Marked: "Sterling Type R-511 / Tester for AC & DC Tubes / & DC tube reactivator. / A.C. Volts 115 Cycles 50 / Serial No. ____ / The Sterling Mfg. Co., Cleveland, Ohio ...
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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