(!!) (Best Pair) 6GK5=6FQ5A Hitachi Japan rebranded Raytheon and GE NOS 1970 era (9.6/10ma)

1 pair) 6GK5=6FQ5A Hitachi Japan rebranded Raytheon NOS 1970 era

1 tube) 9.6ma Gm=13,300

1 tube) 10.0ma Gm=13,400

Tested on Amplitrex

Good Ma range 9-11ma

Good Gm range 12,000-15,000

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