Why Preamps Thump on Turn on

I turn on my McIntosh preamp and it then turns on my Mac power amp and Mac tuner,  No thumps or pops in my system.

Um.....

This happens with asr amir too - in his rush to have a reply for everything in making response to anything, he too never reads first much, in then making an answer to an entirely different issue of his own manufacture. 😆

When turning on  digital I always leave on , 

then preamp ,then amplifier,

when shutting off , Amplifier then preamp, in that order is the correct way.

that thump is DC still on the line,  do you have a tube preamp ?

if so follow this sequence.

There are some amps that get an inrush of power and cause a thump some people developed relays as a solution to this.my old carvers are an example and aftermarket has a no thump circuit  for this