Pop sound when switching on / off Pass Aleph 30?

My Aleph 30 has been doing that since I bought it. No problem.

Some power amps don't have muting circuits and when powered off it is possible for them to continue play music for a few seconds until their power supplies completely discharge. (Maybe you notice this with the Aleph 30). Amps of this design are more likely to introduce pops & clicks when turned on or off but the advantage & logic of this design is there is no sound-degrading muting relays/circuitry in the signal path.