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Here is a circuit 120 watt stereo amplifier using STK4241V . The MAX9710 a stereo audio power amplifier capable of delivering 2 x 120 W of the IC to put loads of 8 ohms. MAX9710 can be operated from ± 32V single power supply of ± 54V. This amplifier circuit is ideal for audio devices for home supply. STK4241V amplifier specifications might lead one to believe that you can use supply voltages of ± 78V. With zero input signal (and therefore no way out) I could, but I would not recommend anything better than ± 45V 8-ohm loads, if expected, although ± 54V will be fine if you can provide a good heat sink.

This Home Stereo Amp is equiped with STK4241V wich is a thick film hybrid IC, AF Power Amplifier (Split Power Supply) (120W+120W min, THD = 0.08%). STK4241V has some features like: • Muting circuit built-in to isolate all types of shock noise • Current mirror circuit for low 0.08% total harmonic distortion For this 2x120W home stereo power audio amplifier we use a single monochip STK4241V to obtain up to 120W for each channel. Amplifier home stereo components: R6, R22 – 560 ohm / 0.125W R1, R24 – 1K / 0.125W R9, R10 – 1K / 0.5W R7, R18 – 4.7K / 0.25W R8, R19 – 4.7K / 0.5K R2, R5, R21, R23 – 56K / 0.125W C7, C17 – 3pF ceramic C2, C20 – 470pF ceramic 50V C6, C16 – 1nF 100V C11, C12 – 100nF 100V C1, C19 – 2.2uF 50V C5, C15 – 1uF 63V C4, C10, C13 – 10uF 63V C9, C14 – 47uF 63V C8, C18 – 100uF 16V source [link]