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N_Cook N_Cook is offline
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Default 250W amp - Mark Bass , Little Mark 250, of 2008, Italy

I now see someone else has been here before and ground off IC5

music-electronics-forum.com/t10881/

What is the difference between IR2153 and IR21531?
The original has a diode between Vcc and VB so perhaps whether 2153 or 21531
or any other IR it should be the D variant or adding a high voltage diode
externally