1 low noise pair) JAN-5691 Sylvania black plates NOS 1977

1 tube) 2.8/3.1mA Gm=1800/1800

1 tube) 2.5/2.9mA Gm=1600/1700

- very good detail 

- low noise

• reference tube
• recommended for phono

NOS mA range 2.0mA+

NOS Gm range 1500+

Recommended for

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