Description

(!!!!!) (Best Quad) JAN-5691 Sylvania black plates NOS 1979 1-3% matched (Cary, Rogue) (Best 6SL7GT sub) (same internals as 5691 red base)

1 low noise quad) JAN-5691 Sylvania black plates NOS 1979 1-3% matched

1 tube) 2.2/2.3mA and Gm=1600/1600

1 tube) 2.1/2.3mA and Gm=1500/1600

1 tube) 2.3/2.3mA and Gm=1600/1600

1 tube) 2.3/2.3mA and Gm=1600/1600

– very good detail 

– low noise

– reference tube

Good mA range 2.0mA+

Good Gm range 1500+

Recommended for

– Ampeg Heritage B-15
– Alessandro Itallian Greyhound jazz amp
– Alessandro Black and Tan 2005
– Almarro A318B
– Eddie Current

– Cary

– Rogue