(!!!!!) (Best Quad #2) JAN-6550A GE NOS 1985-1986 (129ma, 130ma, 131ma, 129.5ma) (Close Gm)

1 matched quad) JAN-6550A GE NOS original boxes 1980”s 1-2% matched

1 tube) 129ma Gm=11,400

1 tube) 130ma Gm=11,500

1 tube) 131ma Gm=11,200

1 tube) 129.5ma Gm=10.900

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