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Total 9 documents matching your query.

1. [Amps] soft start on filament (score: 1): Author: <panos2@otenet.gr>; Date: Sun, 29 Aug 2010 08:30:04 +0300; hello what do you mean soft start on filament ?? linear slowly warm up ? step warm up ? and if so why is call it instant ? regards panos SV4JYI _______________________________________________ Amps ma; /archives//html/Amps/2010-08/msg00428.html (6,776 bytes)
2. Re: [Amps] soft start on filament (score: 1): Author: "Hsu" <hsu4qro@gmail.com>; Date: Sun, 29 Aug 2010 13:58:35 +0800; It is due to the current inrush, that 'll led to large magnetic force and damage the filament.Another reason is the current inrush will led to the main fuse burn or the trip switch active. 73!Hsu ___; /archives//html/Amps/2010-08/msg00429.html (8,303 bytes)
3. Re: [Amps] soft start on filament (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Sat, 28 Aug 2010 23:47:19 -0700; ORIGINAL MESSAGE: REPLY: All tube filaments or heaters have much lower resistance when they are cold compared to when they are hot. If you apply the full voltage when cold, the current will be very l; /archives//html/Amps/2010-08/msg00430.html (7,904 bytes)
4. Re: [Amps] soft start on filament (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Sun, 29 Aug 2010 04:06:35 -0400; Hsu and Bill covered it pretty well, but I'll add a couple points. Although as has been pointed out they might better be called "quick start", but the instant start comes from just throwing the switc; /archives//html/Amps/2010-08/msg00431.html (9,824 bytes)
5. [Amps] soft start on filament (score: 1): Author: <panos2@otenet.gr>; Date: Sun, 29 Aug 2010 12:53:09 +0300; THANK YOU ALL FOR THE PERLAY ok that explains why my 2x 4 400 in my linear reduse ther power bery fast well can i use a resistor in series to the filament or the time is still fast ? and why the use; /archives//html/Amps/2010-08/msg00433.html (8,325 bytes)
6. Re: [Amps] soft start on filament (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Sun, 29 Aug 2010 04:16:34 -0700; ORIGINAL MESSAGE: REPLY: Step-start circuits usually have the resistor in the primary of the transformer, but it could be put in the filament side too. The current is less on the primary so the stres; /archives//html/Amps/2010-08/msg00437.html (8,120 bytes)
7. [Amps] soft start on filament (score: 1): Author: John Lyles <jtml@losalamos.com>; Date: Sun, 29 Aug 2010 11:22:07 -0600; Commercially, what is usually done to protect thoriated-tungsten filaments (for tubes with handles) from excess inrush current is to limit the current to no more than 2 X the rated current at nominal; /archives//html/Amps/2010-08/msg00441.html (9,523 bytes)
8. [Amps] soft start on filament (score: 1): Author: <panos2@otenet.gr>; Date: Sun, 29 Aug 2010 21:09:15 +0300; thank you all for the info now john lyles what do you mean by magnetic design controll like the old welding machines that the core was moving manualy withe a rod ?? if so yes it will work peronaly i; /archives//html/Amps/2010-08/msg00442.html (8,497 bytes)
9. [Amps] soft start on filament (score: 1): Author: John Lyles <jtml@losalamos.com>; Date: Sun, 29 Aug 2010 14:26:18 -0600; No I mean a transformer that is designed with shunt or gap, I cannot remember how it is done. Basically the filament transformer will not go beyond 2 X the normal current without voltage falling off.; /archives//html/Amps/2010-08/msg00444.html (9,483 bytes)

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