By the way, here is my current 40 m 807 transmitter.This was the first
attempt at building a valve TX.

people.physics.anu.edu.au/~dxt103/valves/807/

I will use the same type of chassis for the 472 kc version but I will
use an old 450-0-450 (50 mA), transformer which also has a 225-0-225
and 6.3 windings, for a more compact result. My hope is that I can
draw a bit more than 50 mA without overheating the transformer and is
based on the fact that CW is not 100% duty cycle and also I am not
using the other windings to their maximum current ratings.

73, Dimitris VK1SV