(!!!!) (Best Value Pair) 6550C Svetlana Russian used/test like new 1998 (140ma and 142ma)

1 pair) 6550C Svetlana Russia NOS 1998

1 tube) 140ma Gm=11,500 

1 tube) 142ma Gm=11,350 

Good NOS mA range 130-150mA

Sweet spot is 140mA

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