I've got one - paid 3 dollars at a yard sale for it.
Older gentleman at the yard sale didn't know what it was, and said "a fellow just left to go get some money to buy it" - but I was first with the money. I was surprised when he said 3 dollars, and thought about offering more, but I wanted to get out of there ASAP.
My meter sticks, and I got it with no adapters. I scrounged a few socket savers from eBay buys. I first used it to test my 100+ 12AU7A tubes, all scrounged from old Conn organs. I think I can still quote all of the settings. 5 hours after starting, I gave up for 2 days - my fingers were getting numb!
My emissions tester is an old Sencore TC131 tube tester - Dad had one when I was a kid - I think I tore up his meter when I was 3 or 4 years old and the tester was new. I cooked the power tranny in it too - (8 volts across a 5GH8 for 36+ hours will do that) Mine is an eBay find, manual and all, but with sockets needing replacement. Great tester, but lies occasionally when testing IF tubes and the like.
Cheers,