(!!!) (BEST PAIR) 6463 GE NOS 1965 (16.4/16.5ma and 16.8/17.8ma) (same pinout as 6350)
(!!!) (BEST PAIR) 6463 GE NOS 1966 (16.8/21ma and 17.6/21.5ma) (Highest mA and Gm)
(!!!) (Best SIngle 1950's) 12AT7 Brimar UK black plates "O" getter halo NOS late 1950's (11.6/12.8ma)
(!!!) (Best Single) 12AZ7 Tungsol black plates "D" getter halo NOS 1955 (12ma/14ma)
(!!!) (Best Single) 6X4 Tungsol NOS 1957 "D" getter (54/40 and 57/40)
(!!!) (Best Single) 6X4 Tungsol NOS 1957 "D" getter (57/40 and 55/40)
(!!!) (Best Value Pair) 6SN7GTB GE low hours/like new 1955-1958 (8.2/9.0ma and 7.6/8.2ma) (Schiit, Ayon, Rogue) (close Gm)
(!!!) (Good Value) JG-5814A GE triple mica "U" getter halo like new 1955 in white box (8.8/9.6ma)
(!!!) (Recommended PAIR) 6463 GE NOS 1965 (15.0/16.4ma and 15.6/15.8ma) (same pinout as 6350)
(!!!) (Recommended single) 12AT7 Brimar UK black plates "O" getter halo copper grid posts NOS 1957 (16.0/15.2ma)
(!!!) (Recommended Single) 12AY7 Tungsol tall gray ribbed plates rebranded Raytheon NOS "D" getter 1950's (3.3/4.0ma)
(!!!) (Recommended Single) 6106 Bendix rebranded 5Y3WGTA Heintz & Kaufman NOS 1950's (65/40 and 66/40) 1-2% section balance
(!!!) (Recommended Single) JTL-6X4W Tungsol NOS 1955 curved "D" getter (48/40 and 50/40)
(!!!) (Recommended Single) JTL-6X4W Tungsol NOS 1955 curved "D" getter one section of internal plate bent at bottom (52/40 and 57/40)
(!!!) (Recommended Single) JTL-6X4WA Tungsol NOS 1962 curved "D" getter (55/40 and 60/40)
(!!!) (Single) 6J5G Sylvania engraved base black oval plate used/very good 1930's (8.0ma)
(!!!) 12BH7 GE Silvertone gray oval plates NOS "U" getter 1953 (8.2/8.0ma)
(!!!) 6SL7WGT Sylvania branded Raytheon 5691 brown base round black plates "D" getter halo used/good 1950's (1.6/1.8ma)
(!!!) 6SL7WGT Sylvania brown base round black plates like new 1955 no printing (2.6/2.8ma)
(!!!) JTL-6X4W Tungsol NOS 1955 curved "D" getter halo (45/40 and 52/40)