I found a DC power supply among the stuff that I had. This is a Syncor
PP-1659A/G military power supply called "battery charger". It is a multitap
transformer and a rectifier. Goes up to 150 volts and up to 20 amps.

I fixed up whatever physical damage it had (missing banana plug) and
now it seems to work well, except that on some settings it does not
seem to have good contact. Probably needs some multitap contacts
cleaned.

Anyway, I can set it to, say, 76 volts DC and just user it? Do I need
to put in any capacitors, since this is a pretty bare rectifier?

i