I'm getting mixed opinions about how to make the life of tubes in mics, amps, comps etc as long as possible. Should I for example turn off my vintage Neumann when taking a break or should I leave it on ? Does turning on/off the gear all the time wear out the tube more than leaving it on ? Since I have vintage mics and amps with tubes that are getting increasingly expensive and hard to find, I wanna treat them with proper respect. Thanx for input on this.