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6DR7 GE branded Philco black plates NOS 1969 (2.0ma/38ma)
6DR7 GE NOS 1965 (1.1ma/36ma)
6DR7 Raytheon black plates NOS around 1960 (1.2ma/40ma)
6DR7 Sylvania branded GE black plates NOS 1977 (4.6ma/25ma)
