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(!!) (Best Pair) ECC40 Philips Import NOS made by La Radiotechnique, Chartres/France 1960 (6.0/6.2ma and 6.1/6.4ma) (Same Gm) 1-2% matched
(!!!!!) (Best Pair) ECL82=6BM8 Mullard NOS 1967-1970 (2.6/37.5ma and 2.3/34ma) 1-5% matched
(!!!) (BEST VALUE PAIR) 6SN7GTB RCA coin-base 1970-1975 (10.4/9.6ma and 9.4/10.6ma)
(READ REVIEW) 6SN7GT Tungsol tests like new black coated glass and black round plates 1945 (9.2/9.0ma) (close triode balance)
(!!) (Best Pair #2) 407A Western Electric D getter NOS 1966-1968 (40-40/26 and 42-43/26) 1-5% section balance
(!!!!) (Best Pair) 6U8A Philips by Sylvania NOS 1986 (14/10ma and 14.2/9.6ma)
(READ REVIEW) 6U8A Philips by Sylvania NOS 1986 (18.3/7.6ma and 18.3/8.0ma) 1-3% matched
(!!!) (Best Single) 5965A GE "5 Star" NOS 1964 (13.8/15ma)
(!!!!) (Best Pair #3) JAN-5842WA Raytheon NOS 1984-1985 (20.6ma and 20.8ma) 1-3% matched
(!!!) (Recommended Single) 6EU7 RCA NOS 1967 (53/32 and 60/32)
(!!!) (Best Single 1965) JHS-12AX7WA Sylvania NOS 1965 (1.3/1.5ma and Gm=1700/1800)
(!!!) (Recommended Pair) 6AU6A RCA used/test like new 1960's (7.8ma and 8.0ma)
(!!!!) (Best Pair #3) ECC81=12AT7 Mullard UK NOS 1968-1970 (9.4/11.2ma and 9.8/11.2ma) 1-3% matched (sweet sound)
(!!!) 12DW7=7247 CBS ribbed plates NOS 1960 (0.9ma/11.4ma)
(READ REVIEW) (Best Pair) 6U8A GE NOS 1974-1977 (15.0/10ma and 16.5/10.4ma) (tuner)
(!) (Microphonic Single) CK-5687 Raytheon black plates "U" getter NOS 1956 (31.5/31.0ma)
(!!!!) (Best Pair #1) 5670W GE NOS 1986 (9.0/8.2ma and 8.6/9.0ma) 1-3% matched
(!!) 7N7 Sylvania NOS 1960's (8.6/10.2ma)
(!!!!) (Best Single) 12BH7A Tungsol black plates "O" getter halo 1960 era (13.2/13.5ma)
(Henry Sennett pair) JAN-5842WA Raytheon NOS 1984-1985
