This is a really nice closely matched pair of vintage RCA Black Plate 5963 's The 5963 is a high-reliability version of the popular 12AU7 twin triode. These make an excellent and reliable replacement for any 12AU7 currently in service and many audiophiles use them in their audio equipment. These rare 1960's vintage RCA tubes feature black plates and square frame getters at the top. The screening on the tubes is faded. No original boxes. No Gas or shorts. Straight pins. Properly tested on our calibrated TV-7D/U where minimum is 50 , well balanced Tube 1 T1 = 84 T2 = 85 Date code "ND" April 1963 Tube 2 T1 = 80 T2 = 78 Date code "NJ" October 1963 Buy with confidence, we are very proud of our 100% positive feedback.
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