A 5-pin plastic base with domed envelope, getter stain. Donor’s card reads: “Dual grid power amplifier made by the Lansdale Tube Company for the Philco Corporation. Used as a Class A-1 or Class B ...
Marked: "Tuned Radio Amplifier / 150 to 3000 M / Serial No. 637 / Grebe Radio / Richmond Hill, N.Y. / Type RORN". Plate: Manufactured / under Grebe / Patents Granted / and Pending." Specimen is an ...
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