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the old marshall 9000 series single-space tube preamp (for guitars) is very good for this purpose. they can be had pretty cheaply on ebay, and if you play guitar, they're wonderfully versatile for that purpose too.
i use the tube instrument input in the drawmer 1969 for all my synth tracks which call for distortion anymore. it's probably well out of your price range and beyond your stated needs, but it does hella nice things to my VA synths.
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