(!!!!) (Best Single) GB-6189=12AU7WA Sylvania Gold Brand Gold Pins 1960's (10.6/11.2ma) (High mA and Gm)
(!!!!) (Best Single) JHS-5751WA Sylvania NOS black plates triple mica "D" getter halo 1956 (2.5/2.7ma)
(!!!!) (Best Sylvania Pair) JHS-5687WA Sylvania black plates NOS 1962 (31/35ma and 32/37ma)
(!!!!) (Best Sylvania Pair) JHS-5687WA Sylvania black plates NOS 1962 (34/40ma and 33/39ma)
(!!!!) (Recommended Pair) JAN-6189W=12AU7WA Sylvania NOS 1972-1973 (9.6/10.6ma and 9.3/10.4ma) 1-3% matched
(!!!) (Best Value Pair) JAN-6189W=12AU7WA Philips by Sylvania NOS 1987 (7.6/8.4ma and 7.4/8.2ma) 1-3% matched
