Steve writes:

Ok, we got the transformer in, physically it is smaller than the
other, mounting it shouldn't be a problem. Without a vacuum tube
plugged in, the regulators maintain regulation down to 100VAC line
voltage. Now I want to load it to make sure it does in fact have
enough headroom and that the transformer won't overheat. What sort of
load do these tubes impose on the circuit?

Not much. For the DV-4D tube used with the VT-4, the heater current is
29 mA at 320 mV, about 9 mW. So put a 10 ohm resistor between pins
3 and 5 of the octal socket but the power supply won't even notice.

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