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-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net> On Behalf Of Paul Baldock Sent: Saturday, February 16, 2019 10:28 AM To: rocke...@gmail.com; elecraft@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, rocke...@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-boun...@mailman.qth.net ><elecraft-boun...@mailman.qth.net> On Behalf Of Wes >Sent: Saturday, February 16, 2019 9:49 AM >To: elecraft@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, li...@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 > > > >______________________________________________________________ >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 >rocke...@gmail.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 >p...@paulbaldock.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 li...@w2irt.net ______________________________________________________________ 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
