(!!!) (#1 2C51 Single) 2C51 Tungsol black plates "O" getter halo NOS 1960 (8.0/8.4ma) 1-2% section balance
(!!) (#1 396A) JW-2C51=396A Western Electric NOS 1959 in white box (7.4/8.6ma)
(!!) (#1 396A) JW-2C51=396A Western Electric NOS 1960 (8.4/10.5ma)
(!!) (#1 5670 PAIR 1950's) JG-5670=2C51 GE triple mica with D getter halo 1950's (matched on Amplitrex) 1-2% matched
(!!) (#1 5670 Sylvania Pair) JHS-5670 Sylvania NOS "O" getter 1965-1966 1-2% matched (high Ma and Gm)
(!!) (#1 5670 Sylvania) JHS-5670 Sylvania NOS 1966 (10.6/11.4ma) (highest Ma and Gm)
(!!) (#1 5670W GE PAIR) 5670W GE NOS 1980 1-2% matched (matched on Amplitrex)
(!!) (#1 5670W GE PAIR) 5670W GE NOS 1980-1982 1-2% matched (matched on Amplitrex)
(!!) (#2 5670 Sylvania Pair) 5670 Sylvania square getter halo NOS around 1960
(!!) 396A Western Electric NOS "D" getter halo 1970 (8.2/8.8ma)
(!!) 396A Western Electric O getter NOS 1972 reboxed (7.4/7.6ma)
(!!) JHS-5670 Sylvania NOS 1966 (8.5/10ma)
(!) (#1 2C51 Single) 2C51 Tungsol black plates "O" getter halo tests like new around 1960 (9.4/9.8ma) 1-2% section balance
(!) (#1B 5670 GE PAIR) JG-5670 GE triple mica with D getter halo 1950's (matched on Amplitrex)
(!) (#3 2C51 Best Single) JTL-2C51=396A Tungsol black plates "D" getter halo mid-1950's used/strong (7.4/8.0ma)
(!) (#3 2C51 Single) 2C51 Tungsol black plates "O" getter halo NOS 1960 (6.2/7.0ma)
(!) (#3 2C51 Single) JTL-5670=2C51 Tungsol black plates "D" getter halo used/strong 1957 (8.0/10.2ma)
(!) (#3 5670 GE) JG-5670 GE triple mica with D getter halo 1950's (7.4/8.6ma)
(!) (#3 5670 Sylvania) 5670 Sylvania NOS 1960 "D" getter halo (8.2/10.4ma)
(!) (#4 5670W PAIR) 5670W GE NOS 1981-1982 1-3% matched (matched on Amplitrex)
