1 low noise tube) JAN-5691 Philips by Sylvania black plates NOS 1985 some pitting on glass (white dots - hard to see in photo)

2.4ma Gm=1650

2.6ma Gm=1700

- 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