I can confirm that KPA500 V1.00 firmware, which was the first released, had a max temperature of 90 degrees C. This has not been changed in any subsequent code.
As for the input power, the amplifier has improved over time. My original prototype KPA500 requires power in the range described (about 35 - 40 watts), while my new one (just over a year old) needs about 20 or so watts. Both are great amps! 73! Jack, W6FB > On Jul 8, 2020, at 1:00 PM, William Hammond via Elecraft > <[email protected]> wrote: > > Hi Eric, My manual (revision B, 2011) that came with my SN 0149 says 90C > maximum, page14 in the specifications. It also says drive power 30-40 watts > for 500 out and I have never beed even close to that, usually 22-26 watts > drive. > > FYI, > Bill-AK5X > >> On Jul 8, 2020, at 6:00 AM, Eric Norris <[email protected]> wrote: >> >> I just read in the current KPA500 Manual that max heat sink temp is 90C. >> Is this true for my first-year production KPA500? I seem to remember >> somethink like 75C. I cant find my old manual. >> >> 73 Eric WD6DBM >> ______________________________________________________________ >> 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] > > ______________________________________________________________ > 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] ______________________________________________________________ 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]
