Apple III Power Supply: Success (I think...)

Thanks again to everyone offering suggestions for fixing my Apple III's power supply. I opted to do a wholesale replacement of the electrolytics in the power supply, since I was likely going to be removing all of them to test them anyway and there's only a handful to take care of. $9 worth of parts later, the issue seems to be resolved -- the system powers up and runs diagnostics. (Though it keeps cycling, so I don't know yet if that's another problem or normal behavior :)). The only thing I have noticed is that there's a very noticeable "hiss" noise coming from the power supply -- not sure where, exactly. Any ideas if this is normal? At the moment I have only the motherboard & 256k RAM expansion running (no keyboard or floppy drive.) Thanks again! Josh