some type of electrical device with the words raytheon written on it
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12AU7 ( ECC82 ) RAYTHEON Long Black Plates Square Getter Matched Tubes Made in USA '57

12AU7 ( ECC82 ) RAYTHEON Long Black Plates Square Getter Matched Tubes MADE IN USA '57 Made by RAYTHEON in USA Same manufacturing date: 280 57-51 Logos worn as per photo Low Noise & Microphonics Tubes Tested on AMPLITREX AT-1000 Tube tester: Voltage Test: Va = 250V, Vg = -8,5V Average 100% Gm = 2200 ; Ia = 10.5 mA TEST RESULT: STRONG Valve 1: Section 1: Gm = 1550 ; Ia = 8.5 mA Section 2: Gm = 1450 ; Ia = 8.5 mA Valve 2: Section 1: Gm = 1550 ; Ia = 8.3 mA Section 2: Gm = 1450 ; Ia…

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