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1. [Amps] Soft Start (score: 1): Author: "Rich" <rdjmgmt@socket.net>; Date: Tue, 9 Aug 2005 22:05:54 -0500; Thanks for the help guys, and a special thanks to KK4MS for the link to RF parts showing the inrush protectors. http://www.rfparts.com/inrush.html Rich , kd0zz _______________________________________; /archives//html/Amps/2005-08/msg00358.html (6,410 bytes)
2. [Amps] Soft Start (score: 1): Author: "Rich" <rdjmgmt@socket.net>; Date: Fri, 12 Aug 2005 11:21:10 -0500; OK guys I made the subject soft start , but that about the only thing right this time. The resistor should be big enough , 50ohms 100w. It all worked one part at a time but when I hooked it all up to; /archives//html/Amps/2005-08/msg00439.html (7,623 bytes)
3. Re: [Amps] Soft Start (score: 1): Author: Theo Bellamy <theo.bellamy@spirittelecom.com>; Date: Fri, 12 Aug 2005 12:59:53 -0400; Why not just put the soft start relay coil across the primary. Since there will be a big voltage drop across the step start resistors - leaving very low voltage across the transformer primary until t; /archives//html/Amps/2005-08/msg00441.html (8,629 bytes)
4. Re: [Amps] Soft Start (score: 1): Author: Theo Bellamy <theo.bellamy@spirittelecom.com>; Date: Fri, 12 Aug 2005 13:15:52 -0400; silly me .... that works with a B+ supply, but probably not with a filament xmfr. Sorry .... Theo Why not just put the soft start relay coil across the primary. Since there will be a big voltage drop; /archives//html/Amps/2005-08/msg00444.html (9,240 bytes)
5. Re: [Amps] Soft Start (score: 1): Author: TexasRF@aol.com; Date: Fri, 12 Aug 2005 13:42:53 EDT; An interesting characteristic of an AC relay is that it buzzes like crazy as the voltage ramps up to the value it needs to fully operate. I assume that the relay contacts are doing that as well which; /archives//html/Amps/2005-08/msg00446.html (10,093 bytes)
6. Re: [Amps] Soft Start (score: 1): Author: R.Measures <r@somis.org>; Date: Fri, 12 Aug 2005 14:21:40 -0700; That's why a DC coil relay is needed for step-start. Does hotswitching @ 60Hz sound okay to you? Richard L. Measures, AG6K, 805.386.3734. www.somis.org _______________________________________________; /archives//html/Amps/2005-08/msg00450.html (11,753 bytes)
7. Re: [Amps] Soft Start (score: 1): Author: TexasRF@aol.com; Date: Fri, 12 Aug 2005 18:31:55 EDT; By the time the relay starts buzzing the AC voltage is probably up to maybe 70% of maximum and the turn on surge is about over. The buzzing contacts then will be shorting across the limiting resistor; /archives//html/Amps/2005-08/msg00451.html (12,934 bytes)
8. [Amps] Soft start (score: 1): Author: "Ken Durand" <N4zed@comcast.net>; Date: Sat, 31 May 2014 16:41:20 -0400; I have enough stuff in the junk box to make a traditional soft start but, I was looking at the place and found some OTC soft starts.anybody ever used anything similar? 251286605912 "You need only ref; /archives//html/Amps/2014-05/msg00144.html (6,616 bytes)
9. Re: [Amps] Soft start (score: 1): Author: "Jim W7RY" <w7ry@centurytel.net>; Date: Sat, 31 May 2014 15:09:12 -0700; Support the Chinese or support the US. Mine is 281334638284 73 Jim W7RY I have enough stuff in the junk box to make a traditional soft start but, I was looking at the place and found some OTC soft st; /archives//html/Amps/2014-05/msg00145.html (7,725 bytes)
10. Re: [Amps] Soft start (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 31 May 2014 21:10:42 -0400; For $15 including shipping buy one and report how it works. Remember it is for 220-240V only and the only thing 30A is the relay which has a 24VDC coil. Im not sure how the thermistors are configured; /archives//html/Amps/2014-05/msg00146.html (8,652 bytes)
11. Re: [Amps] Soft start (score: 1): Author: donroden@hiwaay.net; Date: Sat, 31 May 2014 20:22:01 -0500; Carl, please explain the anti-collision part.... I may get one for my airplane. Don W4DNR Ive bought several RF transistors and modules from that seller and all have worked fine but that doesnt mean; /archives//html/Amps/2014-05/msg00147.html (6,983 bytes)
12. Re: [Amps] Soft start (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sun, 1 Jun 2014 09:53:34 -0400; I dont have my Chinese to English phrase book handy. Carl KM1H Carl, please explain the anti-collision part.... I may get one for my airplane. Don W4DNR Quoting Carl <km1h@jeremy.mv.com>: Ive bought; /archives//html/Amps/2014-06/msg00000.html (7,085 bytes)
13. Re: [Amps] Soft start (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sun, 01 Jun 2014 22:02:47 +0000; Jim, Ken, Support the Chinese or support the US. I just had a look at both sales. It's interesting to note that the US seller charges more money for the bare board, than the Chinese seller does for t; /archives//html/Amps/2014-06/msg00001.html (8,317 bytes)
14. Re: [Amps] Soft start (score: 1): Author: Bill Turner <dezrat@outlook.com>; Date: Sun, 1 Jun 2014 23:23:49 -0700; ORIGINAL MESSAGE: (may be snipped) While I have nothing at all against China, I don't like the situation of a single country acting as the factory for the entire world. REPLY: This situation will not; /archives//html/Amps/2014-06/msg00002.html (7,400 bytes)
15. [Amps] Soft Start (score: 1): Author: Arnie Pfingst <arnie123@hotmail.com>; Date: Wed, 27 Dec 2017 02:31:27 +0000; Once upon a time, i had a capacitor explode upon start up. I've heard stories for and against adding a soft start circuit to my amplifiers.(Some say 20 ohm resistors, and others say 30 or 40 ohm.) Th; /archives//html/Amps/2017-12/msg00165.html (6,636 bytes)
16. Re: [Amps] Soft Start (score: 1): Author: "Jim W7RY" <jimw7ry@gmail.com>; Date: Tue, 26 Dec 2017 20:59:49 -0600; I recommend 10 Ohms. I use 2 resistors and 2 relays. There are fuses in series with the resistors to protect them. Why would a cap blowing up cause an issue with a step start circuit? Again, I use 2; /archives//html/Amps/2017-12/msg00166.html (8,313 bytes)
17. Re: [Amps] Soft Start (score: 1): Author: Warren Volz <warren@warrenvolz.com>; Date: Tue, 26 Dec 2017 21:08:02 -0600; Id recommend a step start with fuses. I have w7rys board in my sb220 and the fuses saved me from a bad tube once already. -Warren _______________________________________________ Amps mailing list Amp; /archives//html/Amps/2017-12/msg00167.html (9,144 bytes)
18. Re: [Amps] Soft Start (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Tue, 26 Dec 2017 21:58:12 -0600; A related question. Once long ago I read that power cycles are very hard on filaments. Is that also the case with soft starts, or does the soft start reduce the thermal shock issues? Kim N5OP "People; /archives//html/Amps/2017-12/msg00169.html (10,027 bytes)
19. Re: [Amps] Soft Start (score: 1): Author: "Jim W7RY" <jimw7ry@gmail.com>; Date: Wed, 27 Dec 2017 06:25:27 -0600; Soft start (I call it step start) does reduce filament inrush current. As long as it's on the filament transformer primary. Which it is in the SB200, SB220, TL922, L4B and TenTec Titan... And many ot; /archives//html/Amps/2017-12/msg00170.html (10,851 bytes)
20. Re: [Amps] Soft Start (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Wed, 27 Dec 2017 09:10:05 -0600; Yes, more accurately a step-start. Regardless, thats reassuring to know! Kim N5OP "People that make music together cannot be enemies, at least as long as the music lasts." -- Paul Hindemith _________; /archives//html/Amps/2017-12/msg00171.html (12,096 bytes)

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