> Did I read that the two finals in the KPA500 were push-pull?
That's typical of these designs. The Grandberg design uses the four MRF-150s in parallel/push-pull (two FETs on either side). 73, ... Joe, W4TV > -----Original Message----- > From: guyk...@gmail.com [mailto:guyk...@gmail.com] On Behalf > Of Guy Olinger K2AV > Sent: Tuesday, April 20, 2010 9:06 AM > To: Joe Subich, W4TV > Cc: lrom...@ij.net; Jim Brown; Elecraft > Subject: Re: [Elecraft] : Re: News from Visalia! (:-)) > > > Did I read that the two finals in the KPA500 were push-pull? > > 73, Guy > > On Tue, Apr 20, 2010 at 2:21 AM, Joe Subich, W4TV > <li...@subich.com> wrote: > > > > > >> I'm just stating my opinion that, in the big picture, the > price point > >> for the KPA500 seems a bit on the high side for what you get. Now > >> seeing photos, its certainly better looking than my > ALS600. And the > >> build quality is probably better than my Ameritron > product, but for > >> that power level, and taking into account the value of my > time if I > >> had to build it, the cost is a bit high in my opinion. > > > > Taking this one step further, the KPA-500 may have an > updated design - > > after all the ALS-600 is a close copy of Granberg's 20 year > old design > > (Motorola Engineering Bulletin # 104) - but other than the > > microprocessor control in the KPA-500, the bill of > materials should be > > fairly similar for the KPA-500 and the ALS-600. > > > > The FETs in the KPA-500 will be slightly more expensive (2 x $87 in > > the KPA-500 vs. 4 x $36 in the ALS-600 for Q=1000) but the > differences > > should be offset at least in part by easier assembly and > calibration. > > I would expect the KPA-500 to sell for no more than 20% above the > > street price of the ALS-600 with linear supply. Any more > than that is > > difficult to justify ... after all, a watt is a watt. > > > > 73, > > > > ... Joe Subich, W4TV > > > > > > > > > >> -----Original Message----- > >> From: elecraft-boun...@mailman.qth.net > >> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of > Luis V. Romero > >> Sent: Monday, April 19, 2010 11:51 PM > >> To: 'Jim Brown' > >> Cc: 'Elecraft' > >> Subject: [Elecraft] : Re: News from Visalia! (:-)) > >> > >> > >> I wrote that statement, Jim: > >> > >> I'm just stating my opinion that, in the big picture, the > price point > >> for the KPA500 seems a bit on the high side for what you get. Now > >> seeing photos, its certainly better looking than my > ALS600. And the > >> build quality is probably better than my Ameritron > product, but for > >> that power level, and taking into account the value of my > time if I > >> had to build it, the cost is a bit high in my opinion. > >> > >> I'm not in this to have a pretty shack to impress my friends with > >> lots of lights, gingerbread and ham status symbols. If I > were into > >> that, I would take out a 2nd mortgage and buy a 7800/PW1. :) > >> > >> Maybe I'm "cheap", maybe not. After all, I do own a rather well > >> equipped K3. But with two kids in college and a mortgage > payment in > >> today's economy, what I have does an admirable job. I did > have to do > >> "final QC" on my ALS600, and I did have to integrate a > band decoder > >> to it to switch bands from the radio, and I did have to > install Phil > >> AD5X's marvelous little QSK board, but the K3/ALS600/MFJ998 > >> combination I currently operate does exactly what it needs to > >> do with little fuss and surprisingly high reliability at a > >> very reasonable price point. > >> > >> While its true that you get what you pay for, as I used to > say when I > >> was in TV and purchased EFP cameras instead of the 5 times more > >> expensive studio versions of the same thing for my > station. "Nobody > >> at home can see the difference". > >> > >> It would be nice to have a matching amp and panadapter to > go with my > >> K3. The Panadapter is well priced for what you get, what > it is, and > >> for its computer-less feature set, and I will probably end up with > >> one of those next year. > >> > >> The KPA500, in my personal environment, is not. > >> > >> Again, my opinion, and your mileage will indeed vary. > Matching boxes > >> are not high on my priority list because, well, "You cant hear the > >> difference at home". > >> > >> -lu-w4lt- > >> > >> > >> Date: Mon, 19 Apr 2010 09:59:58 -0700 > >> From: "Jim Brown" <j...@audiosystemsgroup.com> > >> Subject: Re: [Elecraft] News from Visalia! (:-)) > >> To: "Elecraft" <elecraft@mailman.qth.net> > >> Message-ID: <20100419170000.2a58c58...@gw1.nlenet.net> > >> Content-Type: text/plain; charset="us-ascii" > >> > >> On Sun, 18 Apr 2010 16:16:58 -0400, Terry Posey wrote: > >> > >> >ALS600 with the Linear Power supply, AD5X Full Break In > mod and an > >> >external bandswitching accessory plus an MFJ998 would come in > >> >considerably under the $2,000 price. > >> > >> Do I understand that you are equating MFJ with Elecraft? > That's quite > >> a stretch! While I have great respect for W8JI's engineering, > >> that does not > >> extend to MFJ's manufacturing, and Ameritron has common > >> ownership with MFJ. > >> :) > >> > >> I can also buy at least twenty different models of 100 watt HF > >> transceiver for much less than the cost of a K3. Yet I OWN two K3s. > >> > >> I just returned from Visalia. The exhibit hall included > large booths > >> showing Icom and Yaesu rigs. The Elecraft booth was JAMMED > from the > >> minute the doors opened until they closed. The Yaesu and > Icom booths > >> had only > >> modest traffic, and were oftn next to deserted. > >> > >> 73, > >> > >> Jim K9YC > >> > > > > > > ______________________________________________________________ > > 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 > > ______________________________________________________________ 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
