[Elecraft] KPA-1500 failed!

[lists at w2irt.net]

Exact same thing happened to my K3s in October, now my KPA-1500. Yeah, So
done here. Once repaired and confirmed working it will be up for sale. Going
back to a tube amp after this. 

 - pjd

-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On
Behalf Of Paul Baldock
Sent: Saturday, February 16, 2019 10:28 AM
To: rocketnj at gmail.com; elecraft at mailman.qth.net
Subject: Re: [Elecraft] KPA-1500 failed!

It sounds like one of the output devices have failed. Half power out is
usually the indicator. A number here have reported this happening. 
It would be nice to know why this problem is occurring and if Elecraft are
working on a fix.

- Paul

At 07:10 AM 2/16/2019, rocketnj at gmail.com wrote:
>I talked to Peter on the phone. He has no bias current when amp is 
>transmitting with no power applied (key on SSB without talking. He is 
>reading 54 volts and has tried power cycling amp from power supply 
>switch and reseated all cables. Definitely BAD distortion on SSB (we 
>are close enough to hear each other). Looks like one RF device let 
>loose and it is dragging down the bias voltage. That is my guess.
>
>Dave wo2x
>
>
>-----Original Message-----
>From: elecraft-bounces at mailman.qth.net 
><elecraft-bounces at mailman.qth.net> On Behalf Of Wes
>Sent: Saturday, February 16, 2019 9:49 AM
>To: elecraft at mailman.qth.net
>Subject: Re: [Elecraft] KPA-1500 failed!
>
>I think a two-tone test is the best evaluation tool..  The generator is 
>built into the K3 if you have another receiver that you can use to 
>listen to the amp output.  I use an SDR-IQ which is a very nice tool 
>for this but any other SDR would do.
>
>Sorry for your pain.
>
>Wes  N7WS
>
>On 2/16/2019 7:28 AM, lists at w2irt.net wrote:
> > I was operating in the ARRL-CW contest this morning and on 20m, with 
> > a
> > 1.2:1 SWR on the Yagi, all of a sudden I saw my power drop to about 
> > 450-500W with about 40W in. Worked a few stations but not as easily 
> > as when I turned everything on this morning. Switched over to phone
> and made a few contacts.
> > Audio is fine barefoot with 100W out of the K3s-which suffered blown 
> > finals itself during CQWW SSB last fall, but with the amp in I got 
> > reports that my audio was badly distorted.
> >
> > Before I send it in, is there anything I should look at or any 
> > diagnostics I can easily perform? For the cost of this, I'd have 
> > thought protection would have kicked in to prevent anything untoward 
> > from happening. I'm in complete disbelief, to be honest.
> >
> > ---------------------------------------------
> > 73 and Good DX
> > Peter, W2IRT
> >
>
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