Even if you could get the high voltage down far enough, the HP-23
doesn't have enough current capacity for the TR-4's three final tubes.

gil wrote:

I wonder if anyone here has modified a HP-23 to be used with Drake
gear?
The high voltage on the HP-23 runs about 800 volts and in the Drake
AC-4 at 650 volts, Im sure the other voltages differ from one to the
other as well.
Would like to know if there is a way to mod the PS.

Any input appreciated

Thanks for reading, Gil n2wjw