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I see nothing marked on the side of tube and am a little nervous to pull it out as it doesn't give easily (not sure if I turn or lift straight up) The top of the tube is marked RCA, but that probably doesn't help much. The paper label has the numbers 12043 and on the inside another part says Rheostat pat. no. 85? or 35? Sorry I don't know much about these things, but thank you for your help.
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