(!!) (Recommended Pair) 5879 RCA branded Raytheon NOS 1960”s (2.2ma and 2.4ma)

1 pair) 5879 RCA branded Raytheon NOS 1960”s
1 tube) 2.2ma Gm=1000
1 tube) 2.4ma Gm=1100

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