[Dave]

There seem to be two types of power supply common to tube amps: the first
uses a center-tapped x-former. A 240-0-240 model could run to a tube
rectifier, say a GZ34. Ground would be the center tap. You'd only be using
the two diodes in the tube rectifier, or you could substitute two silicon
diodes to get your 300-350VDC.

The other type is a non-center-tapped transformer. This uses four diodes in
a full-wave bridge configuration, with the negative output of the bridge
being used as ground. A 240V secondary with no center tap appears to
provide the same voltage as the center-tapped design. I've also seen a tube
rectifier and two diodes used in a non-cT PS.

My question is, other than removing the requirement for the silicon diodes,
is there any benefit to the use of a center-tapped transformer? My question
arises because I happen to have on hand several 240V transformers (step-up,
I live in N. America) but none are center-tapped. I'm guessing maybe the CT
transformer design can provide more current?

Dave S.