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I should wait for 15 minutes before I turn them back on to avoid damaging the amps or tubes.
On my ARC tube amp I wait at least 5 minutes. YMMV.
Turning off a power amp is not a problem. Turning it back on too soon after shutdown can do harm to the amp or possibly your speakers.
The main reason you should wait a reasonable time before powering back up a power amp is to allow the electrolytic caps in the power supply to discharge. Failure to do so could damage the power supply or possibly damage your speakers from a loud transient spike thump.
If you have ever experienced a loss of mains AC power caused by the Utility Power Company for 10 or 15 seconds and then come back on you more than likely have experienced the loud thump sound through your speakers.
I recall that Kal at ARC gave me the same advice as jea48 just posted, ... wait 5 minutes. Kal said the reason for the wait is to let the PS caps to discharge. Having said that, my memory is fading and I suggest that if this is a real concern, call Kal and get the advice directly from the source.
Also, other manufacturers may offer different advice for their gear, be it tube or solid state. While this is a good forum to raise the question, the best place to get the answer is the manufacturer. IMHO.
Stupid Post IMO!
Turn on the tube equipment 15 minutes before listening to warm up.
Shut off after you are done listening.
Do not turn off, and then quickly turn back on, tube equipment.
Do you only listen for less than an hour at a time?
A:B testing requires the equipment to be "FULLY WARMED UP" for accurate results.
Short time A:B testing is worthless, and will tell you nothing.
It takes more listening time to fully evaluate, the complexity, of sound quality.