I couldn't find a wiring diagram for the power transformer, so decided to do some testing to figure it out...
I later wrote the manufacturer and the doc they sent based on the model # validated my findings and cleared up some confusion about a couple of leads from the secondary winding. This transformer is unusual (at least for the size/class of amp I'm dealing with) in that it is tapped for two separate 6.3V circuits - I wasn't looking for that possibility as I tested, so having found one 6.3 V circuit, couldn't quite figure out what the additional leads were for.
The transformer is pretty beefy - easily meets my needs, and probably was meant to drive a 4-tube power section.
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