You might want to replace the bridge rectifier in that new 35A power supply.
Yep, right out of the box. At some point, Astron started shipping RS-35A's with a 25A bridge rectifier. They paralleled two out of four of the 25A diodes twice over to make, supposedly, a pair of 50A diodes for center-tapped full-wave rectification. That's not good engineering practice as the diodes in each pair will not share current equally because of differences in Vf and tempco. Once one blow, the other will blow shortly after. After I fixed my own RS-35A with this problem, I've helped several other hams fix this same problem in theirs. Not a random sample, as this is just folks on my local machine and in local clubs. You can get a 50A bridge in the same package for under $3. Perhaps Astron has fixed the problem since .... 73 de AI6KG -ch On Thu, Apr 16, 2020 at 10:28 AM Ray Albers <rayalb...@gmail.com> wrote: > Many to all who posted/responded to my recent post about an electrolytic > capacitor failure in my power supply. Lots of very interesting reading > about peoples' industry experiences - thank you! > > Several have pointed out that using a 20A supply with my K3/100 is pushing > close to (or over!) the limit. Even though I am measuring just 16A at the > power level I'm running (and not running anything but the K3 on this > supply) I agree that I'm skirting the edges. So even though I've been > getting away with it for a long time, this morning I ordered a 35A supply. > I'll probably sleep better. > > 73 > Ray K2HYD > > < > https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=icon > > > Virus-free. > www.avast.com > < > https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=link > > > <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to c...@murgatroid.com > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
