(!!!!!) (BEST QUAD #2) JAN-6550A GE NOS 1985-1986 (138ma, 139ma, 136.6ma, 137.6ma)

1 matched quad) JAN-6550A GE NOS original boxes 1980's 1-2% matched 1 tube) 138.0ma Gm=11,300 1 tube) 139.0ma Gm=10,800 1 tube) 136.6ma Gm=10,600 1 tube) 137.6ma Gm=10,700   Matched on Amplitrex  Good NOS Ma range 120-140ma Good NOS Gm range = 10,000 - 11,000   (warm and punchy midrange, good bass, a very good 6550 second only to Tungsol 6550 in overall sound and drastically superior to Svetlana or Sovtek 6550) - ARC VT60, ARC VT100 MarkII and MarkIII, Ref. 300, Ref. 600 - Audio Research Reference 3 line-stage power supply - Luxman- Rogue- Cary - VTL MB300, MB450, ST-150- CJ Premier 8 and 11A, 12- Jadis - Ampeg SVT- Comins Alessandro Jazz Guitar Amp - Cary SLI-80 - THD - VAC PA100/100- McIntosh 275 MK IV 2005- Harmon Kardon- Audio Aero Capitole Integrated amp