[Chuck Schwark]

I wonder if the electrolyte formula is known still, so the rectifier could be revived....


No wonder it is called "battery eliminator", looks like battery itself.

I believe those electrolytic rectifiers used a boric acid solution(?) - nothing too exotic, if I remember from the 
info I have on it.  Would have to dig out the manual on that beast.

You'd most likely also have to put new electrodes in the jars as well, depending on the state they're in now.

Chuck