(!!!) (Recommended Pair) 6GK5=6FQ5A Sylvania rebranded Raytheon NOS (8.2ma and 8.3ma)

1 pair) 6GK5=6FQ5A Sylvania rebranded Raytheon NOS

1 tube) 8.2ma Gm=12,500

1 tube) 8.3ma Gm=12,800

Tested on Amplitrex

Good Ma range 9-11ma

Good Gm range 13,00-15,000

- Conrad Johnson Premier 10, 14 preamp and DAC
- Supratek
- Wright