A 4-pin plastic base with domed envelope. Donor’s card reads: “Ballast tube made for Sears, Roebuck & Co. for use in their “Silvertone” line of radio receivers. Dates from the 1920s. Maximum current: ...
A 4-pin plastic base with top contact, domed envelope. Stamped on base: “Silvertone / 5BX”, on envelope: “1A4” Donor’s card reads: “Remote cutoff pentode, glass type, sold in early 1930s by Sears, ...
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