In general, tube equipment does not smell much at all. There may be dust on tubes haven't been run in a while, and that may give a slight burnt smell when the tubes heat up to running temperature, and even if that's cleaned off, there may be a very slight smell at operating temperature, but nothing you would NOTICE as smelling, unless there was something faulty and overheating.
But I did see this thread recently on tube equipment that smells:
http://www.diyaudio.com/forums/tubes-valves/174608-do-you-own-chinese-tube-integrate-does-smell.html
But I did see this thread recently on tube equipment that smells:
http://www.diyaudio.com/forums/tubes-valves/174608-do-you-own-chinese-tube-integrate-does-smell.html