Here is Class A amplifier circuit. It have good sound Distortion-free. First use main are transistors only. Second: 5W output use IC-low noise IC,MJ2955 power transistors [...]
This is three Simple 50w OTL audio amplifier circuit by 2N3055, can build easy and cheap, It's durable and very loud sound , Not needed speaker Protection. [...]
This is 60W RMS OTL integrated audio amplifier circuit using 2N3055 and normal transistor so cheap and can build easily and It's durable and very loud sound [...]
This is 100 watts OTL amplifier circuit using transistor,For small PA system, in the village. The sound is very loud and very durable,easy to builds better [...]
Although it is ancient, it is still interesting.
This is TBA820m Amplifier circuit stereo 2W+2W, supply voltage 12V, Easy to build and cheap. on DIP-8pins same LM386. but TBA820M use easy better. [...]