(!!!!) (BEST PAIR #2) JG-12AT7WA=6201 GE NOS "blue tip - red dot" triple mica, "O" getter halo, gray plates 1960 (9.0/8.8ma and 8.8/9.0ma) 1-3% matched
(!!!!) (BEST Pair #3) 6CW4 GE NOS 1974-1978 (105/60 and 107/60) (strong emission)
(!!!!) (Best Pair #3) 7N7 Sylvania branded RCA 1960 era (8.4/8.4ma and 8.6/8.8ma) 1-3% matched
(!!!!) (Best Pair #3) 7N7 Sylvania branded RCA amd Sylvania 1960 era (8.4/9.5ma and 8.6/9.8ma) (same Gm) 1-3% matched
(!!!!) (BEST PAIR #4) JG-12AT7WA=6201 GE NOS "blue tip - red dot" triple mica, "O" getter halo, gray plates 1960-1961 (8.4/7.2ma and 8.0/7.8ma) 1-5% matched
(!!!!) (Best Pair 1963) JG-5751 GE double mica gray plates NOS 1963 (2.0/2.2ma and 2.0/2.1ma)
(!!!!) (Best Pair) 12AT7=6679 GE gray plates NOS (9.5/10ma and 9.8/10.5ma)
(!!!!) (Best Pair) 12AT7=6679 GE gray plates NOS 1977 (7.5/9ma and 7.7/9ma) 1-2% matched
(!!!!) (Best Pair) 12AU7A GE NOS 1968-1969 (9/10ma and 9.2/9.2ma) (Same Gm) (Warm and smooth)
(!!!!) (Best Pair) 12AX7 GE branded 12AX7A International NOS 1977 (1.3/1.3mA and 1.4/1.4ma) (Same Gm) 1-2% matched
(!!!!) (Best Pair) 12SN7GTA GE coin-base side getter NOS 1980 (8.4/8.0ma and 8.2/8.4ma) 1-2% matched
(!!!!) (Best Pair) 12SN7GTA GE coin-base side getter NOS 1980 (8.6/8.6ma and 8.8/8.6ma) 1-2% matched
(!!!!) (BEST Pair) 5963=12AU7 RCA NOS ribbed plates 1965-1973 (12.4/12.6ma and 11.4/11.6ma) (Highest mA and Gm)
(!!!!) (Best Pair) 5R4GB GE black base NOS (48-51/40 and 50-52/40 x 2 tubes)
(!!!!) (Best Pair) 5R4GB GE black base NOS 1981 (51-54/40 and 52-55/40 x 2 tubes)
(!!!!) (Best Pair) 5V4GA GE branded Raytheon NOS 1960's (60-60/40 and 60-60/40)
(!!!!) (Best Pair) 5V4GA GE branded Raytheon NOS 1960's (60-60/40 and 60-61/40)
(!!!!) (Best Pair) 5V4GA GE NOS (60-60/40 and 60-60/40)
(!!!!) (BEST Pair) 6CW4 GE NOS 1966-1970 (117/60 and 118/60) (strong emission)
(!!!!) (BEST Pair) 6CW4 GE NOS 1975-1976 (120/60 and 120/60) (strong emission)
