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Yorkville Powermax 22

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My Yorkville Powermax 22 channel is the backbone of the band. Last week after hooking everyhting up. I had no sound from amp A which we use for mains,stage right. Everything else worked fine. EXCEPT the yellow pilot light for amp A was on full. It is just left of the main power pilot light in the top right of the mixer. I suspect shorted output transistor/s. Anyone want to offer an opinion ? I have done some electronic repair like replacing power amp transistors and rectifier diodes, but I am no expert. 

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