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(!) (Best Pair #2) 6SF7 Raytheon NOS 1955 (12.8ma and 13.4ma)
(!) (Best Pair) 6SF7 Tungsol NOS 1954 (12ma and 12.2ma) 1-2% matched
6SF7 Sylvania NOS 1950's (12.4ma)
6SF7 Tungsol NOS 1954 (12.4ma)