So my all tube guitar amp is acting a little funny. I don't think it likes being pushed in a 50 degree room. I have it setup in our shop /storage area and when I push the tubes it drops in volume and I hear the tubes making clink noises. Is it the weather? Is it bad to push a tube amp in 50 degree F or colder rooms? I know tubes are thermionic and all that jazz, so I'm going to assume this is the reason it's doing that.