(!!!!!) (Best Pair) 6189W Sylvania NOS 1981 (9/10.2ma and 10/9ma) 1-3% matched (same Gm)
(!!!!) (Best Overall Pair) JAN-6189W Sylvania NOS 1977-1978 (8.7/9.1ma and 8.6/8.8ma) 1-2% matched
(!!!!) (Best Pair) JAN-6189=12AU7WA Sylvania NOS 1972-1973 (9.3/10.4ma and 9.6/10.6ma) 1-3% matched
(!!!!) (Recommended Pair) JAN-6189W=12AU7WA Sylvania NOS 1973-1974 (9.2/9.6ma and 9.8/8.6ma)
(!!!) (BEST PAIR) JG-6189=12AU7WA GE double mica NOS 1963-1964 (10.2/12ma and 10.2/11ma)
(!!!) (Good Value Single) JAN-6189=12AU7WA Sylvania NOS 1960 era in white box (8.6/10ma)
(!!!) 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)
JG-6189=12AU7WA GE triple mica NOS 1963 (8.6/10.4ma)
