(!!!) (Recommended Pair) 6GK5=6FQ5A Sylvania rebranded Raytheon NOS (11.0ma and 11.4ma)

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

1 tube) 11.0ma Gm=12,300

1 tube) 11.4ma Gm=15,400

Tested on Amplitrex

Good Ma range 9-11ma

Good Gm range 13,00-15,000  

- Conrad Johnson Premier 10, 14 preamp and DAC

- Supratek (Australia)

- Wright Sound phono