I recently had the chance to get a Haze 15 pretty cheap, and thought, why not. While the clean channel sounds quite good stock, the gain channel just didn't do it for me. Since its architecture is 2203/2204-ish, I modded it that way, but with some taming of the trebliness, and a switch that adds a reasonable amount of gain for a more hi gain-ish sound (not really by nowadays standards). Schem attached, sounds here: Some more infos on the recording on the soundcloud page. I could imagine, that these modifications could sound really good on any 2203/2204-ish amplifier. They're done quite simple and quickly, but to mee sound really good.