(!!!) (Recommended Pair) 12AZ7A Sylvania black plates NOS 1960”s same build (8.2/9.8ma and 8.4/9.8ma))

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

1 tube) 8.2/9.8ma and Gm=4600/5000

1 tube) 8.4/9.8ma and Gm=4600/5200

Good Ma range 8-10ma

Good Gm range 4500-5500

– 12AZ7A is very similar to 12AT7

– 12AZ7A in McIntosh MC275