Michael Black VE2BVW wrote:
The solid state replacement doesn't use filament power, so the load on
the transformer is less.

Yes, and will result in 15 Watts less heat in the cabinet
with the 5U4 gone. Stability will be improved
and warm-up time reduced. Just don't forget
to add the 200 Ohm resistor to bring the B+ back to normal.

73,
Ed Knobloch