(!!!) (Best Sylvania Pair) 12AZ7A Sylvania black plates NOS 1960”s (14.2/14.6ma and 12.6/12.8ma)

1 low noise pair) 12AZ7A Sylvania black plates NOS 1960”s

1 tube) 12.6/12.8ma Gm=6600/6800

1 tube) 14.2/14.6ma Gm=6800/7000

Good Ma 8-10ma

Good Gm range 4500-5500

– 12AZ7A is similar to 12AT7

– 12AZ7A in McIntosh MC275