(!!!) (Recommended Pair) 6FQ7 Sylvania NOS 1960's same build (6.5/7.2ma and 6.8/7.6ma)

1 low noise pair) 6FQ7/6CG7 Sylvania NOS 1960's same build 1 tube) 6.5/7.2ma Gm=2300/2350  1 tube) 6.8/7.6ma Gm=2300/2500 branded Philco   Matched on Amplitrex Vplate=250V Vgrid=-8V Good Ma = 7-9ma Good Gm = 2300-2500   - Stax SRM-T1S, SRM 007T, SRA-35- Stax SRM-006tII- Marantz 8B- Marantz 2- ARC D79, D79A- Moscode 401HR amp- Conrad Johnson Premier 8A Monoblocks- Conrad Johnson PV-9A preamp- Conrad Johnson Premier 11A- Art Audio Vinyl 1 phono stage regulator tube- Gill Audio Elise DAC- AVA T8+ preamp- Audio Research D-250 MKII Servo- Leben