On Sun, Jul 30, 2017 at 8:17 PM, Jules Richardson via cctalk <cctalk@classiccmp.org> wrote:
>> The former are the ones that normally fail, but I would change the lot. > > > I'd be inclined to agree in the case of any class X/Y caps as they're a > known failure point in any piece of vintage equipment... but not every > single cap in the PSU. I know that's not what you're suggesting, but there > seems to be a trend amongst collectors to blindly replace every cap in sight > as part of some "refurbishment process" these days, whether they're good or > bad. Personally I like to keep my systems as original as possible, which > generally precludes replacing perfectly-good vintage components with > perfectly-good modern ones :-) Yes, I was not clear. I don't believe in replacing perfectly good capacitors either, and in my experience capacitors (at least not in classic computers) do not fail as often as some people will have you believe. I meant to say to replace all the capacitors in the mains filter circuit. There will probably be a bfilar-wound filter coil (which doesn't need replacing). On one side of it (electrically) will be a class X capacitor between live and neutral and a pair of class Ys from each of those line to earth. On the other side of the filter coil expect at least the class X between live and neutral maybe more class Ys to ground. I would replace all those. And nothing else unless you know there's a fault. Thinking about it, the ACW has a built-in Microvitec monitor with its own SMPSU (on the monitor board). That probably has its own mains filter componets which I'd probably replace while I was in there. -tony
