A 8-pin plastic base with oval glass envelope. Stamped: “Tung-Sol / WE 717A”. Donor’s card reads: “Pentode made by Tung-Sol Electric Company for the US government during World War II. A high frequency ...
An 8-pin metal base with plastic insulator and center post, T-shaped envelope. Stamped: “12SJ7 / GT / Tung-Sol / Made in U.S.A.” Donor’s card reads: “Sharp cutoff pentode made by Tung-Sol Electric ...
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