(!!!!) (Best Overall Pair) 6550 Tungsol gray plates NOS 1975 (139ma and 140.5ma)

1 matched pair) JAN-6550 Tungsol gray plates NOS (7517=1975) same date codes - 3 large getters 1 tube) 139.0ma Gm=11,450 1 tube) 140.5ma Gm=11,400   Matched on Amplitrex     Recommended for - 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