Punch 200ix

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Hello everyone.

I have a punch 200ix that had a fried power supply and a channel with 2 shorted outputs. I repaired the power supply and the channel.

The amp plays great and sounds great for hours on the bench with no issues.............but

When you power up the amp with no RCA signal it draws current and the repaired channels starts to get warm, especially R157.

Why would the amp be fine with a signal hooked up and not fine without a signal hooked up?
 
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