Posted by Garf on December 22, 2001 at 00:01:58:
  My brass quintet is going carolling sunday evening and it's going to be about 30 degrees.  Last year I played a piston valved tuba, and it did alright, but the horn player seemed to have some problem with his valves freezing.  This year I've got a Miraphone 188.  What I'd like to know is how does the could affect rotary valves, and if it freezes them, can it be prevented by wrapping them up? 
thanks