(!!!!) (Best Pair) 6189W Sylvania NOS 1976-1979 (9.5/9.6ma and 9.2/10.2ma) 1-3% matched
(!!!!) (Recommended Pair) JAN-6189W=12AU7WA Sylvania NOS 1972-1973 (9.6/10.6ma and 9.3/10.4ma) 1-3% matched
(!!!) (Best Single) 6189=12AU7WA=E82CC Sylvania NOS 1960's in white box (10/10.2ma) (Same Gm) 1-2% section balance
(!!!) (Recommended Pair) JAN-6189=12AU7WA Sylvania NOS 1973-1974 (8.4/9.8ma and 9.2/9.6ma)
(!!!) (Recommended Pair) JAN-6189W Sylvania NOS 1977-1978 (8.7/9.1ma and 8.6/8.8ma) 1-2% matched
(!!!) JHS-6189=12AU7WA Sylvania NOS 1966 in white box (8.5/10.2ma)
(!!!) JHS-6189=12AU7WA Sylvania NOS 1966 in white box (9.6/11.4ma)
(!!) (Best Value Pair) 6189W Philips ECG NOS by Sylvania 1983-1987 (8/10ma and 8.6/10ma)
6189W GE JAN NOS 1973 mica flake inside tube (9.0/9.2ma) 1-2% section balance
6189W GE JAN NOS 1981 (8.4/9.0ma)
6189W GE JAN NOS 1985-1986 (9/11.2ma)
JG-6189=12AU7WA GE double mica NOS 1963-1964 (10.2/12ma)
JG-6189=12AU7WA GE NOS 1964 (10.2/11ma)
JG-6189=12AU7WA GE triple mica NOS 1963 (8.6/10.4ma)