1 low noise pair) 6FQ7/6CG7 GE NOS series filaments  

1 tube) 9.8/8.8ma Gm=2800/2800 faded printing

1 tube) 8.5/9.6ma Gm=2600/2800 green printing

Matched on Amplitrex

Vplate=250V

Vgrid=-8V

Good Ma = 7-8ma

Good Gm = 2300-2500

Recommended for

Conrad Johnson

Audio Research

Ampeg

Stax

Marantz