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(!!!!) (Good Value used pair) 6SN7GTB Sylvania chrome top black plates 1956-1958 used/good (7.0/6.8ma and 6.6/6.6ma)
(!!) (Best Single) 13EM7 RCA coin-base black plates NOS 1970's (2.7/47.2ma)
(!!) 13EM7 RCA black base black plates NOS 1968 (2.0ma/28ma)
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)
