Chassis config

I did some testing with the power transformer, output transformer and choke, laid out on the chassis, to determine least noisy orientation. By design, the power transformer (PT) generates a 60 cycle hum that can be picked up by nearby wiring or the output transformer (OT, which ultimately sends amplified signal to the speakers). By connecting headphones to the otherwise disconnected OT  and powering up the PT, I can hear how they interact in close proximity and orient the OT to best avoid the unwanted hum. Same with the choke and OT. 

(This photo, taken later, shows the orientation of the transformers and choke, which seems to eliminate noise in the output transformer.)

Then I drilled holes and started populating the chassis with sockets, stand-offs, etc.

The tube spacing is tight, but I think oriented as best as can be for quiet wiring.

Tranny test

 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.