1 low noise pair) 6FQ7 Zenith by GE NOS 1977 series filaments

1 tube) 6.5/10.6ma Gm=2500/2500 

1 tube) 6.7/9.2ma Gm=2600/2600 

Matched on Amplitrex

Vplate=250V

Vgrid=-8V

Good Ma = 7-9ma

Good Gm = 2300-2500 

Recommended for

Conrad Johnson

Audio Research

Ampeg

Stax

Marantz