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41. [AMPS] Zener screen supplies (score: 1): Author: 2@vc.net (measures); Date: Mon, 16 Apr 2001 04:36:25 -0700; ? The Eimac outline drawing for the 4cx250B shows a much longer leakage path. ? I have never experienced an external arc, John. "A few mm" appears to be off by a factor of c. 9. cheers - Rich..., 80; /archives//html/Amps/2001-04/msg00359.html (9,322 bytes)
42. [AMPS] Zener screen supplies (score: 1): Author: John_Nelson@compuserve.com (John Nelson); Date: Mon, 16 Apr 2001 09:59:24 -0400; Message text written by measures path.< The Eimac outline drawing (Page 8 of data sheet no 4009 dated 9-1-79) for the 4CX250B/FG does not enumerate this dimension and in any event is rather oversize.; /archives//html/Amps/2001-04/msg00360.html (9,546 bytes)
43. [AMPS] Zener screen supplies (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 16 Apr 2001 10:01:13 +0100; We are talking about power supplies, and the power supply doesn't care where the arc is. Only after you have provided a cathode bypass capacitor and re-wired the entire power supply. Although DC grou; /archives//html/Amps/2001-04/msg00361.html (11,383 bytes)
44. [AMPS] Zener screen supplies (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 16 Apr 2001 09:42:24 +0100; I see what you mean now. Oh, that one... sure, you always need that. I thought you meant another impedance between the screen and the screen supply, which would help to protect the supply. That may w; /archives//html/Amps/2001-04/msg00362.html (11,010 bytes)
45. [AMPS] Zener screen supplies (score: 1): Author: wc6w@juno.com (Radio WC6W); Date: Mon, 16 Apr 2001 08:42:54 -0700; have Good Morning Rich, True, 1500A would not make for a happy gate... but, that is not the case here. I'm guessing to arrive at that figure you have de-installed the glitch R, assumed some perfect p; /archives//html/Amps/2001-04/msg00364.html (10,221 bytes)
46. [AMPS] Zener screen supplies (score: 1): Author: 2@vc.net (measures); Date: Mon, 16 Apr 2001 10:13:18 -0700; tnx, Marv. - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com; /archives//html/Amps/2001-04/msg00365.html (8,624 bytes)
47. [AMPS] Zener screen supplies (score: 1): Author: 2@vc.net (measures); Date: Mon, 16 Apr 2001 10:13:19 -0700; (I did not write:) ? The "entire power supply"? The screen power supply connects between the cathode (-) and the screen (+). This is true in either case. ? RE: Figure 5. The screen current meter is; /archives//html/Amps/2001-04/msg00366.html (11,716 bytes)
48. [AMPS] Zener screen supplies (score: 1): Author: 2@vc.net (measures); Date: Mon, 16 Apr 2001 10:13:21 -0700; ? By subtracting, the length of the anode insulator may be arrived at. ? No crispy-crittered cockroaches visable in socket. No arc-marks on ceramic. good point, John - Rich..., 805.386.3734, www.vcn; /archives//html/Amps/2001-04/msg00367.html (9,782 bytes)
49. [AMPS] Zener screen supplies (score: 1): Author: 2@vc.net (measures); Date: Mon, 16 Apr 2001 10:13:22 -0700; 5w zeners are cheap enough. I have never had a string short in a screen regulator. cheers - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submi; /archives//html/Amps/2001-04/msg00368.html (10,314 bytes)
50. [AMPS] Zener screen supplies (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 16 Apr 2001 15:12:45 +0100; Enough of these non-standard units! The last time I used the arc method to measure the length of the gap on a 4CX250, it was 1.0 earwig. 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice'; /archives//html/Amps/2001-04/msg00369.html (9,906 bytes)
51. [AMPS] Zener screen supplies (score: 1): Author: John_Nelson@compuserve.com (John Nelson); Date: Mon, 16 Apr 2001 14:39:34 -0400; Message text written by measures Using Eimac's letter nomenclature, please indicate which dimension(s) is (are) to be subtracted from which to derive the "length of the anode insulator". 73 John GW4F; /archives//html/Amps/2001-04/msg00370.html (8,980 bytes)
52. [AMPS] Zener screen supplies (score: 1): Author: 2@vc.net (measures); Date: Mon, 16 Apr 2001 13:03:43 -0700; ? Two needed dimensions are left out. I would reach for my machinist's scale. - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps; /archives//html/Amps/2001-04/msg00371.html (9,101 bytes)
53. [AMPS] Zener screen supplies (score: 1): Author: John_Nelson@compuserve.com (John Nelson); Date: Mon, 16 Apr 2001 17:01:58 -0400; Message text written by measures scale. < Indeed. But you originally stated: which is incorrect. The external anode-screen insulator in a small 4CX has a path length of about 7mm. Flashovers can and; /archives//html/Amps/2001-04/msg00372.html (9,548 bytes)
54. [AMPS] Zener screen supplies (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 16 Apr 2001 20:28:39 -0400; I've drawn a few arcs with my hands, but like Rich I've never arced inside either. Tetrodes are a different story. They do arc inside on occasion, for the same t reasons triodes and other vacuum tub; /archives//html/Amps/2001-04/msg00373.html (9,067 bytes)
55. [AMPS] Zener screen supplies (score: 1): Author: 2@vc.net (measures); Date: Mon, 16 Apr 2001 18:09:08 -0700; Do you suspect that I might already be aware of this? 7mm is abour 1/4". The insulator looks wider to me. cheers, John - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.; /archives//html/Amps/2001-04/msg00374.html (9,218 bytes)
56. [AMPS] Zener screen supplies (score: 1): Author: wc6w@juno.com (Radio WC6W); Date: Mon, 16 Apr 2001 20:54:54 -0700; Hi Rich, Well, I've never had a string short either... mostly because I've never used that method. I do protect the screen cap, in the socket on my 4CX1500, with varistors, since that part is worth m; /archives//html/Amps/2001-04/msg00375.html (9,882 bytes)
57. [AMPS] Zener screen supplies (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 17 Apr 2001 07:57:33 +0100; One point about the spark gap surge arrestors is that the breakdown voltage is dependent upon the rise time of the applied voltage. For example, the 90volt Siemens types used for protecting telephone; /archives//html/Amps/2001-04/msg00377.html (9,912 bytes)
58. [AMPS] Zener screen supplies (score: 1): Author: John_Nelson@compuserve.com (John Nelson); Date: Tue, 17 Apr 2001 04:22:14 -0400; Message text written by measures Many people have the grace to acknowledge errors when they make them. Irrelevant and hedging. I suggest you measure it rather than relying on how it "looks". 73 John; /archives//html/Amps/2001-04/msg00380.html (9,059 bytes)
59. [AMPS] Zener screen supplies (score: 1): Author: John_Nelson@compuserve.com (John Nelson); Date: Tue, 17 Apr 2001 05:33:23 -0400; Message text written by Peter Chadwick My guess is that he knows perfectly well but is more interested in trolling than anything else. Hence the high incidence of what psychotherapists call 'crossed; /archives//html/Amps/2001-04/msg00381.html (9,309 bytes)
60. [AMPS] Zener screen supplies (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 17 Apr 2001 11:03:10 +0100; Incidentally, whatever the advantages or disadvantages of using zener diodes to regulate the screen, if you are going to drive an amp from a TS2000, it wouldn't appear to matter what you do from the; /archives//html/Amps/2001-04/msg00382.html (9,763 bytes)

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