Most of us use a voltage divider for the HV, Screen and Oscillator voltages. Easy to build.

The HV needs to be 550V @ 200 mA at a MINIMUM.

Check the specs on your HP-23 variant. The HP-23B has a HV rating of 700v @ 250 mA. That should be fine using a variac in front of the HP

Mark K3MSB

On Mon, Feb 24, 2025 at 12:20 PM Russ Tine via ARC5 <arc5@mailman.qth.net> wrote:

Hi Folks,

I'm new to the list, and I am looking for some advice about using an HP 23 power supply for my T-22.

I still use the power supply for my HW 101, so I do not want to make any mods to the PS itself, I would rather add a voltage divider external to the PS that I could plug in for the T-22 and remove for the HP 23.

Thanks in advance and 73,

Russ Tine K1RWT
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