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1. [Amps] Step Start on a 3KA Amp (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Sun, 17 Sep 2006 13:06:27 -0400; Can anyone tell me what good is it to have one of those cone heaters in series with the primary of the plate transformer? When the cone heater is in the circuit, the secondary voltage is 2800VDC and; /archives//html/Amps/2006-09/msg00207.html (6,461 bytes)
2. Re: [Amps] Step Start on a 3KA Amp (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Sun, 17 Sep 2006 20:44:53 -0700; The current drawn during the period that the filter capacitors initially charge is huge and this resistance limits the current during this time. If you are looking at the voltage drop without load, o; /archives//html/Amps/2006-09/msg00208.html (7,735 bytes)
3. Re: [Amps] Step Start on a 3KA Amp (score: 1): Author: Gudguyham@aol.com; Date: Mon, 18 Sep 2006 00:04:20 EDT; Can anyone tell me what good is it to have one of those cone heaters in series with the primary of the plate transformer? When the cone heater is in the circuit, the secondary voltage is 2800VDC and; /archives//html/Amps/2006-09/msg00209.html (8,049 bytes)
4. Re: [Amps] Step Start on a 3KA Amp (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Mon, 18 Sep 2006 00:24:44 -0400; Thanks to all who responded to my search for info on the step start. I realize now that it is the current that is being limited for a second and that's what saves the diodes and caps. The guy I bough; /archives//html/Amps/2006-09/msg00210.html (9,495 bytes)
5. Re: [Amps] Step Start on a 3KA Amp (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Mon, 18 Sep 2006 07:36:00 +0100; All the good happened in the first two or three mains cycles, when the resistor limited the surge current to less than 8A (<240V / 30 ohms). By the time you can see anything on a meter, the surge is; /archives//html/Amps/2006-09/msg00211.html (7,876 bytes)
6. Re: [Amps] Step Start on a 3KA Amp (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Mon, 18 Sep 2006 09:25:06 -0400; Hi Larry, there are no solenoid relays in the power supply to control the duration that the cone heater to be in the circuit. The switch on the front of the amp is manually switched from off to pre-o; /archives//html/Amps/2006-09/msg00213.html (9,834 bytes)
7. Re: [Amps] Step Start on a 3KA Amp (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Mon, 18 Sep 2006 13:03:54 -0400; Ian, The first 1 to 5 cycles is the worst part of the surge, but from tests that was run by a ham on this mailer, the transformer didn't settle down until 30 to 40 cycles. This was captured on a stor; /archives//html/Amps/2006-09/msg00217.html (9,026 bytes)
8. Re: [Amps] Step Start on a 3KA Amp (score: 1): Author: "Phil Clements" <philc@texascellnet.com>; Date: Tue, 19 Sep 2006 12:50:21 -0500; The reason for the cone heater instead of a 25-50 watt resistor is that this is a "manual" step-start circuit on the Henrys. It only has three parts; a cone heater, a switch, and the operator's hand; /archives//html/Amps/2006-09/msg00222.html (9,180 bytes)
9. Re: [Amps] Step Start on a 3KA Amp (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Tue, 19 Sep 2006 19:48:51 +0100; Will had written: Sounds a bit primitive - no wonder it needs that big resistor! With so many well-known ways to make a completely automatic step-start, it seems a really strange decision to use a ma; /archives//html/Amps/2006-09/msg00223.html (10,422 bytes)
10. Re: [Amps] Step Start on a 3KA Amp (score: 1): Author: "Phil Clements" <philc@texascellnet.com>; Date: Tue, 19 Sep 2006 14:06:36 -0500; Many of the Henry amplifiers were sold to Government and Commercial users. They were in U.S. Embassies all over the world. Henry assumed that the operators would read and adhere to the manuals. If y; /archives//html/Amps/2006-09/msg00224.html (8,782 bytes)
11. Re: [Amps] Step Start on a 3KA Amp (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Tue, 19 Sep 2006 16:01:40 -0400; Please remember that this thread started by me asking about a step start in a 30+ year old amplifier from Henry, the 3KA. There are a lot of things that could have been done differently in this amp b; /archives//html/Amps/2006-09/msg00225.html (12,278 bytes)
12. Re: [Amps] Step Start on a 3KA Amp (score: 1): Author: "Harold Mandel" <ka1xo@juno.com>; Date: Tue, 19 Sep 2006 16:05:21 -0400; There are all sorts of delay relays available in the commercial electrical market. All elevators use these plug-in devices. The modern ones run on a.c. or D.C, and from 24 to 240 volts, all on the sa; /archives//html/Amps/2006-09/msg00226.html (10,508 bytes)
13. Re: [Amps] Step Start on a 3KA Amp (score: 1): Author: "Larry Carman" <lncarman@swbell.net>; Date: Tue, 19 Sep 2006 17:44:43 -0500; Bob, I must agree that overall simplicity is in most part a ham's best friend when it comes to amplifiers. Fewer components mean fewer problems. Many modern legal limit amplifiers allow no error for; /archives//html/Amps/2006-09/msg00232.html (13,245 bytes)
14. Re: [Amps] Step Start on a 3KA Amp (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Tue, 19 Sep 2006 18:59:14 -0400; Hal and everyone, Personally, I always used a 1 second delay, but the transformer wasn't as large as the one that I think you have, if it's the one you showed me photos of. There's other factors like; /archives//html/Amps/2006-09/msg00233.html (14,001 bytes)
15. Re: [Amps] Step Start on a 3KA Amp (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Tue, 19 Sep 2006 19:09:15 -0400; Larry, The more components in a circuit, the odds of a failure grow expotentially. Keep it as simple as possible is the way I was taught, and I think in these days, we all sometimes over do what real; /archives//html/Amps/2006-09/msg00234.html (15,550 bytes)
16. Re: [Amps] Step Start on a 3KA Amp (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Wed, 20 Sep 2006 10:33:44 +0100; Could someone point us to a schematic, please? (BAMA doesn't have it.) -- 73 from Ian GM3SEK _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contest; /archives//html/Amps/2006-09/msg00244.html (8,786 bytes)
17. Re: [Amps] Step Start on a 3KA Amp (score: 1): Author: PA3DUV <pa3duv@planet.nl>; Date: Wed, 20 Sep 2006 21:27:43 +0200; Ian, A picture of the Emtron switched mode softstarter + schematic diagram are available at: http://ph.groups.yahoo.com/group/ham_amplifiers/photos I've heard that Emtron is selling their softstarter; /archives//html/Amps/2006-09/msg00257.html (9,819 bytes)

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