(!!!) (Best GE Pair) 12AZ7A GE gray plates NOS 1970's (10.6/10.0ma and 11.2/9.8ma)
(!!!) (Best Pair) 12AZ7A Toshiba branded Raytheon Japan gray plates NOS 1960's (11.3/12.3ma and 11.4/11.8ma)
(!!!) (Best Single) 12AZ7 Tungsol black plates "D" getter halo NOS 1955 (12ma/14ma)
(!!!) (Best Sylvania Pair) 12AZ7A Sylvania black plates NOS 1960's (14.2/14.6ma and 12.6/12.8ma)
(!!!) (Recommended Pair) 12AZ7A GE Admiral black plates NOS 1960 (10/9ma and 9.2/10.5ma) (McIntosh MC275)
(!!!) (Recommended Pair) 12AZ7A GE gray plates NOS 1969-1970 (8.2/8.0ma and 8.7/8.8ma) (McIntosh MC275)
(!!!) (Recommended Pair) 12AZ7A Hitachi branded Raytheon Japan gray plates NOS 1960's (10.0/10.8ma and 9.6/10.7ma)
(!!!) (Recommended Pair) 12AZ7A RCA black plates NOS 1970's (8.6/9.6ma and 7.6/9.2ma) (McIntosh MC275)
(!!!) (Recommended Pair) 12AZ7A Sylvania black plates NOS 1960's same build (8.2/9.8ma and 8.4/9.8ma))
(!!) (#Recommended Single) 12AZ7 Tungsol black plates "U" getter halo NOS mid-1950's (9.0ma/9.2ma) 2% section balance
(!!) (Good Value Single) 12AZ7 Tungsol black plates "U" getter halo NOS 1950's (7.5ma/7.5ma)
(!!) (Recommended Pair) 12AZ7A GE Admiral black plates NOS 1960 (8/9ma and 8/10ma) (McIntosh MC275)
(!!) (Recommended Pair) 12AZ7A GE gray plates NOS 1971-1981 same build (11.2/12.6ma and 12.5/13.2ma) (close Gm)
(!) (Single) 12AZ7A Tungsol gray plates "O" getter halo NOS 1960 era (8.4ma/9.0ma)
12AZ7 GE black plates "D" getter halo NOS 1955 (11ma/7.5ma)
12AZ7A GE Zenith gray plates NOS "U" getter halo 1960 (15ma/9.6ma)
12AZ7A RCA black plates NOS 1975 (7.6/9.2ma)
12AZ7A RCA branded Zenith black plates "D" getter NOS 1966 (8.0/8.8ma)
