(!!!) (Single) CK-5687 Raytheon black plates "O" getter like new 1960 (30/33.5ma)
(!!!) (slightly microphonic pair) E182CC=7119 Mullard SQ Holland NOS "O" getter halo 1963 (33.8ma/33.8ma and 35.2/34.4ma) (Same Gm)
(!!!) (slightly microphonic Single) E182CC=7119 Amperex PQ Holland NOS large "O" getter halo 1970 (35/37.2ma)
(!!!) 6BZ7 RCA black plates "U" getter NOS 1954 (9.6/12.2ma)
(!!) (Best Pair) 13EM7 Sylvania NOS 1960 era (1.4/56ma and 1.8/48ma)
(!!) (Best Single) 13EM7 RCA coin-base black plates NOS 1970's (2.7/47.2ma)
(!!) (Best Single) 6EM7 RCA black plates NOS 1969 (2.9ma and 53ma)
(!!) (Best Value Single 1961) 5687WA Tungsol bronze plates "O" getter halo used/very good 1961 (33.4/34.8ma)
(!!) (GOOD VALUE SINGLE) 5687 Tungsol rebranded IBM bronze plates "U" getter used/good 1959 (29/36ma)
(!!) (SINGLE) 5687 Tungsol rebranded IBM bronze plates "U" getter used/very good late 1950's (32.5/39ma)
(!!) 13EM7 RCA black base black plates NOS 1968 (2.0ma/28ma)
(!!) 6EA7 Sylvania NOS 1960 era (2.1/43ma)
(!!) 6EA7=6EM7 Sylvania coin-base NOS 1970's (1.8/53.6ma)
(!!) 6EM7 Sylvania NOS 1960 era (1.5/55ma)
(!!) JTL-5687WA Tungsol bronze plates "O" getter used/good 1958 (30/30.5ma)
(!) (BEST SINGLE) 6EM7 RCA coin-base black plates NOS 1970's (2.4ma and 57ma)
(!) (microphonic single tube) E182CC=7119 Philips SQ Holland NOS "O" getter halo 1963 (39.0ma/39.2ma)
(!) (RECOMMENDED PAIR) 15EA7=13EM7 GE NOS 1970 era
(slightly microphonic single) E182CC=7119 Amperex USA NOS 1981 (32/44ma)
13EM7 GE branded ITT NOS 1960's (2.2/38ma)
