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(slightly microphonic tube) JRP-5687 Raytheon NOS black plates D getter NOS 1957 (34.5/36.5ma)
(slightly microphonic - good value) 5687 Raytheon black plates NOS "square" getter halo 1950's (37/39ma) (strong Ma and Gm)
(!) (Microphonic Single) CK-5687 Raytheon black plates "U" getter NOS 1956 (31.5/31.0ma)
(!!!!) (microphonic single) 5687 Tungsol ribbed black plates "U" getter NOS 1952 (42/41.5ma) (1st series made)
(!!!!) (Best Single) JAN-5687WA Sylvania NOS 1967 (38/39ma) (Highest Ma and Gm)
(!) 5687 Raytheon part bronze part black plates used/tests like new 1960 (33/38ma)
(!!!!) (Best Single) JAN-5687WB GE NOS 1972 (34.6/35.6ma)
(!!) (Good Value Single) JRP-5687WA Raytheon bronze plates used/good early 1960's (33/31.6ma)
(!) (Best Value Single) 5687WA Sylvania JAN used/good faded printing 1970's (31/35.8ma)
(!!!!!) (Best Overall Single) CK-5687WB Raytheon black plates NOS 1960's (40.5ma/42ma) (Audio Note, Modwright, Manley) Highest mA and Gm
(!!!!!) (Best Overall Pair) JG-5687WA GE black plates NOS 1962 (37/38ma and 35/37ma) (low noise)
(!!!) (Good Value Pair) JHS-5687WA Sylvania used/very good 1960's faded printing (35.4/34.2ma and 37.0/36.5ma)
(!!!) (slightly microphonic Single) E182CC=7119 Amperex PQ Holland NOS large "O" getter halo 1970 (35/37.2ma)
(!!) (GOOD VALUE SINGLE) 5687 Tungsol rebranded IBM bronze plates "U" getter used/good 1959 (29/36ma)
(!!!!) (Best Single #3) E182CC=7119 Mullard SQ Holland NOS large "O" getter halo 1964 (30/34ma)
(!!!) (Best Pair) JRP-5687WA and JAN-5687WA Raytheon bronze plates tests like new 1964 era faded printing (33.4/36.4ma and 33.5/33.0ma)
(!!!) (slightly microphonic pair) E182CC=7119 Mullard SQ Holland NOS "O" getter halo 1963 (33.8ma/33.8ma and 35.2/34.4ma) (Same Gm)
(!!!!) (Good Value Pair) 5687WB GE used/good 1970 era (26/27ma and 26.6/27.8ma)
(!!!!) (Good Value Pair) 5687WB GE used/good 1970 era (26.2/27ma and 25.6/28ma)
(!!!!!) (Best Pair #2) 5687WA and 5687WB GE black plates like new 1970's (39/38.5ma and 37/41ma) (Highest Ma and Gm)
