1 low noise pair) 6FQ7 GE branded Amperex and Westinghouse NOS 1970's series filament
1 tube) 6.4/7.4ma Gm=2300/2600 GE Amperex 1973
1 tube) 6.4/7.4ma Gm=2400/2600 GE 1970's rebranded Westinghouse 1985
Conrad Johnson
Audio Research
Ampeg
Stax
Marantz