Why Preamps Thump on Turn on

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

Interesting ...

I have an old NAD 7220PE coupled with Spectrum 208A speakers that I acquired for dorm life way back.  Powering up would also produce a rolling 50hz burp ... 

Have a Holman APT pre coupled with Odyssey Kismet amp, which are dead-silent.

Kind of miss the burp ...