We have a custom built equipment stand an I don’t want to replace it just yet.Cabinets and wives are common impediments to better sound. I understand why we put up with one, but divorce takes care of the other.
Anyway, at 4Ohms nominal impedance, which means it likely dips below that at certain frequencies, and sensitivity of 87.5dB these speakers don’t exactly cry out for tubes — at least not to me. Just because a tube amp “can” drive a speaker doesn’t necessarily mean it should. At the very least you’re likely to push the Octave amp hard unless you only listen at low levels, and that’s not an optimal situation for any amp. There’s a reason Andy Payor favors amps like Gryphon to pair with and voice his speakers. If it was me I’d look for the best Class A (or A/B) amp that has sufficient power and sounds good to you (and fits in your beloved cabinet) and pair it with a good tube preamp. But then again, if the Octaves are really working for you, what the hell do I know? Best of luck in making your decision, and congrats on the great new speakers!