[morzh]

So, good news is: all the tubes test good. The open circuit was due to one of the 7B7 loctals having oxidized pins, so even after testing well on the tester it would not complete the circuit upon the re-insertion, at which point I simply scraped the pins and then it worked out.

I brought it up on my Variac, saw the pilot lamp coming on, simply waited for the tubes to glow, spun the tuning cap pulley, and without the loop antenna connected got my local station where I expected it. It plays nicely, no hum.

Now the chassis need light dusting and the case need some cleaning and maybe polishing.

Some pics:

Before and after recap: