Yes. But I believe that is Junction temperature, not case on heatsink temp. Remember the case bottom is heatsink for those. Make sure screws are tight.
Sent from my iPhone ...nr4c. bill > On Oct 27, 2017, at 12:19 PM, N2TK, Tony <[email protected]> wrote: > > 50C is not hot for a transistor. Commercial transistors are usually speced to > 85C. JANS (space) transistors are speced to 125C and actually baked without > bias for 320 hours at 200C. The hFE is measured before and after to check for > change. > 73 > N2TK, Tony > > Sent from my iPad > >> On Oct 24, 2017, at 8:23 PM, Don Wilhelm <[email protected]> wrote: >> >> Nick, >> >> Yes, I believe that should be no problem. >> >> 73, >> Don W3FPR >> >>> On 10/24/2017 8:57 PM, Nick - VE3EY wrote: >>> Hi Don >>> >>> Good question. I happen to have a Infrared Thermometer. After bashing >>> at it for about 20 minutes, the temperature in the vicinity of two >>> transistors (as measured against the bottom cover) peaked at 50 degrees >>> Celsius (122 F) but it did not go beyond that. I ran the rig at 10 watts >>> on 10 meters which is where most of the drive power is needed. >>> >>> I suppose that should be OK than. >>> >>> 73 and thanks for your feedback, >>> >> >> ______________________________________________________________ >> 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]
