What a humongous transformer! Those blue Mallory's CGS series are very good I've gathered from Nelson Pass. I have them in my Threshold amps and they're still measuring okay.These were at a local estate sale which i tend to avoid but i think it was all under the radar and i made an offer.
Yes both amps-Otiz and Forte as well as the Diffet2 pre-amp function well.
below are a couple shots i snagged upon research.
My son and I ran a dedicated 30 amp receptacle for such occasions …Yes. My brother had 2, 20A circuits installed for his audio gear, including the Otez.