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(!!) (Recommended from 1950's) 12AT7WA Sylvania gray plates triple mica "D" getter halo tests like new 1950's (9.4/12.0ma)
(!!) (Recommended from 1958) JHS-12AT7WA Sylvania triple mica "D" getter NOS 1958 (11.6/15ma) (phase inverter, reverb)
(!!) (Recommended from 1964) 12AT7WA Sylvania NOS 1964 (7.0/8.4ma)
(!!) (Recommended Pair) 12AZ7=12AZ7A GE branded Admiral/Westinghouse black plates NOS 1960 (9.0/9.4ma and 9.2/8.0ma) (McIntosh MC275)
(!!) (Recommended Pair) 12AZ7A GE Admiral black plates NOS 1960 (8/9ma and 8/10ma) (McIntosh MC275)
(!!) (Recommended Pair) 12B4A GE NOS 1960's - 1970's same build (30ma and 30.5ma)
(!!) (Recommended Pair) 5879 RCA branded Raytheon NOS 1960's (2.2ma and 2.4ma)
(!!) (Recommended Pair) 6AC7=VT-112 RCA 1941-1942 used/very good (13/15.3ma) (close Gm)
(!!) (Recommended Pair) 6AE5GT Tungsol branded RCA NOS 1940's (6.7ma and 6.8ma)
(!!) (Recommended Pair) 6AG7 RCA NOS 1960's (30.6ma and 32ma)
(!!) (Recommended Pair) 6AG7 RCA NOS 1960's same date codes (27.5ma and 29.2ma)
(!!) (Recommended Pair) 6AG7Y RCA brown bottom NOS 1958-1964 (27.8ma and 28.8ma)
(!!) (Recommended Pair) 6CS7 GE Canada NOS black plates 1965-1969 (18/11.2ma and 20/9.6ma) (close Gm)
(!!) (Recommended Pair) 6CS7 Sylvania 1956 and Sylvania branded GM Delco "D" getter NOS 1956 with partially wrinkled top getter (19/10.8ma and 18.5/11.2ma) 1-3% matched
(!!) (Recommended Pair) 6DJ8 GE NOS 1974-1980 (13.5/14.2ma and 12.4/13.5ma)
(!!) (Recommended Pair) 6EU7 GE NOS 1970-1978 (44-48/32 and 43-48/32)
(!!) (Recommended Pair) 6GK5=6FQ5A GE NOS 1968-1981 (10.4ma and 11.2ma)
(!!) (Recommended Pair) 6HA5=6HM5=EC900 Amperex Holland "Globe Logo" NOS in white boxes 1971-1972 (17ma and 18ma) (Highest mA and Gm)
(!!) (Recommended Pair) 6J6A Tungsol NOS "D" getter 1961 (7.5/8.8ma and 7.8/9.2ma)
(!!) (Recommended Pair) 6KZ8 Sylvania branded Raytheon NOS
