5691 RCA Red Base Black Plates used 1948 (2.2/2.4ma) (Gm=62% and 75%)

5691 RCA Red Base Black Plates used 1948 in white box

1 section) 2.2ma Gm=1000 (62%)

1 section) 2.4ma Gm=1200 (75%)

Tested on Amplitrex

Good Ma = 2-3ma

NOS Gm = 1500-1600

for:

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