I have a pile of Apple IIe's I'm refurbishing, and I just ordered a bunch of cap kits from Console5 to recap the power supplies, most of which are the Astec AA11040B style. Iniitally, I discovered all but one worked properly, so I was a bit surprised to see varying behavior when I started the recap process. Specifically, several would provide the +/-5V and +/-12V outputs when powered on. Others simply made a repeated ticking sound, a symptom I've come to understand is often a capacitor issue - such was the case when I worked through a few IBM power supplies.
Then I duscovered that the ones that tick apparently need to be loaded to provide output.
My confusion is, I see no significant difference between one that ticks and one that does not - there's no obvious model / revision numbers anywhere to indicate a difference, the boards are often identical.
Is there a telltale way to determine if one of these power supplies needs to be loaded, or if the ticking is an indication of failure (apart from plugging it in to a motherboard, of course)?