In this case its probably best to gut it since you don't need the oscillator circuit. You can make a pentode input amp with the 5879 or a dual triode input amp with the 12AX7. Just follow one of the Champ schematics. The 6AQ5 is the same as a 6V6 with a slightly lower power level. Great for making an amp to use at recording sessions. Go to one of the tube info sites and print the pinouts.