(!!!) (BEST VALUE PAIR) 6SN7GTB RCA coin-base 1970-1975 (10.4/9.6ma and 9.4/10.6ma)

1 low noise pair) 6SN7GTB RCA coin-base 1970's
1 tube) 10.4/9.6ma Gm=3000/2900 
1 tube) 9.4/10.6ma Gm=2700/2900 

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