A 7-pin glass base with tipped T-shaped envelope. Miniature tube. Stamped: "12BE6 / RCA Electron / Tube [RCA logo]”. Donor’s card reads: “Pentagrid converter made by the Radio Corporation of America ...
An 8-pin base with center post, metal shell, and top contact. T-shaped envelope. Stamped on envelope: "1A7 / GT/G”; on base: RCA logo. Donor card reads: “Pentagrid converter made by the Radio ...
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