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