sub woofer and tubes

question for all you audio buffs? i have a fisher x-202-b integrated amp and i just recently hooked my sony self powered sub up to it to see how it sounds. i used the center channel record out rca port. well the question is with my amp running hot with the sub about four feet from the unit will the ultra low vibrations vibrate my hot tubes and damage them? i am really just doing this for fun and will probably take the sub off the system soon and put it back with my surround sound unit. but am i doing harm to my system by exposing those hot hot tubes to ultra low noise. i guess im thinking that when they heat up especially the output tubes are they like a lighbulb filiment and are they fragile. for now its kind of fun but does sound very sloppy.
peace out