This is the circuit diagram of 150W power amplifier which built using power transistors. The circuit above is essentially a mono channel circuit. To make it into a stereo channel, you have to build the two identical circuits. 150W is high enough for the audio system in a small field or in the hall/meetinghouse.
To maintain performance remains excellent and prevent damage to the power transistor caused by excessive heat, then you must install the heatsink on the transistor Q7 to Q12.
On 150W power amplifier circuit schematic above is included the simple power supply circuit that very easy to built. Transformer to use is 3A minimum for mono applications, and 5A minimum for stereo applications. For better performance, maybe you could try using a regulated power supply that is certainly capable of providing a large current and voltage as needed by this power amplifier circuit.
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Is the 150W is RMS or THD? Can you clear it please?
Thanks in advance,
RMS isn't a valid measurement of power output, to start with, secondly THD means "Total Harmonic Distortion". You were meaning peak power. I would say it'd be peak power judging by the topology and power supply.
R23 and c10 are doing nothing as they are grounded from both ends.