Lincnabby, I'm almost as puzzled by this as you are. A good friend designed and built my SET amps (845 output tube, EL34/KT77 driver tube, 6N7/ECC31 input tube, solid state rectification) and swears the output is 12 wpc. They sound very powerful, though, probably due largely to the huge transformers he used (no, he's no longer building them). I have a pretty large room, 18 x 40' with an "L" off one of the 40' sides. And as far as I know I've never clipped the amps. BTW, they replaced Conrad Johnson Premier 12s (140 wpc) because they sound much more open, dynamic and detailed than the CJs did.
As to whether your Fisher would handle the Gallos, I think so, but I can't say for sure.
As to whether your Fisher would handle the Gallos, I think so, but I can't say for sure.