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(!!) 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)
(!!) JTL-5687WA Tungsol bronze plates "O" getter used/good 1958 (30/30.5ma)
(!) (microphonic single tube) E182CC=7119 Philips SQ Holland NOS "O" getter halo 1963 (39.0ma/39.2ma)
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)
6EM7 GE Canada NOS 1960's (2.9ma/30ma)
6EM7 RCA black plates NOS 1965 (1.2ma and 30ma)
6EM7 RCA coin-base used (2.5ma/28ma)
6EM7 RCA NOS 1965 (4.2ma/31ma)
6EM7 Sylvania NOS 1970 (1.5ma/47ma)
6EM7 Sylvania Silvertone NOS 1960's (1.5ma/55ma)
