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1 pair) 6AU6A GE NOS 1977 (same Gm)
1 tube) 6.7ma Gm=4600
1 tube) 6.8ma Gm=4600
Good Ma range 6.5-7.5ma
Good Gm range 4000-4500
 (Best Overall Pair) 6AU6A GE NOS 1977 (6.7ma and 6.8ma) 1-2% matched (Sony C800G mic) "Pin It")
 (Best Overall Pair) 6AU6A GE NOS 1977 (6.7ma and 6.8ma) 1-2% matched (Sony C800G mic)&Category=&ImageURL=http://tubeworldexpress.com/cdn/shop/files/3_cbe0cc56-9acd-4343-b5f7-8c03696b5e18.jpg?v=1771920509){kind=link}