2X YO 186 ~ RE 604 TELEFUNKEN POWER TRIODE YEAR 1940 FULLY TESTED WITH RPG4/3 TEST RESULTS EMISSION 30mA (WHERE 17mA = 100%) POWER TRIODE TESTED WITH FUNKE RPG4/3 TUBE TESTER MONO PLATE STRONG TEST RESULTS EMBEDDED ON PICTURE MADE IN RUSSIA 1940's FINEST RUSSIAN TUBE VALVE LAMPE ROHRE

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