(!!) (2nd Best Pair) 6DR7 GE black plates NOS 1960's-1973 same build (1.6/1.7mA and 26/25mA)
6DR7 GE black plates NOS 1963 (1.5ma/57ma)
6DR7 GE branded Philco black plates NOS 1969 (2.0ma/38ma)
6DR7 Raytheon black plates NOS around 1960 (1.2ma/40ma)
6DR7 RCA NOS 1970's (1.6ma/51ma)
6DR7 RCA Rauland NOS 1961 (1.7ma/50ma)
6DR7 Sylvania black plates NOS 1970's (1.4ma/37ma)
6DR7 Sylvania branded GE black plates NOS 1977 (4.6ma/25ma)
