Editor’s Note: Ever wonder how much those old transistor radios, valves, multimeters, or telephones you’ve been hanging onto all these years might be worth now? Well, wonder no longer: Steve Johnson ...
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 ...
There is nothing simple about a good vacuum tube tester. In fact, most tube testers were very complicated to set up for each different type of tube to be tested. Testing a quantity of different tubes ...
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