[Paul Running]

I have stared at that schematic for a long time and thought about building it. It is essentially a 5F2-A Princeton, but with a pair of power tubes in single-ended format, rather than just one as in the actual Princeton (and Champ), and a paralleled pair of 5Y3 rectifier tubes for the added current requirement. Is the real increment to wattage, by adding the second power tube, enough to yield an audible boost in output level? I'll let you tell us, Alan. Looking forward to your report.

or a Gibson GA-8 with dual rectifiers:

 

[Paul Running]

 

[Paul Running]

As far as voltages go on the B+: I like the audio of lower plate voltages

Eureka!

 

[Paul Running]

A Hammond 280CX is rated 450+ watts...is this the XFMR of choice?
400VAC secondary will produce 565VDC, no-load.
6A filament current.
Is this the XFMR that you plan to use for the Angela?

 

[Paul Running]

read 499v no load and 345v on the plates(pin 3) loaded.

The secondary of the power transformer is overloaded...a 65mA rated secondary will be overstressed for full service of 2 × 6V6 in class A operation.

 

[Paul Running]

The thing about that style of Tone control is that the treble emphasis end of the control stops doing anything after volume is about 6 or so, while the treble-cut continues to work at any volume setting.

That will depend on the value of the tone pot...it's not noted on the schematic, probably because it is a select-on-test component, the value determining the frequency response of the inputted signal.

 

[Paul Running]

Nice retro style, Alan.