Leigh, Elecraft is currently shipping KX1s with the 2SC2166 again. I have built 4 in the last month and all 4 have that transistor.
The thermal pad provides better heat conduction and should not be eliminated if a plastic tab transistor is used - only the shoulder washer is eliminated. 73, Don W3FPR On 2/9/2011 7:21 PM, Leigh L. Klotz Jr WA5ZNU wrote: > Here's some info to read: > http://elecraft.365791.n2.nabble.com/KX1-Q6-question-td662532.html > and here, in this erratum superseded by the revision E manual which shows > the changeover: > http://www.elecraft.com/manual/KX1_Owners_Manual_Errata_Rev_D-1.pdf > > It seems that Elecraft went from a 2SC2166 to a 2SC5739 for RoHS compliance. > > A side benefit is that the new part eliminates a thermal pad, shoulder > washer, and thus a potential for a short from the KX1 build. > > Some have reported improved output on 20M with this part, albeit with the > usual warnings about too much power causing you trouble later if you don't > have a great match to your antenna, a strong possibility under the KX1 > normal operating conditions. > > Leigh/WA5ZNU > ______________________________________________________________ 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
