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.