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(!!!!!) (Best Value Single) CV378=GZ37 Mullard "D" getter NOS 1955 one plate is discolored (57/40 and 57/40) (1st version made with skinny bottle)
(!!!!) (2nd Best Single 1950's) ECC33=6SN7GT Mullard black plates platter getter halo NOS 1950-1955 (8.3/7.5ma)
(!!!!) (Best Overall Single) ECC33 Mullard gray plates "D" getter halo NOS 1961 (9/9ma) 1-2% section balance
(!!!!) (Best Single #1) 12AX7 RCA black plates branded Westinghouse "U" getter NOS 1950's (1.1/1.4ma and Gm=1700/1800) (strong mA and Gm)
(!!!!) (Best Single #2) ECC33=6SN7GT Mullard black plates platter getter halo NOS 1950-1955 (10.2/12.2ma)
(!!!!) (Best Single) EF86 Philips Holland NOS 1970 (4.0ma) (Highest mA and Gm)
(!!!!) (Best Single) JAN-CHS-6SL7WGT Sylvania brown base round black plates "D" getter NOS 1959 (2.6/2.6ma) 1% section balance (Highest mA and Gm)
(!!!!) (Best Value 1955) CV378=GZ37 Mullard UK "D" getter NOS 1955 (56/40 and 56/40)
(!!!!) (Good Value Pair) 8SN7GTB Sylvania GM Delco "chrome top" NOS 1957 same build (6.4/7.2ma and 7.4/6.2ma) (Schiit Freya, Rogue, Modwright OPPO, Cary) (1-5% matched)
(!!!!) (PAIR) 5751 Hitachi Japan glossy black ribbed plates triple mica double D getters 1960's (2.0/2.2ma and 1.8/2.2ma) (rare)
(!!!!) (READ REVIEW) GB-5931 Sylvania brown base gold brand 1960's (60/40 and 65/40)
(!!!!) (Recommended Single) JAN-CHS-6SL7WGT Sylvania brown base round black plates "D" getter NOS 1959 (1.9/2.0ma)
(!!!!) (Single 1955 era) CV492=12AX7 BRIMAR England NOS black ribbed plates "D" getter 1955 era (1.1/1.0ma) (Gm=1800/1700) (rare)
(!!!!) (Single 1955) 12AX7 BRIMAR England shiney black ribbed plates "D" getter 1955 (1.3/1.0ma) (Gm=1800/1700) (rare)
(!!!!) (Single 1958) 5751 Sylvania black plates triple mica D getter halo 1958 used/good (2.7/2.3ma)
(!!!!) (Single) 5751 GE NOS gray plates NOS 1981 (2.6/2.9ma) (Same Gm)
(!!!!) (Single) EF86 Philips Miniwatt Holland NOS 1963 (2.9ma)
(!!!) (BEST OVERALL SINGLE #2) GZ32 Miniwatt Dario France NOS 1956 (63/40 and 63/40) small rattle inside base
(!!!) (BEST OVERALL SINGLE) GZ32 Miniwatt Dario France NOS around 1955 (63/40 and 63/40) small rattle inside base
(!!!) (BEST PAIR #1) 6463 GE NOS 1965 (16.4/16.5ma and 16.8/17.8ma) (same pinout as 6350)
