I forget what LCD stands for but given your price range and the type of sound you are looking for, I would go with a vintage amp. Something like a heathkit or dynaco should do a great job for your needs.
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Sorry if I made a mistake, but if we are talking about a headphone amp and not a regular poweramp for speakers, my recommendation, of course, is not correct. Either way, $500 is a very low budget for what you are asking and any modern design will most likely, not aim for a very dark, classic sound, but something more flat. If you can't find anything you like, the next best thing may be an EQ. Not a perfect solution, but it may help.