Re[3]: HV transformers

Thanks for the explanation!

John :-#)#

At 01:25 AM 9/19/00, peter jones wrote:

>-----Original Message-----
>From: John Robertson <jrr@flippers.com>
>To: vectorlist@synthcom.com
>Date: Sun, 17 Sep 2000 16:02:39 -0700
>Subject: Re[2]: VECTOR: HV transformers
>
> > At 01:38 PM 9/17/00, peter jones wrote:
> >
> > >...
> > >
> > >also be VERY suspicious of MYLAR capacitors.
> > >DU-PONT dont like people saying this - but mylar can-never be made
> without
> > >defects. they where ok for there time, but i replace them with
> polyester now.
> >
> > Does this mean I need to break out my 70's leisure suit to fix monitors
> > now? I think it is polyester.
> >
> > Perhaps you meant polypropylene?
> >
> > John :-#)#
> >
>
>ha-ha good one!
>if i get out my 70's polyester stuff it would be my pram-cover!!!
>
>anyway getting serious.
>I repair a lot of switching power-supplys for satellite receivers.
>this has shown-up the problem with mylar caps.
>
>and no. - i dont mean polyprop' caps, i mean multi-layer metalised
>polyester-film.
>
>(the little 3x8mm plastic boxes usually yellow) :)
>
>mylar caps dont like hi-current pulses. the cavitys in the aluminium
>vapour-layer cause heating between the layers and the cap expands and goes
>dark-green to brown in colour, sometimes cracking the resin in the proccess.
>
>MYLAR - DONT TRUST THEM!!!!!!!!!!
>
>
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Received on Tue Sep 19 11:42:03 2000