1 low noise pair) 6FQ7 GE NOS 1970's series filaments
1 tube) 7.2/9.5ma Gm=2500/2700 GE
1 tube) 6.5/9.4ma Gm=2400/2800 GE branded RCA

Good Ma range 7-9ma

Good Gm range 2300-2600

Recommended for

Conrad Johnson

Audio Research

Ampeg

Stax

Marantz