Thank you folks for clarification. I have always left my SS gear on 24/7. It's good to know (thank you Raquel) that I actually benefit from doing it with tubes (at least in a preamp or CD player). I am considering some incarnation of a Conrad-Johnson preamp. Armed with new info, I may take the plunge. Once again, you Goners are the best sources of information out there! Thanks,
Tom
Tom