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(!!!!!) (Best Single) 12AX7=ECC83 Mullard UK branded Philips ribbed plates NOS 1965 (1.0/0.9ma) (163 series)
6BN5=EL85 Mullard UK NOS 1959
(!!!) (Best RCA Pair #2) 6BL7GTA RCA clear top side getter NOS 1966-1969 (38.5/39.5ma and 40.5/36.0ma)
(!!!) (BEST PAIR) 6BX7GT Sylvania "D" getter halo NOS 1950's (57.6/62.6ma and 64.0/58.0ma) (close triode balance)
(!!) 6BL7GTA RCA low hours/like new 1961 (42.2ma/43.6ma) 1-2% section balance
(!!) 6BL7GTA RCA low hours/like new 1962 (38.4ma/38.2ma) 1-2% section balance
(!!!!) (BEST PAIR) 6BL7GTA GE branded RCA/Raytheon"D" getter halo NOS 1950's (37.0/38.2ma and 35.5/42.2ma) (close Gm matching)
(!!!) (Best Single) 6BX7GT Sylvania Motorola triple mica "O" getter NOS 1963 (73.6ma/75.6ma) (close triode balance)
(!!!!) (Best Single) ECC32=CV181 Mullard branded Philips Miniwatt brown base/black plates "D" getter halo mid-1950's (6.2/6.4ma) 1-2% section balance
(!!!!!) (Best Mullard Pair #1) 12AX7=ECC83 Mullard UK ribbed plates NOS 1966 same date codes (1.4/1.1ma and 1.3/1.2ma) 1-2% matched
(!!!!!) (Best Single 1967) ECC83=12AX7 Mullard UK ribbed plates NOS 1967 (163 series) (1.4/1.2ma) (same Gm) (sweet sound)
(!!) (Best Single) 6U8A Philips by Sylvania NOS 1986 (22.4ma and 12.2ma) (Highest mA and Gm)
(!!!) (Recommended Single) 5691 RCA Red Base branded Westinghouse black plates used/good 1960 (1.8/2.1ma)
6JK6 Sylvania branded RCA NOS 1974 (7.2ma)
(!!) (Best Pair #1) 12AU6 RCA NOS 1957-1959 (9.4ma and 9.6ma)
(!) (Best Pair #3) 12AU6 RCA NOS 1957-1961 (9.6ma and 10.2ma)
12AU6 RCA NOS 1957 (8.6ma)
1A4P=1A4G Sylvania NOS 1940's
1B5=25S GE NOS 1950 (21/14)
(!)(Best Single) 6K8G RCA NOS 1948 (49/25 and 56/30) strongest output
