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(!!!!) (Recommended Pair) JAN-CRC-30 RCA NOS 1940's same build (2.9ma and 3.0ma)
(!!!!) (Single) 12AU7 RCA Italy ribbed plates NOS 1960's (8/10.6ma)
(!!!!) (Single) 6BK7B GE gray plates NOS "U" getter 1963 (6.2/5.4ma)
(!!!!) (Single) 6BK7B RCA NOS "U" getter 1950's (7.5/8.5ma)
(!!!!) (Single) 6BK7B RCA NOS 1960's faded printing (7.4/7.4ma)
(!!!!) (Single) 6BK7B RCA NOS 1962 (7.4/8.3ma)
(!!!!) (Single) 6BK7B Tungsol branded RCA "U" getter 1957 (10/14ma)
(!!!!) (Single) EF89=6DA6 Telefunken Germany <> bottom NOS 1966 (7.0ma)
(!!!!) (Single) EF89=6DA6 Telefunken Germany <> bottom NOS 1966 faded printing (9.6ma)
(!!!!) 56 Arcturus Blue Balloon engraved base tests like new 1930's (5.0ma)
(!!!!) UX-280 RCA Radiotron Balloon used/60% 1930 era some white oxide flakes inside tube (38/40 and 38/40)
(!!!) (#1 19J6 Pair) 19J6 RCA "U" getter halo NOS 1952 same date codes
(!!!) (#1 56 National Union Pair) 56 National Union rebranded Western Electronics NOS 1940's (5.0ma and 5.2ma)
(!!!) (#2 19J6 Pair) 9J6 RCA NOS 1950's - 1960's same internal plate structure, different getter halo shape
(!!!) (Best Overall Pair) 12BE6 GE branded Brimar NOS 1960's (2.6ma and 2.6ma) 1% matched (Highest ma and Gm)
(!!!) (Best Overall Pair) 12DQ6B Philco by Sylvania NOS 1960's (81ma and 82ma) 1-3% matched
(!!!) (Best Overall Pair) JHS-6J6WA Sylvania NOS "D" getter halo 1960 (9.8/10.4ma and 9.8/10.5ma) (Highest Ma and Gm) 1-2% matched
(!!!) (Best Pair #1) 56 Sylvania black plate NOS 1940's branded Western Electronics 1940's slightly tilted glass (6.1ma and 6.1ma) 1-2% matched
(!!!) (Best Pair #1) 6146B RCA NOS 1968-1970's (96.5ma and 100ma)
(!!!) (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)
