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A Gainclone chip amp makes for a nice benchmark/monitor amp. How can I add controllable even order harmonic distortion to one?

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It really depends on what you want to actually do with it. If you reword the question to be a little more pointed I think we could possible give some guidance. It's a bit like asking "Is there any sense in painting my lawnmower pink?" ;) – Jduv Jul 2 '12 at 17:44
I've revised the question. – Rob Kam Jul 2 '12 at 17:56
Good question, but certainly better suited for electronics.SE. – leftaroundabout Jul 3 '12 at 0:47
Use a modeler like the Boss GT-10, Digitech RP500 or the Vox Tonelab to get a decent tube sound. – JimR Jul 3 '12 at 17:45
Completely on-topic. What's with all the close votes? – American Luke Oct 3 '12 at 21:59

The simple answer is that you can't. The reason these are so cheap and simple is that there aren't a lot of configurable parts and sadly you are stuck with odd harmonics if you overdrive the LM 3886.

As JimR said, you'll need to use a valve overdrive in your signal path if you do want that sound.

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