[Elecraft] About my capacitor failure (etc.) issue:

[Adrian]

When you say 'blow' are you saying it short circuits internally or open 
circuits internally due to the event      ?


Adrian Fewster

On 20/4/20 8:07 am, Christopher Hoover wrote:
> 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 <rayalbers at 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
>>
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