Some of the most popular and sought-after models of tube testers today for antique radio and vintage audio service are military surplus. Popular models of military tube testers for use today were ...
Marked: "Sterling / R-402 / Vacuum Tube Tester / Serial No. 5764 / The Sterling Mfg. Co., Cleveland, Ohio, U.S.A." Instruction label pasted beneath unit. In original box with instruction sheet. Same ...
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