KPA500 dead?

[Steve Lund]

It appears that my KPA500 has failed. It has a permanent "PA DISS" on all
bands. Just before that fault it smelt like wire insulation was burning (no
smoke). It has this condition on 160 - 6m. The fans seem to be running fine
and the PA temp was 50C. I've run the KPA500 on JT65/MSK144/FT8 for over a
month on 6m without a problem.

I was using the amp on 6m with 400w out (about all I can get on that band
with 110vac). I had just finished a QSO on FT8. I can only get about 50w
out before the "PA DISS" occurs.

I've opened the top cover and see no obvious damage. Are there any other
checks before sending it back to Elecraft?

Thanks,
Steve, K6UM
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[Jack Brindle-2]

Steve;

It is 4:40 on a Friday. If you haven’t done so already, call Customer Support NOW!

This is not good. My suspicion is circuitry on the PA sandwich, possibly the input
network.

- Jack, W6FB
Elecraft Engineering

> On Jul 28, 2017, at 3:25 PM, Steve Lund <[hidden email]> wrote:
>
> It appears that my KPA500 has failed. It has a permanent "PA DISS" on all
> bands. Just before that fault it smelt like wire insulation was burning (no
> smoke). It has this condition on 160 - 6m. The fans seem to be running fine
> and the PA temp was 50C. I've run the KPA500 on JT65/MSK144/FT8 for over a
> month on 6m without a problem.
>
> I was using the amp on 6m with 400w out (about all I can get on that band
> with 110vac). I had just finished a QSO on FT8. I can only get about 50w
> out before the "PA DISS" occurs.
>
> I've opened the top cover and see no obvious damage. Are there any other
> checks before sending it back to Elecraft?
>
> Thanks,
> Steve, K6UM
> ______________________________________________________________
> 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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