The logical next step from the EL84-Drive-EL84 Amplifier is to go to direct coupling between the driver and output, and eliminate the coupling capacitor. I have built two amplifiers based on the circuit below, with stellar results. Someday I will build another one. I'm sure the forum trolls/experts will squawk, but no local or global feedback is used. If you build one, be sure to make sure that you keep the heater to cathode voltage differential within limits. The voltage divider I used works, but there are other ways to skin that cat.