(!!!!!) (Best Pair #1) JAN-6550A GE NOS “”stapled plates”” 1985-1986 (135ma and 135.5ma) 1-3% matched

1 pair) JAN-6550A GE NOS “”stapled plates”” 1985-1986 – large shiney getters on both tubes – excellent pair – sweet lush midrange

1 tube) 135.0ma and Gm=11,300

1 tube) 135.5ma and Gm=11,700 small amount of pitting on top getter – on right – does not effect tube

Good Ma range 120-140ma

Good Gm range = 10,000 – 12,000

(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