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6DN7 Sylvania NOS 1970 era (39ma and 7.5ma)
6DQ4 RCA NOS
6DQ5 GE Admiral NOS 1966 (90ma)
6DQ5 GE Admiral NOS 1966 (95ma)
6DQ5 GE Amperex NOS 1968 (88ma)
6DQ5 GE Amperex NOS 1970 era (131ma)
6DQ5 RCA black plate NOS 1974 (105.6ma)
6DQ5 RCA NOS 1970 (99ma)
6DQ6A Channel Master JAPAN used/strong (75ma)
6DQ6A Super Radiotron Australia NOS (69ma)
6DQ6B Curtis Mathes hi-fi JAPAN used/good 1960's (60.5ma)
6DQ6B GE NOS (55ma)
6DQ6B JAPAN NOS 1960's (64.5ma)
6DQ6B Raytheon JAPAN like new 1960's (60ma)
6DQ6B Sylvania NOS 1960's (75ma)
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)
6DS4 GE NOS 1967-1971 (1 pair)
