Re: Jet AFS-1000B Air Cleaner

My JET AFS-500B (looks like the same board as the 1000B) was making grumbling noises on startup and not really getting up to speed so initially I assumed that the bearings in the fan had dried up (it's about 16 years old), but on giving the rotor a spin by hand it ran for ages with no mechanical noise, so I had a search and arrived here.

I've been familiar with ESR problems for many years - when I first fixed power supplies with high ESR capacitors it was just like magic! I had a Bob Parker ESR meter and more recently have been using a...