(!!!!!) (Best Single 1958) 12AX7=ECC83 Mullard UK "long plates" NOS 1958 (1.3/1.4ma)
(!!!!!) (Best Single 1963) CV492=12AX7 Mullard UK NOS 1963 (161 series) (1.3/1.3ma) 1% section balance
(!!!!!) (Good Value Single) 12AX7 BRIMAR BVA England narrow ribbed plates like new 1959 (1.0/1.2ma)
(!!!!!) (Recommended Single) 421A Western Electric NOS 1969 (85ma and 75ma) (rare)
(!!!!!) (Recommended Single) 421A=5998 Western Electric NOS 1984 (81ma and 94ma)
(!!!!!) (Recommended Single) ECC83=12AX7 Telefunken Germany smooth plates NOS 1963 (1.0/1.3ma and Gm=1500/1700)
(!!!!!) (Recommended Single) ECC83=12AX7 Telefunken Germany smooth plates NOS 1972 (1.3/1.3ma and Gm=1700/1700) 1% section balance
(!!!!!) 12AU7 Philips Holland "O" getter halo 1969 low hours/tests like new (9.6/8.6ma)
(!!!!) (2nd Best Single) JAN-5998 Tungsol black plates top and side getter NOS 1966 (88ma and 101ma)
(!!!!) (2nd Best Single) JAN-5998 Tungsol black plates top and side getter NOS 1966 (91ma and 103ma)
(!!!!) (Best Overall Single) JAN-5998=421A Tungsol black plates top and side getter NOS 1966 (124ma and 119ma) (Close Gm)
(!!!!) (BEST PAIR) 6DN7 GE branded GE and CBS NOS 1959 same build (46.4/46.5ma and 8/9ma)
(!!!!) (Best Single 1959) ECC82=12AU7 Miniwatt Holland "D" getter 1959 (ct3-delta9I) (11.2/11.4ma)
(!!!!) (Best Single) 5692 CBS Hytron Brown base NOS 1957 (9.4/9.0ma) (same Gm)
(!!!!) (Best Value 1965) 12AX7 Philips Miniwatt Holland like new 1965 (Gm=1900/1700 and 1.5/1.2ma)
(!!!!) (Best Value 1965) 12AX7 Philips Miniwatt Holland like new 1965 (Gm=2000/2000 and 1.6/1.7ma) (Highest mA and Gm)
(!!!!) (BEST VALUE SINGLE) GZ32 Miniwatt Dario France NOS around 1955 (62/40 and 64/40) rattle inside base
(!!!!) (Best Value used) ECC83=12AX7 Fisher Mullard ribbed plates used/good 1964 (.8/1.2mA Gm=1400/1600)
(!!!!) (Best Value used) ECC83=12AX7 Fisher Mullard ribbed plates used/good 1964 copper grid posts (.7/.8mA Gm=1400/1500)
(!!!!) (Good Value Pair) 12BH7A GE NOS gray oval plates "o" getter halo 1961-1965 (7.2/6.6ma and 8.4/6.8ma)