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1. [Amps] grid fuses (score: 1): Author: "Lon W. Cottingham" <k5jv@kingwoodcable.com>; Date: Wed, 19 Jul 2006 17:12:31 -0500; Greetings to all, I usually stay out of this sort of discussion and am sure that I will regret these comments. I may even get kicked off the list (at least threatened), but, statements/questions like; /archives//html/Amps/2006-07/msg00651.html (8,587 bytes)
2. Re: [Amps] grid fuses (score: 1): Author: Gudguyham@aol.com; Date: Wed, 19 Jul 2006 18:43:59 EDT; 73 de K5JV Lon W. Cottingham 1110 Golden Bear Ln. Kingwood, TX 77339 Lon, we won't punish you for all the political remarks. We'll let Leland kick your butt. Hi Hi :-) 73 lou ________________________; /archives//html/Amps/2006-07/msg00652.html (6,462 bytes)
3. Re: [Amps] grid fuses (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Wed, 19 Jul 2006 19:47:03 -0400; If fusing the grid is so "safe" why is it not used in commercial transmitters? If it protects a tube so well, why has no tube manufacturer recommended it (they recommend a surge limiting resistor in; /archives//html/Amps/2006-07/msg00653.html (8,030 bytes)
4. Re: [Amps] grid fuses (score: 1): Author: "Keith Dutson" <kdutson@sbcglobal.net>; Date: Wed, 19 Jul 2006 20:56:11 -0500; I joined this list to learn about amp design, not repair. I can see the point about not designing a fuse or limit resister in the grid circuit because it seems to be a band-aid for poor fault design.; /archives//html/Amps/2006-07/msg00654.html (9,281 bytes)
5. Re: [Amps] grid fuses (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Wed, 19 Jul 2006 22:29:43 -0400; It's a tough neighborhood here -- no doubt about it. However, I have probably learnd as much about amp design from the hostile discussions as much as the friendly ones. Make no mistake: I am not adv; /archives//html/Amps/2006-07/msg00655.html (9,338 bytes)
6. Re: [Amps] grid fuses (score: 1): Author: "Mike K6BR" <noddie@comcast.net>; Date: Wed, 19 Jul 2006 19:43:34 -0700; So, ask for your money back!! This list is about helping people, whatever the problem, design or repair. There is a lot to be learned and some time you have to sift through the chaff. There are many; /archives//html/Amps/2006-07/msg00656.html (7,586 bytes)
7. Re: [Amps] grid fuses (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Thu, 20 Jul 2006 06:38:02 -0400; That's my point exactly Joe. A fuse in the grid is exactly the opposite of what common sense and technically solid logic would dictate in any design. Worse yet, one person advocates removing reliabl; /archives//html/Amps/2006-07/msg00661.html (7,908 bytes)
8. Re: [Amps] grid fuses (score: 1): Author: GGLL <nagato@arnet.com.ar>; Date: Thu, 20 Jul 2006 10:01:19 -0300; Joe Subich, W4TV escribió: IMHO, an electronic protection system in a commercial transmitter (I mean for TV or broadcast) where it must be on the air continuously is the optimum solution. I do; /archives//html/Amps/2006-07/msg00663.html (9,694 bytes)
9. Re: [Amps] grid fuses (score: 1): Author: R L Measures <r@somis.org>; Date: Thu, 20 Jul 2006 06:44:45 -0700; Bingo, Paul ... next question: does a C-E shorted transistor limit current? I've seen the grid protection pass-transistor short in an Alpha 3, 8874 amplifier, and one of the 8874s had gold sputtering; /archives//html/Amps/2006-07/msg00669.html (11,917 bytes)
10. Re: [Amps] grid fuses (score: 1): Author: R L Measures <r@somis.org>; Date: Thu, 20 Jul 2006 06:14:59 -0700; If seatbelts are so safe, why weren't they installed in our 1940 Chevy? Tube mfgs finally approved the glitch R in the + lead of HV-PS -- years after some Amateur Radio amplifier builders figured out; /archives//html/Amps/2006-07/msg00671.html (10,697 bytes)
11. Re: [Amps] grid fuses (score: 1): Author: R L Measures <r@somis.org>; Date: Thu, 20 Jul 2006 06:17:17 -0700; ... the same basic reason for designing air-bags into motor vehicles. R L MEASURES, AG6K. 805-386-3734 r@somis.org _______________________________________________ Amps mailing list Amps@contesting.co; /archives//html/Amps/2006-07/msg00672.html (11,735 bytes)
12. Re: [Amps] grid fuses (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Thu, 20 Jul 2006 10:49:37 -0400; Non-sequitur, grid fusing was not installed even in the newest tube transmitters. In fact, the grids were generally bolted directly to the chassis wherever possible. If they can't be bolted to the c; /archives//html/Amps/2006-07/msg00673.html (9,785 bytes)
13. Re: [Amps] grid fuses (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Thu, 20 Jul 2006 11:46:52 -0400; <But for an amateur transmitter, you can replace a resistor (yes, a little <more work involved) and get on the air again. If the fault is severe, both <systems will keep you busy until the problem is; /archives//html/Amps/2006-07/msg00676.html (10,147 bytes)
14. Re: [Amps] grid fuses (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Thu, 20 Jul 2006 15:47:42 -0400; See Below; ** REPLY SEPARATOR ** I'm having a hard time seeing this. I'm not sure if any others do. If the grid is not connected to anything after the resistor or fuse blows, how can any damage be do; /archives//html/Amps/2006-07/msg00687.html (12,173 bytes)
15. Re: [Amps] grid fuses (score: 1): Author: GGLL <nagato@arnet.com.ar>; Date: Thu, 20 Jul 2006 17:37:27 -0300; Please see below: Tom W8JI escribió: How fast can evolve this level of problems?. I know of an industrial HF oscillator (350 KW) in which a system protects the triode by opening tube's grid DC; /archives//html/Amps/2006-07/msg00689.html (10,796 bytes)
16. Re: [Amps] grid fuses (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Thu, 20 Jul 2006 19:26:36 -0400; It's really pretty simple Will. I'll try to explain it one last time. There are two main catagories of excessive grid current. One is from excessive RF drive. This is caused by any number of sceneri; /archives//html/Amps/2006-07/msg00701.html (12,271 bytes)
17. Re: [Amps] grid fuses (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Thu, 20 Jul 2006 19:48:11 -0400; Tom, The problem is, you stated all this can occur after the fuse or resistor opens. It can not, only before it does. "Now when the tube faults and if the resitor opens, the grid can rise to full ano; /archives//html/Amps/2006-07/msg00702.html (15,080 bytes)
18. Re: [Amps] grid fuses (score: 1): Author: Chris Howard <chris@yipyap.com>; Date: Thu, 20 Jul 2006 17:56:07 -0600; Cathode is grounded? I thought we were talking grounded grid? If both the cathode and the grid were grounded, how did the thing ever work? help! _______________________________________________ Amps m; /archives//html/Amps/2006-07/msg00704.html (8,836 bytes)
19. Re: [Amps] grid fuses (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Thu, 20 Jul 2006 20:03:09 -0400; Will, Here's the problem, If the tube has an internal arc or is drawing heavy current between grid and anode the grid is already essentially at the anode potential, opening the grid to ground circuit; /archives//html/Amps/2006-07/msg00705.html (17,014 bytes)
20. Re: [Amps] grid fuses (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Thu, 20 Jul 2006 20:27:51 -0400; Joe, The arc to the grid would go to ground through the fuse and any HV should bleed off before the fuse would open I'd venture to say. The current from the arc would be what causes the fuse to open.; /archives//html/Amps/2006-07/msg00706.html (19,251 bytes)

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