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(!!!!!) (Recommended Single) M8137=CV4004=12AX7 Mullard branded Philips box plates NOS 1966 (Gm=1500/1400 and 1.0/0.8mA)
(!!!) (Best Single #3) 12AX7A Sylvania NOS 1970's (Gm=2400/2600 and 1.6/1.9ma)
(!!!!) (BEST PAIR) 6EU7 Tungsol Dumont "D" getter NOS 1963 (50-51/32 and 49-52/32) 1-3% matched
(!!!!) (Best Pair #1) 448A Western Electric tipped top used/test like new 1965 (27.2ma and 27.3ma) 1-2% matched
(!!!!) 12BH7A Westinghouse gray ribbed plates used/good "U" getter 1960 era (8.4/11ma)
6A7G Sylvania used/tests like new 1946 (48/29)
(!!!!) (Gold Brand Single) GB-6SL7WGT Sylvania brown base NOS 1960 era (1.6/1.5ma)
(!!) (Best RCA Single) JRC-6189=12AU7WA RCA black plates "D" getter NOS 1957 (8.6/9.0ma)
(!!!!) (Best Single) EF86 Mullard UK branded Philips Miniwatt "D" getter NOS 1954-1955 (3.3ma, Gm=2100) (oldest single)
(!!!!) (Recommended Pair) 6FQ7 Zenith by GE NOS 1977 (6.5/10.6ma and 6.7/9.2ma)
51 Arcturus Blue Balloon used/very good 1930's (46/26)
512AX Raytheon NOS (3 in stock)
52 NOS
526AX Raytheon NOS (5 in stock)
53 NOS
53 US Brands NOS (2 in stock)
533AX Raytheon NOS (3 in stock)
534AX Raytheon NOS (4 in stock)
53HK7 US Brands NOS (8 in stock)
547DX Raytheon NOS (3 in stock)
