(!!!!) (Best Pair) 6550C Svetlana Russian NOS 1998 (158.4ma and 159ma)
By Tube World
$ 189.99
1 pair) 6550C Svetlana Russia NOS 1998
1 tube) 158.4ma Gm=11,350
1 tube) 159.0ma Gm=11,300
Good NOS mA range 130-150mA
Sweet spot is 140mA
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