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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 ...

Marked: "Sterling R-401 / Vacuum Tube Tester / Serial No. 2563 / The Sterling Mfg. Co. Cleveland, Ohio, U.S.A." Unit is designed to test standard 201-A and 301-A triodes by measuring plate current on ...

THE student with a good knowledge of general physics will find this volume very helpful in studying radio-frequency phenomena. Modern thermionic tubes have so many important applications in physics ...

Get our weekly Home and Garden email for tips, and interior inspiration The best cordless vacuums offer a fast, convenient and hassle-free way to keep your home clean. Lighter and more manoeuvrable ...

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