(!!!!) (BEST OVERALL PAIR) 5670W GE NOS 1986 (8.2/8.2ma and 8.4/8.2ma) 1-2% matched
(!!!) (Slightly Microphonic Single) 5670=2C51 Tungsol black plates "D" getter NOS 1958 (9.6/10.2ma)
(!!) (Single) 2C51 Tungsol black plates "O" getter halo tests like new 1960's faded printing (7.6/7.0ma)
(!) 2C51=396A LM Ericsson Sweden NOS 1960's (11.8/6.8ma)
(!!!!) (Best Pair #2) 5670W GE NOS 1986 (8.0/7.2ma and 8.0/7.4ma) (same Gm) 1-2% matched
(!!!) (Best Single) JHS-5670 Sylvania NOS 1966 (12/10ma)
(!!!) (Single) JHS-5670 Sylvania NOS 1966 (7.0/6.8ma)
(!!!!!) (Best Pair) 5670W GE NOS 1986 (8.4/9.4ma and 8.6/9.2ma) 1-3% matched
(!!) (Single) JAN-5670W GE used/good 1970's (6.8/6.0ma)
(!!!) (Slightly Microphonic Single) 5670=2C51 Tungsol black plates "O" getter NOS 1960 era (8.4/8.8ma)
