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(!!!!!) (Recommended Pair) 12BH7A GE ribbed plates NOS 1970's (9.6/10.4ma and 8.2/9.6ma) (sweet sound)
(!!!!) (Best Overall Single) GZ37 Mullard UK NOS 1966 (52/40 and 52/40) 1% section balance
(!!!!) (Best Pair 1966) CV378=GZ37 Mullard NOS 1966 (52-52/40 x 2 tubes) 1% matched
(!!!!) (Best Pair) GZ37 Mullard NOS 1966 (50-50/40 x 2 tubes) 1% matched (Allnic, Art Audio)
(!!!!) (Best Single #1) 12BH7A RCA NOS 1964 (13.2/12.4ma)
(!!!!) (Best Single #2) 12BH7A RCA NOS 1963 (10.6/11.6ma)
(!!!!) (Best Single) CV378=GZ37 Mullard UK NOS 1967 (50/40 and 50/40) 1% section balance
(!!!!) (Best Single) CV378=GZ37 Mullard UK NOS 1967 (51/40 and 51/40)
(!!!!) (Best Value 1955) CV378=GZ37 Mullard UK "D" getter NOS 1955 (56/40 and 56/40)
(!!!!) (Best Value Single) 12BH7A RCA EI Yugo smooth plates NOS 1970's (11.5/13.2ma)
(!!!!) (Best Value Single) GZ37 Mullard UK NOS 1966-1967 slightly tilted glass (51/40 and 52/40)
(!!!!) (Recommended Pair) 12BH7A GE branded Zenith and Daystrom gray oval plates "O" getter NOS 1960's (11.0/11.3ma and 10.3/10.5ma)
(!!!!) (Recommended Pair) 12BH7A Westinghouse black ribbed plates "U getter halo 1961-1962 (8.5/10ma and 7.5/9.5ma)
(!!!!) (Recommended Single) CV378=GZ37 Mullard UK NOS 1967 (52/40 and 54/40) 1-3% section balance
(!!!!) (Single 1950's) 12BH7A RCA branded Westinghouse narrow black plates NOS "U" getter mid-1950's (10.6/7.4ma) (1st series made)
(!!!!) (Single) 12BH7 Tungsol branded Shield gray oval plates "U" getter halo NOS 1961 (11.8/16.5ma) (Highest mA and Gm)
(!!!!) (Single) 12BH7A GE gray oval plates NOS mid-1960's (11.5/16ma)
(!!!!) (Single) 12BH7A Westinghouse black plates "D" getter NOS 1961 (6.2/7.0ma)
(!!!) (Best Single 1957) 12BH7A GE NOS gray oval plates large "U" getter halo 1957 (12.5/11.0ma)
(!!!) (Single) 12BH7A RCA NOS 1970's (16.4/9.6ma)
