(!!!!) (Best Pair 1968) JAN-6189 Sylvania NOS 1968 (9.2/9.8ma and 9.8/9.5ma) 1-3% matched (same Gm)

1 low noise pair) JAN-6189 Sylvania NOS 1968

1 tube) 9.2/9.8ma Gm=2100/2200

1 tube) 9.8/9.5ma Gm=2100/2200

Matched on Amplitrex

Good Ma range 8-10ma

Good Gm range 1800-2200

– 6189 W is sub for a 12AU7 or 5814