When I read this today it reminded me of a problem that I had with my TenTec 6M transverter. Sometime after TenTec ceased production of that kit, they did another run of them. I picked up one from the last production run, and it performed as advertised. Then out of nowhere the finals failed for no understandable reason. After taking a close look at what remained of the factory supplied finals, 2SC1969's, and checking it out on the internet, I now think the kit came with bogus (fake) final transistors.
I wouldn't begin to suggest this if you hadn't said that it appears that the finals were replaced before you got the radio. Here is a link I found on the subject: http://www.4hamradio.com/counterfeit-mitsubishi-2sc19692sc2312-transistor-test/ Eventually I did find some, well I think they're close enough to the real thing, they work and they take a lot less drive than the old ones did to get the desired output. I would strongly suggest, if you're not already doing this, that you get replacements from Elecraft and not off of an auction site. Ron VE8RT On Sat, 2012-10-13 at 06:08 -0700, w7asa wrote: > Man! You guys are really encouraging-and FAST! > > The K2 has ONLY the SSB option at this time. I am building the ATU, 160, > 60m, and a few more goodies on my bench as we speak. > > --- > >>> I bought this on the internet very recently and have basicaly no > >>> information available from the seller. When I ordered the ATU kit from > >>> Elecraft, I also ordered two K2PAKIT packs just in case, *figuring that > >>> I would never need them* > > I installed all K2PAKIT components, including Q11 & Q13, and the 1.5 Ohm > resistor R50. My bench has a grounded ESD mat and wrist strap and I've made > a career working to IPC610/620 and mil electronics standards. So, I am > really comfortable inside of this radio. > > The general workmanship on the main board was not very good but I am told > that it was functioning for years. After I have it running, I intend to do > a lot of flux removal, reflow & rework to clean it up. However the SSB unit > *is really excellent*: shiney joints, no voids, great fillets... so I knew > that it was built by someone else as soon as I saw it. I found paperwork in > the maual and the EXCELENT SSB board was made by Don Wilhelm! Great Work > Don! Rest assured, I used to do a lot of nit-picky QA & rework for DoD and > even through my magnifiers, your SSB board is really superb work ! ... > small world, eh? (and no, I do not work for Don...) > > Thanks for the settings and reading info. I will do the current, bias > voltage and settings checks as indicated by you guys and thanks for the > direction. I am brand new to the K2. My next two replacement parts kits are > ETA next week, so I have plenty of time to snoop, measure, poke & prod until > then, but I'll go straight for the settings - being the low hanging fruit. > > > Thank You & I'll keep you posted - > > > 73 de Ray > W7ASA ..._ ._ > > > > > > -- > View this message in context: > http://elecraft.365791.n2.nabble.com/K2-Finals-Chronic-Blow-Outs-tp7564052p7564055.html > Sent from the Elecraft mailing list archive at Nabble.com. > ______________________________________________________________ > 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 ______________________________________________________________ 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
