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321. Re: [Amps] Arctic Silver (score: 1): Author: donroden@hiwaay.net; Date: Sun, 15 Dec 2013 13:34:06 -0600; the crucial thing is to get the transistor flange flat as well. The majority I've handled are not anywhere near flat, and always bowed upwards in the centre (something that hasn't improved since the; /archives//html/Amps/2013-12/msg00115.html (8,241 bytes)
322. Re: [Amps] negative screen current (score: 1): Author: donroden@hiwaay.net; Date: Mon, 30 Dec 2013 13:58:51 -0600; I too have a problem with this explanation. Electrons gathered by the screen are 'positive' current flow, no matter where they come from... No, they are going in the opposite direction . Don W4DNR __; /archives//html/Amps/2013-12/msg00193.html (7,461 bytes)
323. Re: [Amps] negative screen current (score: 1): Author: donroden@hiwaay.net; Date: Mon, 30 Dec 2013 18:31:02 -0600; Yes, and the electrons, frightened and confused, and not knowing which way is up, run in the opposite direction to the power supply or in the general direction of a lower potential. Don W4DNR The neg; /archives//html/Amps/2013-12/msg00203.html (8,722 bytes)
324. Re: [Amps] negative screen current (score: 1): Author: donroden@hiwaay.net; Date: Mon, 30 Dec 2013 19:14:57 -0600; Are you positive? Yes, If they are north of the Equator...... If you have negative screen current, you can turn off the plate supply and the electrons will *IMMEDIATLY* change directions.... but onl; /archives//html/Amps/2013-12/msg00210.html (9,226 bytes)
325. [Amps] Chinese Capacitors (score: 1): Author: donroden@hiwaay.net; Date: Mon, 20 Jan 2014 21:13:30 -0600; But the seller is in New York. How can this be ??? Don W4DNR Guaranteed Chinese, that fraud has been discussed elsewhere. Carl KM1H See Ebay item number 190875604650 73, Alek VK6APK _________________; /archives//html/Amps/2014-01/msg00197.html (9,570 bytes)
326. Re: [Amps] Tube swap (score: 1): Author: donroden@hiwaay.net; Date: Tue, 28 Jan 2014 09:56:31 -0600; Hardy, yes I made myself a Hi-pot tester as well. I forgot the specs, but I believe I can go up to 20 kV. (It may be one of Richard Measures designs). Unwritten Amps Rule # 1 Never invoke the name o; /archives//html/Amps/2014-01/msg00275.html (9,084 bytes)
327. Re: [Amps] Tube swap (score: 1): Author: donroden@hiwaay.net; Date: Wed, 29 Jan 2014 21:43:00 -0600; Use a pair of 211 tube and you will not need a parasitic suppressor. 73 Bill wa4alv Now, THATS funny........ G'night all Don W4DNR _______________________________________________ Amps mailing list A; /archives//html/Amps/2014-01/msg00312.html (8,465 bytes)
328. Re: [Amps] Vacuum relay needed (score: 1): Author: donroden@hiwaay.net; Date: Sun, 02 Feb 2014 21:42:45 -0600; I'm an idiot. No.... the screwdriver slipped. Don w4dnr _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2014-02/msg00019.html (7,153 bytes)
329. Re: [Amps] Solid State Relays Again (score: 1): Author: donroden@hiwaay.net; Date: Mon, 10 Feb 2014 10:58:08 -0600; Quoting KA4INM <ka4inm@gmail.com>: and an instant disconnect if the protection circuit detects too much screen current or a sharp increase in (negative) power supply current (an arc) surely make them; /archives//html/Amps/2014-02/msg00071.html (8,168 bytes)
330. Re: [Amps] Solid State Relays Again (score: 1): Author: donroden@hiwaay.net; Date: Mon, 10 Feb 2014 12:24:15 -0600; I guess with transformers the relay should switch in on the peak voltage. As current peaks 90 degree behind that should be the best moment with least surge current. 73 Peter But if you switch at zer; /archives//html/Amps/2014-02/msg00077.html (8,908 bytes)
331. Re: [Amps] Solid State Relays Again (score: 1): Author: donroden@hiwaay.net; Date: Mon, 10 Feb 2014 13:52:52 -0600; naught times naught equals naught ......... or has that changed with the new math ? Don W4DNR _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contes; /archives//html/Amps/2014-02/msg00081.html (8,262 bytes)
332. Re: [Amps] Umac 606 (score: 1): Author: donroden@hiwaay.net; Date: Thu, 13 Feb 2014 11:17:47 -0600; Has anyone made an amplifier using the Umac 606? That grid will leak all over your ham shack floor. Don W4DNR _______________________________________________ Amps mailing list Amps@contesting.com ht; /archives//html/Amps/2014-02/msg00107.html (7,217 bytes)
333. Re: [Amps] Fan Noise in GS-35b Amplifiers (score: 1): Author: donroden@hiwaay.net; Date: Thu, 20 Feb 2014 12:29:06 -0600; Dont overlook a good muffin fan either. The EBM Papst 4600N was used in later production LK-800's using the 3 3CPX800A7's at about 3100V. That is a lot of fin area and back pressure. I ran a quad of; /archives//html/Amps/2014-02/msg00186.html (8,359 bytes)
334. [Amps] QRO operation into a 80 meter vertical (score: 1): Author: donroden@hiwaay.net; Date: Thu, 20 Feb 2014 17:43:15 -0600; Slightly OFF TOPIC , so respond direct please. I have a 145 foot Rohn 45G with insulated guys, but grounded base in concrete. no room for radials ... 33 feet at most over 60 degrees. Tower is between; /archives//html/Amps/2014-02/msg00193.html (7,191 bytes)
335. Re: [Amps] QRO operation into a 80 meter vertical (score: 1): Author: donroden@hiwaay.net; Date: Fri, 21 Feb 2014 10:36:05 -0600; Sorry [Amps] but this antenna conversation is here and now, QRO means getting the most RF into the atmosphere as possible. Antennas are either amplifiers or dummy loads. I don't want to build a dumm; /archives//html/Amps/2014-02/msg00205.html (8,060 bytes)
336. Re: [Amps] Shipping SB200 with Tube Installed (score: 1): Author: donroden@hiwaay.net; Date: Sat, 22 Feb 2014 19:45:44 -0600; crushed newspaper works well but you have to get it on the sides, in between, under, over, and in front of them. Use enough so that the cover compresses the material a bit to add a bit extra pressure; /archives//html/Amps/2014-02/msg00224.html (7,819 bytes)
337. Re: [Amps] new Freescale LDMOS part (score: 1): Author: donroden@hiwaay.net; Date: Wed, 12 Mar 2014 03:00:48 -0500; I wonder if anyone has had a chance to look at the new MMRF1006H part from Freescale. It appears tailored for 10-500 MHz, with 24 dB gain at the low frequencies, 50 VDC, 1 kW CW. Might be costly thou; /archives//html/Amps/2014-03/msg00046.html (8,508 bytes)
338. Re: [Amps] new Freescale LDMOS part (score: 1): Author: donroden@hiwaay.net; Date: Wed, 12 Mar 2014 03:00:49 -0500; I wonder if anyone has had a chance to look at the new MMRF1006H part from Freescale. It appears tailored for 10-500 MHz, with 24 dB gain at the low frequencies, 50 VDC, 1 kW CW. Might be costly thou; /archives//html/Amps/2014-03/msg00047.html (8,524 bytes)
339. Re: [Amps] been dead here (score: 1): Author: donroden@hiwaay.net; Date: Wed, 12 Mar 2014 15:32:35 -0500; OK..... slow day ... To the Big Gunners out there .... KT36XA tribander. what is the optimum height between ground level and 140m feet ? A ring rotor at 70 feet, or all the way to the top ? I'm on a; /archives//html/Amps/2014-03/msg00055.html (7,876 bytes)
340. Re: [Amps] 4CX5000A in grounded-grid (score: 1): Author: donroden@hiwaay.net; Date: Tue, 18 Mar 2014 13:22:12 -0500; There was an article in QST, the first I believe, where 4x150A tubes were operated in grounded grid with both grids grounded. However, they were operated an reduce power. I built a "30L-1 Copy" usin; /archives//html/Amps/2014-03/msg00105.html (9,145 bytes)

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