I've got 2 of the Hybrids (Electra VIII & FUTURA VI) and absolutely love them. Once you recap them, weed out the out of spec resistors, regrease the transistors to the heatsinks, and make sure the tubes are at least running minimally (all my 6HU8's on both are showing slightly weak but the rest are testing 80%+ on the tester) they sound GREAT! Pretty good on R&R, Classic Rock. FANTASTIC on JAZZ, CLASSICAL, MOVIE MUSICAL Sound Tracks. Not real heavy on the Bass, but everything is pretty well balanced and neutral.
Haven't heard an ALL Tube FISHER CONSOLE yet. HMMMMM! (Uncle FESTER Moment!!) Have that 69 Electra SS console, I can hook up to the 400 for a test run. The 400 is too big to fit the cabinet without MAJOR surgery, but I can attach the spkrs and TT to it with the cables and some extenders. Might be interesting.
The big problem with Hybrids is the 6HU8 tube. They run about $50. each and there aren't anymore being made, and stocks are dwindling fast. Get some while you can if you have a hybrid.
Larry