You are looking at very large Toggle Switches pulled from an old Military radio control panel. They appear to be made by Cutler-Hammer and have a part number of AN-3230-2 on them. They are hermetically sealed types and are made for switching very large currents.
Here is a working tube tester by Heathkit - the IT-21. Tests nearly all tubes - 4, 5, 6, 7 pin mini, octal, 9 pin mini, 9 pin Novar,... Yes, the roll chart turns easily and it's easy to understand the set-up.
template_preview SPDT 3 Pin terminals ON/OFF/ON 3 Position Toggle Switch. Can be used on low voltage or high voltage circuits ideal for switching lights or motors.Each switch is designed with 2 hex nu
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