What is turn on/off sequence of amp and pre-amp?

What is the proper turn on/off sequence of source, pre-amp and power amp? One time I got a pop sound from the speaker when I turn on the source first, then power amp and finally pre-amp.
Turn amp on last. Turn amp off first
What he said.
Always turn the preamp on first. Some tube preamps take a while to stabilize. If you own a tube preamp and your preamp does not auto mute turn the preamp on and wait a few minutes before turning the power amp on.
ON: source/preamp/amp; OFF: amp/preamp/source. You can find a new thread on this topic on the Naim forum every couple of weeks!