hi all,
first post here at atari age. i've been an atari addict since 1978, and have collected off and on since that time. my two cents on this topic:
do not leave your atari plugged in all the time. i have had 2 power supplies fail thru the years from being left plugged in. one was the very first ps for our first atari in 1979, the other was lent to my girlfriend's brother in the mid-90's, and even after i asked him to not leave it plugged in he did just that - and sure enough i got back a dead power supply. my understanding is if the unit gets too hot it will trigger a circuit breaker like effect and kill the psu.
just my experience - yours may differ, but i figure why take the chance?
thanks!