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41. Re: [Amps] Grid fuses (score: 1): Author: Tony King - W4ZT <amps071806@w4zt.com>; Date: Fri, 21 Jul 2006 15:08:39 -0400; Only one... kill the HV with either a proper HV fuse and/or trip the HV supply off line. For the same reason you can't depend on a blown resistor to stop the arc, you can't depend on a low voltage fu; /archives//html/Amps/2006-07/msg00793.html (11,582 bytes)
42. Re: [Amps] grid fuses (score: 1): Author: Chris Howard <chris@yipyap.com>; Date: Fri, 21 Jul 2006 13:47:19 -0600; I think that's why Will asked the question about the cathode. Will a disconnected cathode emit? If not, why would a hot grid? (and I thought I was going to be quiet today...) ________________________; /archives//html/Amps/2006-07/msg00795.html (8,924 bytes)
43. Re: [Amps] grid fuses (score: 1): Author: Chris Howard <chris@yipyap.com>; Date: Fri, 21 Jul 2006 13:57:26 -0600; I've decided that was a dumb question... the real question is: how much? _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/list; /archives//html/Amps/2006-07/msg00796.html (9,370 bytes)
44. Re: [Amps] grid fuses (score: 1): Author: Chris Howard <chris@yipyap.com>; Date: Fri, 21 Jul 2006 14:01:53 -0600; That's a dumb question too. I found a web page that answers my question. nevermind _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/ma; /archives//html/Amps/2006-07/msg00797.html (9,238 bytes)
45. Re: [Amps] grid fuses (score: 1): Author: "Roy Koeppe" <royanjoy@ncn.net>; Date: Fri, 21 Jul 2006 15:21:48 -0500; "Yes, they are as low inductive as 1cm wide straps can be" How about say, five or six number 24 gauge wires in parallel, forming a skeleton strap? You know, inductors in parallel formula. 73, Roy K6X; /archives//html/Amps/2006-07/msg00798.html (7,809 bytes)
46. Re: [Amps] grid fuses (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Fri, 21 Jul 2006 16:38:59 -0400; That's how a solid strap works. RF current pushes out to the edges. The amount of inductance is directly related to the flux surrounding the conductor, and since the flux is spread out the inductanc; /archives//html/Amps/2006-07/msg00799.html (8,123 bytes)
47. Re: [Amps] grid fuses (score: 1): Author: R L Measures <r@somis.org>; Date: Fri, 21 Jul 2006 05:58:03 -0700; When did we get arcing? In a good vacuum? But this is apparently a real special kind of arc because it apparently leaves no trace behind inside the tube. Quicksand R L MEASURES, AG6K. 805-386-3734 r@; /archives//html/Amps/2006-07/msg00802.html (11,649 bytes)
48. [Amps] grid fuses (score: 1): Author: "Lon W. Cottingham" <k5jv@kingwoodcable.com>; Date: Fri, 21 Jul 2006 16:48:41 -0500; Greetings to all, This discussion has deteriorated to that of electing officers at a 7th grade 4H Club Meeting. The original point has long been forgotten. Who cares what you call it; grid protection; /archives//html/Amps/2006-07/msg00809.html (9,773 bytes)
49. Re: [Amps] grid fuses (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Fri, 21 Jul 2006 18:42:45 -0400; Lon, That's exactly the point I was trying to get at. Some protection is better than none at all. If a tube arcs internally, it's gassy as an arc can't form in a vacuum. It needs to be replaced no ma; /archives//html/Amps/2006-07/msg00811.html (14,405 bytes)
50. Re: [Amps] grid fuses (score: 1): Author: Bill Turner <dezrat@copper.net>; Date: Fri, 21 Jul 2006 16:08:40 -0700; ORIGINAL MESSAGE: -- REPLY SEPARATOR -- After reading Lon's post, I nominate him for president. Bill, W6WRT _______________________________________________ Amps mailing list Amps@contesting.com http:; /archives//html/Amps/2006-07/msg00813.html (8,123 bytes)
51. Re: [Amps] grid fuses (score: 1): Author: GGLL <nagato@arnet.com.ar>; Date: Fri, 21 Jul 2006 21:00:33 -0300; Peter Chadwick escribió: With the exception that the power supply is shut off inmediately after the trip, that's what the protection system does to protect an industrial triode. Best regards G; /archives//html/Amps/2006-07/msg00816.html (8,597 bytes)
52. Re: [Amps] grid fuses (score: 1): Author: "Peter Voelpel" <df3kv@t-online.de>; Date: Sat, 22 Jul 2006 02:16:35 +0200; Why should I do that effort if I can find straps ready to install or cut them from sheet metal? 73 Peter "Yes, they are as low inductive as 1cm wide straps can be" How about say, five or six number 2; /archives//html/Amps/2006-07/msg00817.html (8,664 bytes)
53. Re: [Amps] grid fuses (score: 1): Author: "Peter Voelpel" <df3kv@t-online.de>; Date: Sat, 22 Jul 2006 03:22:55 +0200; Not really, its quit common that tubes like YL1050, TH347 etc. which are very high gain metal ceramic tetrodes for linear mode of small tv-transmitters and linear service arc internally from time to; /archives//html/Amps/2006-07/msg00824.html (8,734 bytes)
54. Re: [Amps] grid fuses (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Fri, 21 Jul 2006 22:13:30 -0400; Thanks Peter, I was sure anyone with experience in manufacturing new PA's with power grid tubes would know this, but maybe some do not. I guess it is good to repeat it. If I tossed back 3CX3000A7's; /archives//html/Amps/2006-07/msg00826.html (9,529 bytes)
55. Re: [Amps] grid fuses (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Fri, 21 Jul 2006 22:33:37 -0400; Peter, Would you send back a gassy, or even slightly gassy 3-500Z to the manufacturer to have it gettered or a new vacuum pulled on it? I'm still sticking with what we first started with here, that t; /archives//html/Amps/2006-07/msg00829.html (10,365 bytes)
56. Re: [Amps] grid fuses (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Fri, 21 Jul 2006 22:37:00 -0400; See below; ** REPLY SEPARATOR ** Agreed Tom, that's what should be done. Best, Will _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/m; /archives//html/Amps/2006-07/msg00830.html (10,295 bytes)
57. Re: [Amps] grid fuses (score: 1): Author: R L Measures <r@somis.org>; Date: Fri, 21 Jul 2006 22:43:15 -0700; An Eimac 3cx3000A7 that arced during final test would undoubtedly be tossed into the scrap bin. Large ones have an ion pump. I disassembled a kaput 4cx5000A and I did not see any gettering material.; /archives//html/Amps/2006-07/msg00863.html (10,633 bytes)
58. Re: [Amps] grid fuses (score: 1): Author: "Roy Koeppe" <royanjoy@ncn.net>; Date: Sat, 22 Jul 2006 10:50:28 -0500; "...If it's open, the most it might do would be to attract a few electrons being negative like was mentioned...(etc.)" In the old days this was called 'contact bias,' and was the principle incorporat; /archives//html/Amps/2006-07/msg00866.html (7,713 bytes)
59. Re: [Amps] grid fuses (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sat, 22 Jul 2006 12:17:19 -0400; People like to misapply what happens in a 12AX7 dual triode and other thumb-sized tubes operating at 50-300 volts P-G voltage to fist-sized tubes running at 3kv and more. Contact bias generally does; /archives//html/Amps/2006-07/msg00872.html (8,629 bytes)
60. Re: [Amps] grid fuses (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Sat, 22 Jul 2006 13:13:01 -0400; Roy, You got it! Most of the old sweep tube amps used a form of grid leak bias. Best, Will ** REPLY SEPARATOR ** On 7/22/06 at 10:50 AM Roy Koeppe wrote: _____________________________________________; /archives//html/Amps/2006-07/msg00884.html (8,785 bytes)

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