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6CM7 GE NOS 1974 (4.4ma and 19ma)
6CM7 GE Zenith NOS 1969 (7.5ma and 25ma) (highest mA and Gm)
6CM7 RCA NOS 1960's (4.6ma and 17.5ma)
6CM7 Westinghouse Canada NOS 1960's (5.0ma and 16.6ma)
