Greeting I’ve been using the AN/PRC-25 A1 module NOS for $25.00
It’s a self-contained Low DC 9 to 16 volts in- High DC out 75-to 200V converter only 4 pins are used + - in and + - out I think grounds may even be common Its Small …
Depending on input DC it will produce from 75 to 200 VDC for tube receiver using miniature tubes
Built in filtering good to go
I’ve used it on GRC-9, GRC-109 , weird Chi-Com small HF radio and Zenith Trans-Oceanic Miniature tube receivers and have not had one die yet
Charles Agosti
WD8AXA