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If I'm not mistaken those are 21CT55's hanging from the rafters. You can tell by the type of brass trim bezel around the safety glass. I can't see knobs, but inthe photo with Dinah and Ethel Merman, you can definitely see the control panel below the screen, and it is a 21CT55 in that photo for sure.
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Vacuum tubes are used in Wisconsin to help heat your house.
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