(!!) (BEST SINGLE) 13EM7 Sylvania NOS 1960 era (1.4/56ma)
(!!) (Best Single) 6EM7 RCA black plates NOS 1969 (2.9ma and 53ma)
(!!) (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)
(!) (SINGLE) 7119=E182CC Amperex PQ Holland used/good/tests good large "O" getter halo 1966 (33.0ma and 33.2ma)
(slightly microphonic single) E182CC=7119 Amperex USA NOS 1981 (32/44ma)
13EM7 GE branded ITT NOS 1960's (2.2/38ma)
13EM7 GE branded Raytheon NOS 1960's (1.6/40ma)
13EM7 Sylvania branded GE NOS 1963 (1.5/34ma)
13EM7 Westinghouse Canada NOS same build as RCA 1970 (1.3/38ma)
6BK7B Philco by Sylvania NOS 1960 (13.2ma/15.2ma)
6EA7 GE black base rebranded Zenith 1960 used/good (3.6ma/35ma)
6EA7 GE NOS 1965 (2.4ma/57.5ma)
6EM7 GE Amperex NOS 1970's (2.4ma/34ma)
