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(!!) 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 Single 1969) ECC83=12AX7 Mullard UK ribbed plates NOS 1969 (163 series) (1.3/1.6ma) (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
(!!) (BEST SINGLE) 6BX7GT Sylvania triple mica NOS 1950's (55/57ma) (1-3% section balance)
(!!) (Best Value Single) ECC85=6AQ8 RCA Canada NOS 1970's faded printing (12.2/13.0ma)
1B5=25S Coronado NOS 1940's (20/14)
6F5 RCA metal can NOS 1950's (1.0ma Gm=1500)
6F5 RCA metal can NOS 1973 (1.1ma Gm=1500)
1B5=25S Ken Rad NOS 1947 (22/14)
