5879 Sylvania branded RCA NOS 1977 (1.4ma)

5879 Sylvania branded RCA NOS 1977 small mica flake inside tube

1.4ma

Gm=800

Tested on Amplitrex

Vplate=250

Vscreen=100V

Vgrid=-3

Good Ma range 1.5-1.8ma

Good Gm range 800-1000

recommended for:

– Divided by 13 RSA 31 amp
– Divided by 13 JRT 9/15
– AMPEX 620/621