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(!!!!!) (Best Value Pair) 45 RCA/Cunningham engraved base used/75% (22.4ma and 23.8ma) (Close Gm) (Excellent sonics in SET amp)
(!!!!!) (Best Value Single) 45 Sylvania green leaf NOS 1940's production stains on glass (37.2ma) (Highest mA and Gm)
(!!!!!) (Good Value Single) 45 Sylvania branded RCA NOS 1952 production stains on glass (31.6ma)
(!!!) (Best Value Single) 45 Tungsol tests like new 1940's (40ma)
