(!!!!) (Used Pair) 6550C Svetlana Russian used/good 2001 (134.6ma and 137ma)
By Tube World
$ 79.99
1 pair) 6550C Svetlana Russian used/good 2001
1 tube) 134.6ma Gm=10,750
1 tube) 137.0ma Gm=10,400
Good NOS mA range 130-150mA
Sweet spot is 140mA
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