Leave them on...most decent Class A amps are designed with this in mind...if you have reservations....and want to turn them off...give them 10-15 minutes of "warm UP" when turning back on...and dont stack other componets on top!
If you have the old MF A1...you can make some chicken fajitas while listening to Mahler..awesome!
If you have the old MF A1...you can make some chicken fajitas while listening to Mahler..awesome!