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Well about the only old tube with a plate cap that resembles what you have is an 807, the most popular tube used back then. It's rated for a max of 750V on the plate but few rigs took it quite that high. If you are using AM, you need to back off the voltage to 600V so the modulator can have headroom to swing it up.
The tube in the next compartment is probably a 6AG7 and there seems to be a plugin coil there also. There is at least one VR tube in the power supply, perhaps to regulate the screen of the final and/or the B+ to the VFO. Yeah that 6AG7 is the VFO so the rig is much lower power, maybe 40W input because you can only get so much drive out of a decent VFO.
Chances are, it's an ARRL handbook design. You can rummage through those books in the vicinity of 1940 or 1941 looking for the circuit.
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