Ted, If the people at Elecraft have done their job and mounted the transistor properly with the correct torque on the mounting hardware procedure, no additional maintainance is required. I have been in the industry for a LONG time . Three things to remember in the mounting of any RF or high power device. Flat surfaces, minimual mating gu, and required torque. Lack of any of these will kill a device if not correct. I have never required retorqueing parts, with one exception. In 000 copper wire terminals, the copper does relax and needs to be retorqued to achieve a gas tight seal connection, but that is in industrial application. Small RF devices only need the initial torque to be correct.
Mel, K6KBE From: Cameron Francey <cameronfranceyut...@hotmail.com> To: "Dauer, Edward" <eda...@law.du.edu>; "elecraft@mailman.qth.net" <elecraft@mailman.qth.net> Sent: Saturday, October 28, 2017 12:10 PM Subject: Re: [Elecraft] PA Transistors Maintenance in K2 A nice tip which I use when looking for anything in any sort of .pdf manual, Elecraft included as I have accumulated quite a number of them over time is to use the search feature on the .pdf reader. Ctrl+f on WIndows and cmd+f on Mac and type what I'm looking for. The index and contents tables are good, but obviously can't have everything in them, so I use the find feature a lot. Hope this helps. Regards, Cameron - AF7DK/GM7LQR ________________________________ From: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net> on behalf of Dauer, Edward <eda...@law.du.edu> Sent: Friday, October 27, 2017 8:15 PM To: elecraft@mailman.qth.net Subject: [Elecraft] PA Transistors Maintenance in K2 I vaguely remember reading somewhere that after some number of hours of operation – maybe 50 – the hardware holding Q7 and Q8 onto the heat sink should be tightened, I presume to maintain good heat conduction from the tabs to the sink. But I can’t find that instruction in the manual now. Anyone know where I might have gotten that notion, or did I just make it up? Thanks, Ted, KN1CBR ______________________________________________________________ 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 cameronfranceyut...@hotmail.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 farrerfo...@yahoo.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 arch...@mail-archive.com