(!!!) (Best Sylvania Pair) 5879 Sylvania NOS 1960's - 1970's (1.6ma and 1.6ma) 1-2% matched

1 pair) 5879 Sylvania NOS 1960's - 1970's same build
1 tube) 1.6ma Gm=900 1970's
1 tube) 1.6ma Gm=1000 1960's

Matched on Amplitrex

Vplate=250

Vscreen=100V

Vgrid=-3

Good Ma range 1.5-1.8ma

Good Gm range 800-1000

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