Hi Folks, My new to me Astron RS70A power supply arrived today, what a brute.... I did not a manual with it and can anyone tell me if the fan is supposed to run all the time or only when it needs to? Oh yes, it is only running Icom's, no brand Y or K hi hi. Thanks William J. Diamond Rogers, Arkansas Ham Radio Operator WR0T Please Visit My Radio Site wjdiamond.com