That Hickok is called the "Cardmatic". All the usual knob-and-switch setup stuff is replaced by a grid of spring-loaded plunger switches. The perforated plastic card has holes that cover some switches and expose others. The hole pattern configures the tester for a particular type tube, and determines the socket wiring, filament voltage, full-scale gain and all that.
I have watched a 123 tester on fleabay for six months or more. There's one listed at $999.99 but it's been there a while, no takers. Gotta unload my spare 123R, but it's a "project". We replaced all the usual old-age parts and got it working 7 or 8 years ago, but one of the calibration steps just wouldn't quite set like it's supposed to. It was going to be the 'spare' unit, and never really got fully rehabbed. It stopped being the spare tester when we upgraded to the computerized version. Can't imagine languishing in the back room all this time has done it any good.
And that's the challenge. Finding a tube tester that isn't also a "project" to get cleaned up and calibrated properly.
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