Hi - I am using Primary A34.2 class D amps, Parasound P5 pre amp and Mytek Brooklyn DAC with a dedicated power supply. When I was overseas I used to leave them powered on all the time. On returning to India I get scared to leave them on - though there are so many recommendations about leaving them on. I have been switching them off due to the unstable and unclean power here. But every time I power them down and up and listen to the relays clicking and visualise the electrons surging through their circuits my heart skips a beat wondering when something will blow. I am using spike buster strips but not sure how much they help. I know this On / Off is a perennial debate and my temptation is to leave them on - after all class D uses very little power in idle mode and a DAC is essentially a computer and I leave my Mac minis on all the time. Happy to get thoughts on other people's experiences and help me rid this dilemma every night - switch off or leave on! Thanks friends.