Heathkit Ar-15 one channel weak

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ar15guy

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Joined 2008
Hello,
I have a Heathkit AR-15 with a weak channel. On a scope, using a sine wave input, the output shows a square wave with sharp peaks at the edges on top and bottom. The unit worked when it was put in storage for 10 years. I have replace caps and transistors with NTE substitutes for lack of others. Any clues?
Thank you.
 
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