Found an ad on FaceBook Marketplace for $200. Couldn't pass this up. Now I have a backup tester. The caddy is a little beat but I've wanted one for decades. Many of the tubes are for television. But, there are some 5U4, 5Y3, 12A*7, 6V6 and 12BH7 types. I probably paid top dollar for this stuff but you don't see it every day. The Heathkit TC-2 tube checker lights up and the scroll works. I found the manual online. Yay! If the tester is junk, I can still salvage ten vintage 3-way Tele switches and knobs from it.