No... while I could agree with you that your speakers could use more power and perhaps solid-state control in the bass, you'll lose that nice EL34 midrange that the PrimaLuna offers.
Here's an idea... Bi-amp: Use the Prima Luna amps on the midrange and highs and get a powerful solid-state amp to use on the bass section. That way you get more power and keep the nice midrange and highs. Either that or keep the PL preamp and get a very good solid-state amp to drive the speakers full range. If that works to your satisfaction you could then sell the PL Six amps.
Here's an idea... Bi-amp: Use the Prima Luna amps on the midrange and highs and get a powerful solid-state amp to use on the bass section. That way you get more power and keep the nice midrange and highs. Either that or keep the PL preamp and get a very good solid-state amp to drive the speakers full range. If that works to your satisfaction you could then sell the PL Six amps.