Hello John, I built quite a number of K2 in the past. The PA of K2 is fairly tough. It is nothing demanding for that pair of PA transistors for an output of merely 10-15W.
I don't think it is a good idea to build external PA board. I do suggest you take a digital photo of the PCB section related to the PA. Then send your photo to [email protected] and seek their advice. K2 is a very mature product and all the production bugs have been overcome. Elecraft knows it inside out and can give you all the required support. The beauty of Elecraft product is that most of the repair can be done on the field and without the trouble of sending back for repair. You may wish to take this chance to investigate why the PA of your K2 keeps on failing. It is a very unusual circumstances. cheers, Johnny VR2XMC ________________________________ 寄件人﹕ john petters <[email protected]> 收件人﹕ Elecraft <[email protected]> 傳送日期﹕ 2011/2/17 (四) 4:15:25 AM 主題： Re: [Elecraft] K2 PA Failure ------- Hi Folks, I have had another PA transistor failure in my 2003 vintage K2. The transistors have been replaced several times over the years and the board is now a mess. I'm planning to rebuild the PA on an external board with a proper heat sink mounted on the back panel of the K2. This will involve taking the secondary from the driver transformer on a piece of coax about 6 inches long. My query is what impedance is the secondary of T2 designed to work into and will I have a problem taking this to the external board? I've never liked the design of the mechanical fitting of the K2 PA and always regarded this as the Achilles Heel of the rig. Suggestions appreciated. 73 -- John Petters www.traditional-jazz.com Amateur Radio Station G3YPZ ______________________________________________________________ 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
