Help JC Power 2500.1

I'm not sure what you're trying to clarify in #19. Is it simply that it's a C suffix?

The LMx11 always goes in the location where pins 1 and 4 are directly connected.

Pin 1 of the TL072 is the output but I'd expect it to swing more square. Have you already replaced it?

Is it distorted at a lower output level?
 
at least this is how it looks in the output terminals
 

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