(!!!) (Recommended Single) 5691 RCA Red Base black plates used/good 1959 (2.3/2.0ma)

1 low noise tube) 5691 RCA Red Base black plates used/good 1959 in white box

1 section) 2.3ma Gm=1500

1 section) 2.0ma Gm=1500

Good used Ma = 1.5 - 2.0ma

Good used Gm = 1400-1500

 for:

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