Welcome Gilbert, excellent resources in the above post.
Your question is very general, sort of like "where is a good place to get food?" Ther are collections of schematics online, but in many cases, you can simply contact the amp maker. Peavey for example is famous for customer support, they will send any schematic you want. Of course some companies won;t.
But really it boils down to what are you looking for. You want specific scheematics? Or do you want general ones. Or a sampling.
Education is what you're left with after you have forgotten what you have learned.
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