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21. [Amps] Tubes vs. Solid State (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Thu, 3 May 2012 05:03:06 -0700; - Hams are obviously willing to pay 5000 bucks for an amp, so why destroy the market by making amps that sell for 700 bucks? The intermediate option, making amps that are cheap to make, and then sell; /archives//html/Amps/2012-05/msg00109.html (23,754 bytes)
22. Re: [Amps] Tubes vs. Solid State (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Tue, 01 May 2012 23:11:33 -0400; But what is the price and where do I get them? I still wonder why we aren't seeing them in amps on the market. 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@c; /archives//html/Amps/2012-05/msg00114.html (9,875 bytes)
23. Re: [Amps] Tubes vs. Solid State (score: 1): Author: Bob Henderson <bob@5b4agn.net>; Date: Thu, 3 May 2012 17:22:58 +0000; The BLF578XR is rated for use between 10-500MHz, which is something of a limitation for ham use. A pity because it appears it might be a lot more rugged than the Freescale MRFE6VP61K25H which is rate; /archives//html/Amps/2012-05/msg00121.html (13,382 bytes)
24. Re: [Amps] Tubes vs. Solid State (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Thu, 3 May 2012 13:29:57 -0400; If there wasnt such a big market for cheap amps then Ameritron would have been out of buisness ages ago. The POJ AL-811 series is a huge seller and the AL-80B isnt far behind. The various SS models a; /archives//html/Amps/2012-05/msg00123.html (28,538 bytes)
25. Re: [Amps] Tubes vs. Solid State (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Thu, 03 May 2012 11:41:15 -0600; Bob, Something doesn't sound right here. Even if your amp produced a perfect square wave output, the harmonics of the square wave would be down more than what you saw. The Fourier series of a square; /archives//html/Amps/2012-05/msg00124.html (14,895 bytes)
26. Re: [Amps] Tubes vs. Solid State (score: 1): Author: "Alex Eban" <alexeban@gmail.com>; Date: Thu, 3 May 2012 21:09:42 +0300; You do! Tokyo High Power have one of these based on ARF 1500 transistors. They have a Vds of 600V so that they can operate on mains voltage-rectified and filtered. Now, Microsemi market the ARF 1501A; /archives//html/Amps/2012-05/msg00125.html (11,508 bytes)
27. Re: [Amps] Tubes vs. Solid State (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Thu, 03 May 2012 12:16:22 -0600; Bob, I am currently experimenting with one of the smaller Freescale parts. I do not see any reference to the -7dBc spec in any of the datasheets. On the other hand I have seen the output waveform loo; /archives//html/Amps/2012-05/msg00126.html (19,151 bytes)
28. Re: [Amps] Tubes vs. Solid State (score: 1): Author: Bob Henderson <bob@5b4agn.net>; Date: Thu, 3 May 2012 18:37:06 +0000; _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2012-05/msg00127.html (20,864 bytes)
29. Re: [Amps] Tubes vs. Solid State (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Thu, 03 May 2012 18:20:20 -0400; There's usually more money in high volume, lower price and these new devices look like they lend themselves well to less protection, lower price, fast build . Of course that'd mean more legal limit a; /archives//html/Amps/2012-05/msg00134.html (9,249 bytes)
30. Re: [Amps] Tubes vs. Solid State (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 04 May 2012 02:21:48 +0000; Bob, That typically happens when your output network isn't correctly done. There is an incredible amount of equipment, including HF ham transceivers comemrcially made today, that have incorrectly imp; /archives//html/Amps/2012-05/msg00151.html (11,675 bytes)
31. Re: [Amps] Tubes vs. Solid State (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 04 May 2012 03:33:53 +0000; Jim, I don't want to engage in a war about this matter, so I won't reply to all your statements, even when I feel different than you about them. But a few things you wrote, like direct questions, nee; /archives//html/Amps/2012-05/msg00152.html (19,539 bytes)
32. Re: [Amps] Tubes vs. Solid State (score: 1): Author: Bob Henderson <bob@5b4agn.net>; Date: Fri, 4 May 2012 04:18:45 +0000; clip "The basic point is this: Class B or class AB push-pull amps MUST, I repeat _MUST_ have something that provides balance around a true center point. It cannot work in pure differential mode, beca; /archives//html/Amps/2012-05/msg00154.html (9,313 bytes)
33. Re: [Amps] Tubes vs. Solid State (score: 1): Author: "Alex Eban" <alexeban@gmail.com>; Date: Fri, 4 May 2012 13:33:07 +0300; Guys, what you describe here is transformer saturation! Most likely using too small core. Alex 4Z5KS Bob, That typically happens when your output network isn't correctly done. There is an incredible; /archives//html/Amps/2012-05/msg00158.html (12,904 bytes)
34. Re: [Amps] Tubes vs. Solid State (score: 1): Author: Bob Henderson <bob@5b4agn.net>; Date: Fri, 4 May 2012 10:41:16 +0000; No that is definitely not the case. Bob, 5B4AGN _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2012-05/msg00159.html (9,159 bytes)
35. [Amps] Tubes vs. Solid State (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Fri, 4 May 2012 04:05:02 -0700; Guys, what you describe here is transformer saturation! Most likely using too small core. Alex 4Z5KS Jim VE7RF _______________________________________________ Amps mailing list Amps@contesting.com ht; /archives//html/Amps/2012-05/msg00160.html (8,329 bytes)
36. Re: [Amps] Tubes vs. Solid State (score: 1): Author: Tom Thompson <tlthompson@qwest.net>; Date: Fri, 04 May 2012 17:43:57 -0600; Bob, I am experimenting with the 300 W Freescale part. Using the brass tube output transformer with a single turn on the primary and 2 turns on the secondary without a harmonic filter I measured the; /archives//html/Amps/2012-05/msg00190.html (13,723 bytes)
37. Re: [Amps] Tubes vs. Solid State (score: 1): Author: Bob Henderson <bob@5b4agn.net>; Date: Sat, 5 May 2012 05:59:53 +0000; Tom Interesting. Thanks. With your brass tube transformer, how was Vdd fed to the drains? The 10db reduction in H3 & H5 is a significant improvement but I am wondering how much is due to the bifilar; /archives//html/Amps/2012-05/msg00198.html (15,306 bytes)
38. Re: [Amps] Tubes vs. Solid State (score: 1): Author: Bob Henderson <bob.5b4agn@gmail.com>; Date: Thu, 3 May 2012 17:55:12 +0000; Larry I agree. But Freescale themselves state H3 at -7dBc isn't unusual. 73 Bob, 5B4AGN _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.c; /archives//html/Amps/2012-05/msg00231.html (16,659 bytes)
39. Re: [Amps] Tubes vs. Solid State (score: 1): Author: Bob Henderson <bob.5b4agn@gmail.com>; Date: Thu, 3 May 2012 18:36:20 +0000; Larry Freescale make no reference to expected H3,H5 in their spec sheets. The -7dBc reference came as a result of a direct enquiry to the Freescale technical folks. I avoided use of any kind of react; /archives//html/Amps/2012-05/msg00232.html (21,696 bytes)
40. Re: [Amps] Tubes vs. Solid State (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Thu, 03 May 2012 15:52:31 -0400; There are a lot of if's, but's, and other variables, but: There is normally a lot more money in high volume, medium price than there is in low volume, high price although that depends on reliability,; /archives//html/Amps/2012-05/msg00235.html (29,685 bytes)

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