(!!!) (BEST VALUE PAIR #1) 6SN7GTB RCA coin-base 1970-1975 (10.4/9.6ma and 9.4/10.6ma) Title: 6SN7GTB RCA NOS coin-base

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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