Check the archives, this topic has been covered many, many times. The general consensus is that you should leave it on 24/7, except durning a thunderstorm.
My suggestion is to turn power amps off when not in use for long periods of time say overnight this includes tubed pre-amps. Solid State Pre-amps and CD players are ok to leave on 24/7. You should ask the manufacturer of your power amp what they suggest. My suggestion is covered on the Conrad Johnson web-site and is their recommendation as well.
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