Cademan, Electronjohn Or anyone, I would love to know, if you could, where the fuse, or what the amp draw is for this unit? If you can help, cool. If not, I understand. I can't find anything on this gem. The "Dim Bulb" build is cool, but I just decided, since I buy a lot of vintage gear, that I should just invest in a decent Variac. Which I did. It's now here, but, I've seen the best way to use it, is along side with, a Clamp on style AC Amp meter. I have an old RS Multimeter, that they haven't made in years. Of course that's all null and void now, since RS closed up shop for good, but I think I may just be able to use it, in parallel, instead of the clamp type.
Either way, I read from several websites, on how to use the Variac, correctly, for old tube units. I'd just like to have that information, of how many amps it draws, because it can tell you the "Health" of the unit, as you're dialing up the volts.