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1. [Amps] Surge resistor (score: 1): Author: "Rick Stealey" <rstealey@hotmail.com>; Date: Wed, 21 Mar 2007 13:22:47 +0000; Tom, W8JI, says: The small glitch resistors in your amp don't do a darned thing I am in the process of finishing up my 8877 amp, and the plans I am using show a 0.6 ohm 1 watter and a 50 ohm 50 watte; /archives//html/Amps/2007-03/msg00276.html (9,009 bytes)
2. Re: [Amps] Surge resistor (score: 1): Author: rgroh@swbell.net; Date: Wed, 21 Mar 2007 08:03:09 -0700 (PDT); Lost the original contents of your message but I think this might be some information of value regarding the surge resistor. I took a quick look at Eimac's 'Care and Feeding of Power Tubes' applicati; /archives//html/Amps/2007-03/msg00278.html (7,623 bytes)
3. Re: [Amps] Surge resistor (score: 1): Author: TexasRF@aol.com; Date: Wed, 21 Mar 2007 11:17:00 EDT; Rick, if the big resistor drops 100v at 2A then it must be 50 ohms, right? This is a typical value used in series with the high voltage lead to act as low frequency parasitic suppression circuit. An; /archives//html/Amps/2007-03/msg00279.html (8,771 bytes)
4. Re: [Amps] Surge resistor (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Wed, 21 Mar 2007 08:27:50 -0700; The 50 ohm surge resistor is designed to reduce the very high current that would occur if there were an arc in the tube as a result of gas, or a 'whisker' on a metallic structure in the tube, for exa; /archives//html/Amps/2007-03/msg00281.html (9,431 bytes)
5. Re: [Amps] Surge resistor (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Wed, 21 Mar 2007 12:11:13 -0400; Dare we say that a glitch can also be caused by a parasitic oscillation. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.c; /archives//html/Amps/2007-03/msg00283.html (10,781 bytes)
6. Re: [Amps] Surge resistor (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 21 Mar 2007 12:32:17 -0400; Use Ohm's law. We know that always works for heat. Let's assume you have 10 ohms of impedance in the supply between the filter caps stored energy and the anode system with 4000 volts (this is pretty; /archives//html/Amps/2007-03/msg00285.html (10,811 bytes)
7. Re: [Amps] Surge resistor (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 21 Mar 2007 13:41:34 -0400; We can say it, but we should also be clear that RF is RF and if a PA tube arcs from a parasitic it would also arc from normal RF drive. It's all a matter of the peak anode voltage and the voltage br; /archives//html/Amps/2007-03/msg00286.html (8,587 bytes)
8. Re: [Amps] Surge resistor (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Wed, 21 Mar 2007 18:57:06 +0000; Along with several other well-documented possibilities, including sporadic releases of gas into the vacuum inside the tube, microscopic 'whiskers' of metal inside the tube, stray hairs or insects out; /archives//html/Amps/2007-03/msg00287.html (9,461 bytes)
9. Re: [Amps] Surge resistor (score: 1): Author: "Harold Mandel" <ka1xo@juno.com>; Date: Wed, 21 Mar 2007 15:29:44 -0400; Even the corners of metal connecting lugs and terminals in the high voltage departments in amplifiers are potential lightning rods. A sharp metal corner or edge is a place where a corona discharge ca; /archives//html/Amps/2007-03/msg00288.html (10,579 bytes)
10. Re: [Amps] Surge resistor (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 21 Mar 2007 19:42:05 +0000; I've found Kapton tape can be handy, and some transistor silicone thermal mounting insulators have high voltage ratings and come in sizeable sheets. Steve ___________________________________________; /archives//html/Amps/2007-03/msg00289.html (8,429 bytes)
11. Re: [Amps] Surge resistor (score: 1): Author: "Rick Stealey" <rstealey@hotmail.com>; Date: Wed, 21 Mar 2007 23:02:56 +0000; Thanks for all the great responses to my question about glich resistors. I had no idea there was so much info available for such a simple question. Especially Tom, W8JI, you pointed out something I h; /archives//html/Amps/2007-03/msg00292.html (9,128 bytes)
12. Re: [Amps] Surge resistor (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Thu, 22 Mar 2007 10:07:54 +0100 (CET); Over 40 years ago, as an apprentice, I worked on a TWT ground station transmitter where we had a crowbar on the high voltage supply. By K5PRO standards, it would be pretty small, being only (!) 22kV; /archives//html/Amps/2007-03/msg00297.html (8,342 bytes)

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