I've got a Sencore CR161 CRT tester, but it's missing the #9 adapter. Are these hard to come by used? Or does anyone know someone with the know-how to make one? Thanks.

Never used that checker but a universal adapter is the way to go. If
it already has one you can use that. It will do any CRT. Only problem
can be spring contacts used mostly on Zenith & RCA tubes. In that
case you need to CAREFULLY remove the plastic key on the CRT.
After thats off you can grab the pins with the UA.

73 Zeno:smoke:
LFOD !

Thanks, Zeno. I did some research and found a pdf explaining how to make Sencore adapters. It provided a list of all the adapters and the way they're wired. Oddly a #9 adapter has the same wiring as a #16. I've got the #16 and it seemed to work.