(!!!!) (Best Pair) 6550C Svetlana Russian NOS 1998 (163ma and 167ma)
By Tube World
$ 189.99
1 pair) 6550C Svetlana Russia NOS 1998
1 tube) 167ma Gm=11,400
1 tube) 163ma Gm=11,750
Good NOS mA range 130-150mA
Sweet spot is 140mA
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