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Total 13 documents matching your query.

1. Re: [Amps] SB-200 power supply diodes (score: 1): Author: "Jim Garland" <4cx250b@muohio.edu>; Date: Sat, 26 Mar 2011 07:24:00 -0600; Kathy, I'd advise replacing the diode string in your SB-200 with 1N4007 diodes instead of 1N5408. Not that there's anything wrong with the 1N5408, but the holes in the circuit board will have to be d; /archives//html/Amps/2011-03/msg00202.html (8,442 bytes)
2. Re: [Amps] SB-200 power supply diodes (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Sat, 26 Mar 2011 07:49:14 -0700; I agree. I didn't think about the holes when I recommended the 1n5408's. They have a higher current rating, of course, but as Jim says, it won't make any difference in the SB200. -- Vic, K2VCO Fresno; /archives//html/Amps/2011-03/msg00204.html (9,269 bytes)
3. Re: [Amps] SB-200 power supply diodes (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 26 Mar 2011 12:11:45 -0400; I mentioned the 1N5408 holes 2 days ago at the start of the thread. I still prefer them to 1N4007's as their surge current survivability far exceeds the 1N4007. After all the idea is to not have smok; /archives//html/Amps/2011-03/msg00205.html (11,476 bytes)
4. Re: [Amps] SB-200 power supply diodes (score: 1): Author: "Jim W7RY" <w7ry@inbox.com>; Date: Sat, 26 Mar 2011 09:25:17 -0700; Agreed Jim! 3 amp diodes are an overkill on the SB-200 and SB-220. 73 Jim W7RY _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailma; /archives//html/Amps/2011-03/msg00206.html (10,645 bytes)
5. Re: [Amps] SB-200 power supply diodes (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Sat, 26 Mar 2011 09:35:10 -0700 (PDT); I disagree! Yes, you do have to enlarge the holes to use the 1N5408. However, the added protection of both the higher current rating and the surge of the 1N5408 over the 1N4007 will assure that if on; /archives//html/Amps/2011-03/msg00207.html (8,510 bytes)
6. Re: [Amps] SB-200 power supply diodes (score: 1): Author: TexasRF@aol.com; Date: Sun, 27 Mar 2011 09:00:54 EDT; Think about this again. The SB200/220 both use a voltage doubler capacitor filter hv supply. We know that peak currents in these type supplies can be five to ten times the average current. So, with a; /archives//html/Amps/2011-03/msg00212.html (11,424 bytes)
7. Re: [Amps] SB-200 power supply diodes (score: 1): Author: "Jim W7RY" <w7ry@inbox.com>; Date: Sun, 27 Mar 2011 07:48:13 -0700; Think about this again... Please send your math that supports your claim below as to current draw (3 to 6 amps 60 times per second)? Also, please take a look at the schematic of both the SB-200 and t; /archives//html/Amps/2011-03/msg00213.html (12,349 bytes)
8. Re: [Amps] SB-200 power supply diodes (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sun, 27 Mar 2011 11:05:10 -0400; Very correct Gerald. Even Dentron and Amp Supply used 2.5A and 3A diodes as does Ameritron from the beginning with the AL-80 series with 1N5408's. I do a fairly large SB-200/220 repair business and 6; /archives//html/Amps/2011-03/msg00215.html (13,945 bytes)
9. Re: [Amps] SB-200 power supply diodes (score: 1): Author: "Paul Kraemer" <elespe@lisco.com>; Date: Sun, 27 Mar 2011 10:50:46 -0500; Excellent point Gerald I also wonder if any one has done the math or actually measured the increase in diode / transformer current from arbitrarily increasing the original filter cap size from the or; /archives//html/Amps/2011-03/msg00216.html (9,306 bytes)
10. Re: [Amps] SB-200 power supply diodes (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Sun, 27 Mar 2011 17:37:34 -0400; 1N4007 has a peak current rating of 30 amps for one cycle. 10 amp repetitive peak current and 1 amp average current. The 1N5408 has a peak current rating of 200 amps for one cycle. 50 amp repetitive; /archives//html/Amps/2011-03/msg00218.html (12,605 bytes)
11. Re: [Amps] SB-200 power supply diodes (score: 1): Author: Steve Thompson <g8gsq72@gmail.com>; Date: Sun, 27 Mar 2011 22:54:20 +0100; http://www.duncanamps.com/psud2/index.html for a dedicated pspice programme which will give you a very good idea of what's what in a PSU - including allowing for transformer resistance which isn't so; /archives//html/Amps/2011-03/msg00219.html (9,063 bytes)
12. Re: [Amps] SB-200 power supply diodes (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Sun, 27 Mar 2011 19:44:59 -0700 (PDT); Actually, the original electrolytic capacitors were -50% / +80% in value. New capacitors generally come in +/-10% or +/-20%. Since the +/-20% capacitors are generally quite a bit less in cost, and si; /archives//html/Amps/2011-03/msg00220.html (8,914 bytes)
13. Re: [Amps] SB-200 power supply diodes (score: 1): Author: TexasRF@aol.com; Date: Mon, 28 Mar 2011 08:11:30 EDT; Hi Jim, the math is well known so I won't repeat it here. You are 100% correct about the THOUSANDS of SB200/220 units in service. The discussion had addressed replacing BLOWN diodes and it only makes; /archives//html/Amps/2011-03/msg00222.html (13,995 bytes)

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