KPA500 Problem

[Elecraft mailing list]

I have a KPA500 with a low HV reading. It is on the center tap and AC voltage is 115v No load and 110v full load. The HV goes from 77v NL to 56v FL (500W output)      Is that something I should look into?    Doug K6JEY


 
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[Roy Koeppe]

Could a rectifier diode have gone open (as in it's now a half-wave circuit)?
If so the filter caps are at 60 Hz. Just a thought...

Roy    K6XK


I have a KPA500 with a low HV reading. It is on the center tap and AC
voltage is 115v No load and 110v full load. The HV goes from 77v NL to 56v
FL (500W output)      Is that something I should look into?    Doug K6JEY





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[ke9uw]

Is that something new? I’m not too surprised running it on 115 and starting at 77.
I’m on 240 dedicated circuit and starting at 82 v which loads to about 67v. I’m doubting that there is any hard fault.

Chuck Jack Hawley
KE9UW

Sent from my iPhone, cjack

> On Jul 6, 2019, at 1:44 PM, Roy Koeppe <[hidden email]> wrote:
>
> Could a rectifier diode have gone open (as in it's now a half-wave circuit)? If so the filter caps are at 60 Hz. Just a thought...
>
> Roy    K6XK
>
>
> I have a KPA500 with a low HV reading. It is on the center tap and AC voltage is 115v No load and 110v full load. The HV goes from 77v NL to 56v FL (500W output)      Is that something I should look into?    Doug K6JEY
>
>
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

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