(!!!) (Best tipped top pair) 448A Western Electric tipped top used/tests like new 1965 (35.5ma and 36.4ma) (Matched on Amplitrex)
(!!!) (Best Pair #3) 448A Western Electric tipped top used/good 1965-1966 (28ma and 29.2ma) (same Gm)
(!) 448A Western Electric smooth top used/good "D" getter halo 1963-1970 (1 pair: 35ma and 36.5ma) (Matched on Amplitrex)
(!) 448A Western Electric smooth top used/good 1965-1966 (1 pair: 19.2ma and 20.8ma) (Matched on Amplitrex)
(!) 448A Western Electric smooth top used/good 1971 (1 pair: 28ma and 29.4ma) (Matched on Amplitrex)
(!) 448A Western Electric smooth top used/strong 1965-1970 (1 pair: 37ma and 37.5ma) (Matched on Amplitrex)
(!) 448A Western Electric smooth top used/strong 1966-1970 (1 pair: 37ma and 40.5ma) (Matched on Amplitrex)
(!!!) (Best Pair #1) 448A Western Electric tipped top used/like new 1965-1966 (32.6ma and 31.8ma) (close Gm matching)
(1 set of 10 tubes) 448A Western Electric "SMOOTH TOP" used/test like new/85-95% output with "D" getter 1960-1971
(1 set of 10 tubes) 448A Western Electric "TIPPED TOP" used/test like new 85-95% with "D" getter 1960's
(!!!) (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)
(1 set of 10 tubes) 448A Western Electric "TIPPED TOP" used/good 75-85% with "D" getter 1965-1966
(!!!) (Best Pair #4) 448A Western Electric tipped top used/tests like new 1965 (26.4ma and 26.8ma)
