This tube is untested.
Item Tag: 932
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Sylvania 1229 For Beckman 932 Electrometer Tube Rare Black/Yellow Glass NOS NIB
These tubes are Sylvania’s clearly as the base says Sylvania on it with the Beckman label on top of it. These tubes have black coated glass on the bottom and yellow glass visible, where it’s not coded on top, which is very unique.