Just purchased a SN3. Very happy so far and still running it in. After run in, should I power the SN3 off using the power switch in the rear when not in use or just leave it on? Does it go into some sort of standby mode without a source providing an input?
No standby but I leave mine on 24/7 anyway unless thunderstorm or away for a while. 
I do use Disp off mode though to preserve the life of the lights and looks better too.
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Thanks!
I always left my SN 2 and associated Naim gear powered up unless lighting storms passing through or away on holiday.
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I turn mine off every night.
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I have always turned my SN2 and SN3 off when not in use.
My step father was a chief fire officer and every night would always turn every appliance off at the socket and would only switch any electrical appliance on when he wanted to use it - far too many house fires caused by electrical appliances in his experience.
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It is partly a myth that Naim equipment must be powered at all times. Sure, it takes a while after start-up before it sounds its best again, but we’re talking minutes, not hours, and by turning it off when you’re not using it, you both save power, but above all, you extend the life of the amplifier.
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The big electrolytic caps are under the most stress during power-up. I leave mine on 24/7, but I’ve got a massive 5.2kVA Isolation transformer that feeds a Furman Elite 20 PFi.
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Since my house twinkle when I turn on my naim rig it to me means that spike is worse for the capacitors than leaving it on. That’s what most say too specifically regarding capacitors. Leave ‘em on if you don’t live where the amp is exposed to high room temperature.
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A lot have happened since to prevent such but I agree that if you are away for longer periods I’d turn off and same goes for products not CE marked (UKCA) or other cheap no name electronics bought directly from far east.
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The life of capacitors is shortened if they are constantly current, even Naim’s. But we can disagree on that point Slamdam 
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