Bud, Check the errata sheet that came with your kit, the changes to the 2SC5739 at Q6 are explained there. Yes, it is OK to use. The thermal pads are normally in the Serial Number envelope - open it and check. The thermal pad assists heat transfer from the pad to the mounting surface (in the case of Q6 that is the board ground plane), so the thermal pads are still required. If you do not have them, an email to [email protected] with a brief explanation should get them in the mail to you.
73, Don W3FPR [email protected] wrote: > I am close to finishing building a K1 and am presently about to install the > two T-220 power transistors, Q6 and Q7. > The K1 assembly instructions indicate that Q6 (transmit driver) is a 2SC2166 > and is labeled C-2166. My T-220 package is labeled C-5739. Is it OK to use > the transistor that came with my kit? Are they electrically the same? > Also, according to the instructions (pg. 43), I am suppose to mount a > "self-adhesive thermal pad" under Q6 and Q7. > I did not receive any thermal pads with my kit. As Q6 is a plastic T-220 > package, I don't understand why I need a thermal pad under it. Thanks in > advance for any help/suggestions. > > > ______________________________________________________________ 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
