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

1 tube) 7.2/8.0ma Gm=2400/2600 

1 tube) 7.0/7.8ma 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