Product code: 1935 Vacuum Tube Testing adapter shops tester Octal 950-G-E-M Radio tubes
Before television existed, the octal base for vacuum tubes was developed. This suddenly made a ton of old tube testers obsolete...unless you bought this add-on! It has setting codes for 30 or so of the very first octal tubes to be tested on antique vacuum tube testers. NA-ALD made it. 950 GEM chart has more settings. Dark brown bakelite. Very rare collector's piece. I can't find any info about it online. Ironically, I haven't shops tested it.
Before television existed, the octal base for vacuum tubes was developed. This suddenly made a ton of old tube testers obsolete...unless you bought this add-on! It has setting codes for 30 or so of the very first octal tubes to be tested on antique vacuum tube testers. NA-ALD made it. 950 GEM chart has more settings. Dark brown bakelite. Very rare collector's piece. I can't find any info about it online. Ironically, I haven't shops tested it.