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21. Re: [Amps] grid fuses (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Thu, 20 Jul 2006 17:39:26 -0700; The cathode is typically connected to ground through the cathode bias network (zener diode in series with bias cutoff resistor/shorting relay) and the grid current return resistor (the grid current c; /archives//html/Amps/2006-07/msg00707.html (9,842 bytes)
22. Re: [Amps] grid fuses (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Thu, 20 Jul 2006 21:57:01 -0400; So the grid instantly cools, all leakage currents or arcs to the anode vanish, and the grid remains at zero volts at the instant of grid opening. Is that what you are proposing?. Never mind, I proba; /archives//html/Amps/2006-07/msg00708.html (9,760 bytes)
23. Re: [Amps] grid fuses (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Thu, 20 Jul 2006 22:00:04 -0400; Yes. Through the filament choke, input circuit, and/or cathode return path. If the cathode had no "ground path" to the negative rail or a high frequency ground path through the input circuit and exc; /archives//html/Amps/2006-07/msg00709.html (9,294 bytes)
24. Re: [Amps] grid fuses (score: 1): Author: Chris Howard <chris@yipyap.com>; Date: Thu, 20 Jul 2006 20:57:52 -0600; The cathode is grounded and the grid is grounded. I get the picture. [Should I lick my fingers and grab the cathode with one hand and the grid with the other hand? :-) I'll bet that would keep me fro; /archives//html/Amps/2006-07/msg00710.html (9,933 bytes)
25. Re: [Amps] grid fuses (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Thu, 20 Jul 2006 23:37:34 -0400; See below; ** REPLY SEPARATOR ** If the grid to ground circuit is open (fuse or resistor blown open), it is impossible for the anode to arc to the grid. It's impossible for any open circuit to carry; /archives//html/Amps/2006-07/msg00711.html (11,291 bytes)
26. Re: [Amps] grid fuses (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Fri, 21 Jul 2006 02:30:16 -0400; Rich, How can it collect electrons from the cathode and take a charge when the path back to the cathode is broken via a blown fuse between the grid and ground making an open circuit? That would be li; /archives//html/Amps/2006-07/msg00712.html (11,267 bytes)
27. Re: [Amps] grid fuses (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Fri, 21 Jul 2006 11:59:13 +0200 (CEST); I was always taught that to leave an electrode floating (which is what the grid is doing after the fuse blows) is bad practcie and can lead to tube damage. 73 Peter G3RZP ____________________________; /archives//html/Amps/2006-07/msg00719.html (8,207 bytes)
28. Re: [Amps] grid fuses (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Fri, 21 Jul 2006 07:33:55 -0400; It is already arcing. That is what makes the resistor fail. You can doubt it, but if you start an arc with 50 volts the lead can pull back 1/4 inch and still maintain the arc through plasma. With 30; /archives//html/Amps/2006-07/msg00727.html (10,934 bytes)
29. Re: [Amps] grid fuses (score: 1): Author: R L Measures <r@somis.org>; Date: Thu, 20 Jul 2006 20:18:26 -0700; Such as? R L MEASURES, AG6K. 805-386-3734 r@somis.org _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-07/msg00728.html (8,901 bytes)
30. Re: [Amps] grid fuses (score: 1): Author: R L Measures <r@somis.org>; Date: Thu, 20 Jul 2006 20:33:39 -0700; 3-500Zs fail from the filament helices bending laterally at their unsupported mid-point and touching the grid - causing a filament-grid short. Are you implying that mistuning or overdriving can cause; /archives//html/Amps/2006-07/msg00729.html (12,568 bytes)
31. Re: [Amps] grid fuses (score: 1): Author: R L Measures <r@somis.org>; Date: Thu, 20 Jul 2006 21:47:33 -0700; ... collecting a negative charge from electrons emitting from the cathode. Free, unsolicited advice for young debaters: When you don't know, opening your mouth not advisable. R L MEASURES, AG6K. 805-; /archives//html/Amps/2006-07/msg00734.html (9,629 bytes)
32. Re: [Amps] grid fuses (score: 1): Author: R L Measures <r@somis.org>; Date: Thu, 20 Jul 2006 21:49:38 -0700; This is a joke, right? R L MEASURES, AG6K. 805-386-3734 r@somis.org _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/; /archives//html/Amps/2006-07/msg00735.html (9,180 bytes)
33. Re: [Amps] grid fuses (score: 1): Author: R L Measures <r@somis.org>; Date: Fri, 21 Jul 2006 04:55:07 -0700; I was taught that Santa Claus' elves built toys, but the boxes they came in said the stuff was made in the U. S. A. or made in Japan. As I see it, someone other than yours truly needs to try floating; /archives//html/Amps/2006-07/msg00742.html (8,642 bytes)
34. Re: [Amps] grid fuses (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Fri, 21 Jul 2006 09:47:52 -0400; You have obviously not been knocked on your but by a capacitor that is totally disconnected from the circuit and in storage. There is a reason that high capacity devices are shipped and stored with a; /archives//html/Amps/2006-07/msg00756.html (9,537 bytes)
35. Re: [Amps] grid fuses (score: 1): Author: Bill Turner <dezrat@copper.net>; Date: Fri, 21 Jul 2006 07:16:22 -0700; ORIGINAL MESSAGE: -- REPLY SEPARATOR -- Stray electrons within the tube can attach themselves to the floating grid and develop a small charge, typically no more than a few volts. To prove this to you; /archives//html/Amps/2006-07/msg00762.html (10,073 bytes)
36. Re: [Amps] grid fuses (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Fri, 21 Jul 2006 11:04:11 -0400; Bill, See below; ** REPLY SEPARATOR ** No, I agree like I said in another post earlier that this could happen, and equilibrium be obtained. What I cant see is the grid taking on any more charge than; /archives//html/Amps/2006-07/msg00771.html (11,077 bytes)
37. Re: [Amps] grid fuses (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Fri, 21 Jul 2006 11:10:27 -0400; Joe, See below; ** REPLY SEPARATOR ** Oh yes, by 25-30 kV. That from the storage of HV in a CRT from a TV. That's the possible charge between the anode and the aquadag coating. Joe, your not compairi; /archives//html/Amps/2006-07/msg00773.html (10,470 bytes)
38. Re: [Amps] Grid fuses (score: 1): Author: Tony King - W4ZT <amps071806@w4zt.com>; Date: Fri, 21 Jul 2006 14:40:01 -0400; No. The bias is normally derived from the voltage drop across a bias circuit (a zener diode(s), a string of silicon diodes or an adjustable bias circuit) in the cathode current path. When you remove; /archives//html/Amps/2006-07/msg00790.html (11,742 bytes)
39. Re: [Amps] Grid fuses (score: 1): Author: Chris Howard <chris@yipyap.com>; Date: Fri, 21 Jul 2006 12:54:54 -0600; I'll cogitate on that... I guess that is what I was getting at. If grid is hard tied to ground, then arc between cathode--grid could continue even after the plate--grid--cathode arc is done (?). (Dep; /archives//html/Amps/2006-07/msg00791.html (10,697 bytes)
40. Re: [Amps] grid fuses (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Fri, 21 Jul 2006 15:00:12 -0400; You're the one who raised the capacitor issue: The grid can and will become positive in the presence of an electrode stream and voltages on the other electrodes. A screen will certainly go to full an; /archives//html/Amps/2006-07/msg00792.html (10,025 bytes)

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