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(!) (Best Pair) 352A WE NOS 1964 original boxes (1 pair)
401A Western Electric
407A LM Ericsson Sweden like new 1960's (41/26 and 42/26)
407A LM Ericsson Sweden used/good 1960's
407A Sylvania branded RCA gold pins used/good 1971
407A Sylvania branded RCA NOS 1977
407A Sylvania gold pins used/good 1960's
407A Western Electric like new 1968 in white box (54/26 and 64/26)
(!!) (Best Overall Single) 407A Western Electric NOS 1963 (53/26 and 53/26) 1-2% section balance
407A Westinghouse Canada NOS 1960's
(1 PAIR) 408A Western Electric used/good 1964 (79/60 and 78/60)
415A Western Electric NOS 1960 (1 in stock)
416B=6280 WE NOS
416C Western Electric
(!!!) (Best Pair #2) 448A Western Electric "tipped top" used/tests like new D getter halo 1965-1966 reboxed (30ma and 31.8ma) (close Gm matching)
(!!) (Recommended Pair) 448A Western Electric tipped top used/good 1965 same date codes (26ma and 27.5ma) (close Gm matching)
(!!!!) (Best Pair #1) 448A Western Electric tipped top used/test like new 1965 (27.2ma and 27.3ma) 1-2% matched
(!!) 403A=6AK5 Western Electric NOS 1974 (6.6ma)
6AS6=409A Western Electric used/tests like new 1951 (5.4ma)
(!!) (PAIR) 713A Western Electric by Tungsol NOS 1942-1943 (6.2ma and 6.3ma)
