Normally high 50's to low 60's in a rag chew. During a CW contest running stations, it sits around 65C more or less.
On Sun, May 3, 2020 at 5:53 PM Dave Cole <[email protected]> wrote: > I hope others chime in with the operating temps they routinely see... > This is a very useful discussion. > > 73, and thanks, > Dave (NK7Z) > https://www.nk7z.net > ARRL Volunteer Examiner > ARRL Technical Specialist > ARRL Asst. Director, NW Division, Technical Resources > > On 5/3/20 3:47 PM, Ted Edwards W3TB wrote: > > I am glad to see these numbers and comments, because I have wondered > > about the temperatures. If running on CW in contests, it shows upper > > 50s and reaches 60C. > > > > Thanks gang! > > > > On Sun, May 3, 2020 at 17:42 Dave Cole <[email protected] > > <mailto:[email protected]>> wrote: > > > > Pure paranoia! :) > > > > I tend to creep into things I consider limits, and not race to > them. I > > normally run the amp in such a way that it never exceeds 60 or at > worst > > 65 C. Seeing it hit 70 makes me nervous... > > > > So... > > > > Prior to any excursions in to the above 70C area I need to learn > more, > > which is what your post just helped me do! Thank you!! > > > > Knowing that others can run the KPA500 90C, eases my fear of amp > final > > damage. > > > > I have always ran tube amps in the past, and at one point owned a > very > > sensitive SS amp, which killed a few sets of finals. > > > > It turns out there were other issues at play, (design issues I > think), > > but that experience made me very jumpy about SS amps. I almost went > > back to tube amps prior to purchasing the KPA500. After owning > KPA500 > > for a while now, I would never go back to tubes... So I am being as > > careful as possible to insure I understand what I am asking the amp > to > > do, before I ask it to do something it was not designed for. > > > > 73, and thanks, > > Dave (NK7Z) > > https://www.nk7z.net > > ARRL Volunteer Examiner > > ARRL Technical Specialist > > ARRL Asst. Director, NW Division, Technical Resources > > > > On 5/3/20 1:36 PM, Jack Brindle wrote: > > > Dave; > > > > > > The KPA500 will protect itself above 90C, but it will work quite > > well at 70C. Why do you stop at 70C? > > > > > > 73! > > > Jack, W6FB > > > > > > > > >> On May 3, 2020, at 1:26 PM, Dave Cole <[email protected] > > <mailto:[email protected]>> wrote: > > >> > > >> Hello, > > >> > > >> I just got the new MMSSTV software, and will be running a bit of > > SSTV. SSTV is 100% duty cycle. > > >> > > >> Initial testing here indicates no power level is safe... At 150 > > watts the KPA500 reaches 70C pretty fast, in under two minutes, and > > 70C is my upper limit for testing... At 500 watts it reaches 70C in > > about the same time... > > >> > > >> Can I assume the amp is not the most efficient thing in the > > world at 200 watts? > > >> > > >> If the KPA500 can't deal with 100% duty cycle, for two minutes, > > how does the K3 deal with 100 watts for two minutes, at 100% duty > cycle? > > >> > > >> -- > > >> 73, and thanks, > > >> Dave (NK7Z) > > >> https://www.nk7z.net > > >> ARRL Volunteer Examiner > > >> ARRL Technical Specialist > > >> ARRL Asst. Director, NW Division, Technical Resources > > >> ______________________________________________________________ > > >> Elecraft mailing list > > >> Home: http://mailman.qth.net/mailman/listinfo/elecraft > > >> Help: http://mailman.qth.net/mmfaq.htm > > >> Post: mailto:[email protected] > > <mailto:[email protected]> > > >> > > >> This list hosted by: http://www.qsl.net > > >> Please help support this email list: > http://www.qsl.net/donate.html > > >> Message delivered to [email protected] <mailto: > [email protected]> > > > > > ______________________________________________________________ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:[email protected] <mailto: > [email protected]> > > > > This list hosted by: http://www.qsl.net > > Please help support this email list: http://www.qsl.net/donate.html > > Message delivered to [email protected] <mailto:[email protected]> > > > > -- > > 73 de Ted Edwards, W3TB and GØPWW > > > > and thinking about operating CW: > > "Do today what others won't, > > so you can do tomorrow what others can't." > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] -- 73 de Chuck, WS1L [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
