for those big peaks. Most important: It sounds good to me and as I said, I love a 300b amp. Used should be within your budget. Good luck.
A PP or PSE amp using a big triode like the 845 or 211 might work for you but I haven't found one that has that "magic" that SE seems to do. VAC and Canary make some powerful PP 300b amps if that's the road you need to travel.
If SE is your road, then maybe a Cary 805 Anniversary Edition. I use it to drive Magnepan 3.6's occasionally. It uses a 300b to drive either the 845 or 211 output tube. This would give you about 6 db more class A power than the Franks and 10 db in class A2 for those big peaks. Most important: It sounds good to me and as I said, I love a 300b amp. Used should be within your budget. Good luck.