All, I thought I should mention that NXP have just announced a new version of the BLF578 1200W 50V LDMOS FET called the BLF578XR (Extremely Rugged) which is claimed to be "indestructible". http://www
Who will be the first to put a pair of these on the air covering 30-6 meters @ legal-limit "brick-on-the-key" output? (((73))) Phil, K5PC All, I thought I should mention that NXP have just announced
I wonder why 10 MHz is the lower limit? 73, Pete N4ZR The World Contest Station Database, updated daily at www.conteststations.com The Reverse Beacon Network at http://reversebeacon.net, blog at reve
And no price .... I would still try it at 160m ... _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
In another NXP video I watched they mentioned 1 MHz. Great transistor. 73 Bert, VE3NR I wonder why 10 MHz is the lower limit? 73, Pete N4ZR The World Contest Station Database, updated daily at www.co
Since most power RF transistors will blow if you even look at them incorrectly, and a tough device adds a lot of value and eliminates some of the required protection devices I'd venture that the pric
They're around $300 or so for the non-XR version these days, I've heard the XR is a couple hundred more .. I'm sure they'll continue to drop in price, they're heavily used in broadcast industry .. de
Perhaps, but part of what keeps an RF vacuum tube price high is the amount of skilled labor required to assemble and test it. Even if the value proposition was zero, the incremental manufacturing cos
I suspect the "device" is ordinary, it is the "built-in protective circuit" that protects it and has that low frequency limit. (tiny torus core) Reflected power reduces drive internally. -- Ron KA4IN
If the device is operated as a class T amplifier, the lower practical frequency limit would be around 40 kilohertz or less. _______________________________________________ Amps mailing list Amps@cont
http://cache.freescale.com/files/rf_if/doc/data_sheet/MRFE6VP61K25H.pdf Freescale's 1.2kw ruggedized part. Youtube has some amusing vids of them being abused too. https://www.youtube.com/watch?v=KZF-
Well, I know a guy who is surely able to destroy even that transistor! ;-) A transistor like this one, packing so much power into a single (and rather small) package, is extremely hard to cool adequ
I made an amp with these Single unit with a single device You can arc weld with it!! 4z4rb Baruch Zilbershatz Nitzanay-Oz 118 Nitzanay -Oz 42836 ISRAEL phone: (+)972-052 8753838 _____________________
Over the years I've heard many people say that adequately cooling a transistor is difficult because it is so small. It's really difficult for me to wrap my brain around that statement though after
The anode cooler is welded to the outside of the anode. The ceramic is just an insulator that isolates the anode from the socket and does not much factor into cooling the tube. I have an 8877 in my h
Well that is exactly my point. I think with power mosfets, the drain is usually part of the outside package. The physical parts of the tube is small, the cooler is just an external part. case and
Now for the big question about the elephant in the room....how much did the device cost you? Phil, K5PC I made an amp with these Single unit with a single device You can arc weld with it!! 4z4rb Baru
Igot 4 devices 2 were 578XR and two had no printing at all on. Got them as samples so I have no idea about price sorry. As far as I can say this device needs cooling. But all that scary talk about su
With an external anode tube (and I'll use the 8877 as an example because I have one close at hand), a plate dissipation of 1500W is spread over the anode. Without the cooler, that's still about 12.5
That penultimate sentence should read the drain LEAD is not an active element. Of course the drain is. But the actual drain where all the electrical action happens is on the silicon. The lead is an e