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How to make a 100W amplifier and power amp and a booster expandable in power up to 300W. Recommendations, 33v + 33v AC transformer, a 4 ohm speaker and two 8 ohm speakers maximum. 100W power amp video: • How to Make a 100W Power Amp... 100W to 300W expandable booster video: • 100W Power Expandable Amplifier...