(!!!!) (Best Overall Pair) JAN-12AT7WC Sylvania black plates NOS 1979-1980 (9.8/10ma and 10.8/9.8ma)

1 low noise pair) JAN-12AT7WC Sylvania NOS 1979-1980

1 tube) 9.8/10.0ma Gm=5300/5500 (1979 in 1980 box)

1 tube) 10.8/9.8ma Gm=5800/5200 (1980)

Matched on Amplitrex

Good Ma range 8-10ma

Good Gm range 4500-5500