(!!!!) (Best Siemens Single) ECC83=12AX7 Siemens Halske Germany branded SONOTONE NOS 1960 (Gm=1900/2200) (1.3/1.7ma)
(!!!!) (Best Siemens Single) ECC83=12AX7 Siemens Halske Germany branded SONOTONE NOS 1962 (Gm=1900/1700) (1.5/1.3ma)
(!!!!) (Best Single) 12SN7GTA Sylvania branded GE NOS 1960's (11.0/11.4ma) (same Gm)
(!!!!) (Best Single) 6146B GE NOS 1980 (121ma)
(!!!!) (BEST SINGLE) 7581A GE tan base green printing 1960 era (73.5ma)
(!!!!) (Best Single) 8068 GE NOS 1983 slightly tilted glass (47.5ma)
(!!!!) (Best Single) ECC83=12AX7 Telefunken Germany <> bottom smooth plates 1964 (1.3/1.5ma and Gm=1700/1800)
(!!!!) (Best Single) EF89=6DA6 Telefunken Germany <> bottom NOS 1966 (7.6ma)
(!!!!) (Best Single) EF89=6DA6 Telefunken Germany <> bottom NOS 1966 (8.0ma)
(!!!!) (Best Value Pair 1965 era) 12AX7=ECC83 Philips Miniwatt Holland like new 1964-1965 era (1.3/1.2ma and 1.1/1.2ma)
(!!!!) (Best Value Pair) 6021=CV3986 Mullard UK Whyteleafe plant NOS 1972 original boxes (4.4/7.0ma and 4.8/6.0ma)
(!!!!) (Best Value Pair) 6BQ7A RCA black plates NOS "D" and "U" getter 1957 (9/16ma and 9/14.5ma)
(!!!!) (Best Value Pair) 6FQ7 RCA clear top NOS 1967 (6.2/6.0ma and 6.0/7.4ma) (same Gm) (STAX, MARANTZ, CONRAD JOHNSON)
(!!!!) (GOOD VALUE PAIR) 408A Western Electric NOS 1972 and 1976 (78/60 and 80/60)
(!!!!) (Good Value Pair) 6JT6A RCA like new and NOS 1960's (58ma and 60ma)
(!!!!) (Pair) JAN-6C4WA Sylvania NOS 1975 (7.8ma and 8.6ma)
(!!!!) (Read Review) 12AX7A=ECC83 Matsushita Japan NOS rebranded Raytheon NOS 1970 era (Gm=1800/1800 and 1.5/1.3ma) (similar to Mullard)
(!!!!) (Recommended Pair) 27 Philco by Sylvania NOS 1940's (6.0ma and 6.3ma)
(!!!!) (Recommended Pair) 27 Philco by Sylvania NOS 1940's (6.4ma and 6.7ma)
(!!!!) (Recommended Pair) 6AW8A GE NOS 1965-1973 (2.6/23.2ma and 2.6/21ma) (Shindo)
