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(!!!!) (Best Overall Pair) 12AX7A RCA gray ribbed plates NOS 1974 same date codes (best tone) (1.3/1.2ma and 1.3/1.1ma) (Fender, McIntosh, Rogue Audio
(!!!!) (Best Pair #1) 6F8G Raytheon black parallel ribbed plates NOS 1940's (8.8/7.8ma and 7.4/7.6ma) (same Gm)
(!!!!) (Best Pair 1960) 12AX7 GE tall gray ribbed plates "U" getter like new 1960 (1.2/1.2ma and 1.3/1.2ma) 1-3% matched
(!!!!) (Best Single 1956) 12AX7 GE Motorola tall gray ribbed plates "U" getter 1956 like new (Gm=1700/2000 and 1.6/2.1ma)
(!!!!) (Best Single 1960) 12AX7 GE tall gray ribbed plates "U" getter NOS 1960 (Gm=1700/1600 and 1.5/1.1ma)
(!!!!) (Best Single) 6550 Tungsol branded RCA NOS vented plate NOS 1965 (130ma) (Recommended for Audio Research Ref power supply)
(!!!!) (Best Single) JAN-5998 Tungsol NOS black plates NOS 1966 same build as 421A Western Electric (87ma/73ma)
(!!!!) (Best Value Pair) 12AX7A RCA gray ribbed plates NOS 1968-1974 (best tone) (0.8/0.9ma and 0.8/1.0ma) (Fender, Rogue, McIntosh, CJ)
(!!!!) (Best Value Single 1960) 12AX7 GE tall gray ribbed plates "U" getter tests like new 1960 faded printing (Gm=1600/1600 and 1.1/1.3ma)
(!!!!) (Good Value Single 1960) 12AX7 GE tall gray ribbed plates "U" getter used/good 1960 (Gm=1600/1450 and 1.1/0.9ma)
(!!!!) (Recommended Single 1954) GL-6201=12AT7WA GE "5 STAR" black plates triple mica D getter 1954 tests like new (8.2/8.4ma)
(!!!!) (Recommended Single) 2A3 RCA gray plates NOS 1972 (119ma)
(!!!!) (Single) 5691 RCA branded GE red base black plates NOS 1960's a few vertical scratches on base (2.1ma/2.3ma)
(!!!!) (Single) 5691 RCA branded GE red base gray plates NOS 1960's (2.1ma/2.4ma)
(!!!!) (Single) 6CG7 Tungsol NOS 1960 era black shield between plates - pin #3 slightly shorter (8.6ma/10ma)
(!!!) (Best Pair #3) 6973 Sylvania and Sylvania branded GE gray plate NOS 1970's - 1980 (60ma and 58ma)
(!!!) (Best Pair) 5814A GE "5 STAR" NOS 1971-1972 (10.7/10.3ma and 9.8/10.2ma) (best 12AU7 sub)
(!!!) (Best Pair) 6973 Sylvania branded GE gray plates NOS 1970 (44ma and 46ma)
(!!!) (Best Single #2) 5814A=12AU7 GE "5 STAR" with "O" getter halo 1967 (10.6/10.2ma) (Same Gm) 1-2% section balance
(!!!) (Best Single 1953) JG-5814 GE NOS "square getter halo" and "short wide ribbed dark black plates" 1953 in white box (11.0/12.5ma)
