I located nice (looking) Sylvania Test-a-color jig, complete with a pile of adaptors, but it seems the CRT shows bad grid leakage on the green gun.
It has a MV13VAHP22 CRT in it. I wonder how scarce that tube is to find these days? Will a 13VAHP22 also work it this application? I've no idea what the MV stands for. Thanks for any ideas.
Kevin