(!!!!) (Best Value Pair) 6550C Svetlana Russian used/test like new 1998 (140ma and 142ma)
$149.99
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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 - ARC VS 110 and other ARC amps- Audio Research Reference 3 line-stage power supply - Rogue 90- VTL amps; MB300, 450, many others- Gibson guitar amp- McIntosh 275- Beard P100 MKII 1984- Cayin A-88T
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