The way to juice as much power from a class A amp and increaae its efficiency is to decouple the load with a transformer rather than a capacitor. Now the efficiency is 26% but another issue has arisen. The frequency reaponse is quite poor. The low end is 40Hz (with significant attenuation). The high end is 20Khz (barely) after which the distortion increases. Output power is 30W and the power draw is 116W.
