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The #23 socket on my tester is loose on some tubes and I have to hold it a certain way in order to get it to make contact. Maybe I'll one day make one from a socket from a scrap board; but, these days, I find myself not needing to test tubes that recent. Up until a few years ago, I was constantly testing tubes that used socket #23. That's the most common socket for inline CRT's made between the late '70's and the end of the CRT TV era. The last time I checked with B&K, they were very proud of their socket adapters. The other common color sockets were #31 that fits many later smaller screen inline tubes, #3 that fits most rectangular delta gun color tubes, #20 that fits EFL gun tubes found in Zenith, Sylvania, and Magnavox sets from the late '70's-early '80's, and #24 that fits most '80's RCA inline CRT's. I think my #3 and #31 are a little loose, as well. Oddly, B&K never made a socket adapter for later Sony Trinitron CRT's; so, I made my own from a socket from a junk board and the proper molex connector.
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