Stay with SS. Tube gear has high voltages making it a hazard in dusty/wet environments. The other option is to box it in with filtered, forced air ventilation.
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I would want it in a closed cabinet and make sure it does not throw off too much heat. Dust and airborne chemicals will certainly cause issues but the biggest one in my opinion would be the fire HAZARD that fine dust and the amount of it in that environment would risk. I have an old Marantz 2330 b in a closed cabinet in my shop and once a month I take off the metal case and blow it off. Its surprising how much dust still gets inside it. Cheers.