(!!) (Best Value Pair) 6189W Philips ECG NOS by Sylvania 1983-1987 (8/10ma and 8.6/10ma)
(!!) 12AU7WA=6189 Sylvania NOS 1960's (8.8/9.0ma)
(!) 6189=12AU7A GE NOS 1975 (9.6/10ma) 1-2% section balance
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)
