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Are these vibrations... normal?

My cab is too narrow; my head lays flat across the top of it, with the rubber feet swinging inches off the edge (of the cab).

I would imagine that these rubber casters are engineered to dampen vibrations - sort of like shock absorbers.

Am I hurting my head by bypassing the rubber technology?
 
I doubt your hurting it any. If the head was built to be roadworthy enough to stand the occasional drop being hit and the likes of a gigging musician the vibrations I doubt hurt it any.

A tube amp might be more susceptible to these vibrations but they make tube combos where the cab and amp are joined as one so again, I bet your amp is fine.
 
They also make combo tube amps shock mounted. A little vibration won't hurt it most likely, but if it's excessive it will. And anyone who's ever set a drink on top of a loud cab knows how excessive the vibrations can get. I'd at least lay some 1/2" or thicker foam on top of the cab so the bottom of the amp doesn't come in direct contact.
 
They also make combo tube amps shock mounted. A little vibration won't hurt it most likely, but if it's excessive it will. And anyone who's ever set a drink on top of a loud cab knows how excessive the vibrations can get. I'd at least lay some 1/2" or thicker foam on top of the cab so the bottom of the amp doesn't come in direct contact.

That being said Jimmy is a lot smarter than me in this department. His advice might be worth a little more than mine.