A 4-pin plastic base with two top contacts, domed envelope. Stamped on base: RCA logo. Donor’s card reads: “Power triode made by the Radio Corporation of America in the 1920s. Used in the Class C ...
A 4-pin plastic base with domed envelope. Stamped on base: RCA logo. Donor’s card reads: “Triode made by the Radio Corporation of America. A high vacuum tube used as a radio frequency amplifier and ...
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