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References: [ +from:4cx250b@miamioh.edu: 327 ]

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41. Re: [Amps] Keying Kenwood TL922 with Yaesu FT1000D (both old guys) (score: 1): Author: "Jim Garland" <4cx250b@miamioh.edu>; Date: Sat, 19 Oct 2013 14:35:07 -0600; I'm not quite following this, Bryan. Unless I've dropped a factor somewhere (always a possibility!) or misunderstood the circuit (also a possibility), a .02uF capacitance charged to 120V has a stored; /archives//html/Amps/2013-10/msg00342.html (12,770 bytes)
42. Re: [Amps] Keying Kenwood TL922 with Yaesu FT1000D (both old guys) (score: 1): Author: "Jim Garland" <4cx250b@miamioh.edu>; Date: Sat, 19 Oct 2013 15:15:00 -0600; Wrong Jim, Bryan! You're respondeing to W8ZR, not W7RY! I think I put the text of my msg under W7RY's header in his earlier msg, instead of ahead of it. Sorry! Jim W8ZR _____ Hi Jim, I got a larger n; /archives//html/Amps/2013-10/msg00345.html (14,116 bytes)
43. Re: [Amps] We usually put a 33 Ohm resistor in series with the capacitor in these cases. (where relay contacts discharge a capacitor) (score: 1): Author: "Jim Garland" <4cx250b@miamioh.edu>; Date: Sat, 19 Oct 2013 20:45:40 -0600; A .02 uF capacitor discharging through a 33 ohm resistor has a time constant of less than a microsecond. That isn't long enough to arrest any sparking that results from the stored charge on the capac; /archives//html/Amps/2013-10/msg00349.html (7,612 bytes)
44. [Amps] HV fuses (score: 1): Author: "Jim Garland" <4cx250b@miamioh.edu>; Date: Thu, 24 Oct 2013 17:58:13 -0600; Out of curiousity, I bought several 900 mA/5 KV fuses from an eBay Chinese supplier. They arrived today. They fit fine into 3AG fuse clips, but are about 50% longer. Internally they have a spring con; /archives//html/Amps/2013-10/msg00423.html (7,110 bytes)
45. Re: [Amps] HV fuses (score: 1): Author: MU 4CX250B <4cx250b@miamioh.edu>; Date: Thu, 24 Oct 2013 23:48:40 -0600; It didn't sound right to me either, Bill. The seller provided no data sheets other then claiming a 900 mA/5kV rating for the fuses. I think they were intended for microwave ovens, but am not sure. As; /archives//html/Amps/2013-10/msg00425.html (9,016 bytes)
46. Re: [Amps] 4CX1000A project (score: 1): Author: "Jim Garland" <4cx250b@miamioh.edu>; Date: Mon, 28 Oct 2013 08:47:13 -0600; There are Chinese SHV connectors for sale on eBay that are very inexpensive ($4/ea). I've bought a bunch of them and they're quite nice. They're reverse polarity type (make plug is in the chassis con; /archives//html/Amps/2013-10/msg00435.html (11,468 bytes)
47. [Amps] Hardline connectors wanted (score: 1): Author: "Jim Garland" <4cx250b@miamioh.edu>; Date: Tue, 5 Nov 2013 07:30:35 -0700; I'm looking for one or (preferably) two connectors for 50 ohm 1/2 inch hardline - the CATV type, with a solid 1/8 in (approx) copper inner conductor, solid aluminum tube for a shield and an outer vin; /archives//html/Amps/2013-11/msg00049.html (6,631 bytes)
48. Re: [Amps] Best source for Gigavac GH-1 ? (score: 1): Author: MU 4CX250B <4cx250b@miamioh.edu>; Date: Sat, 9 Nov 2013 18:44:12 -0700; Is the gigavac GH1 the clone of the Jennings RJ1a or kilovac HC1? if so, either of those would be an acceptable and possibly superior substitute. The bigger question is why you have had to replace th; /archives//html/Amps/2013-11/msg00185.html (8,427 bytes)
49. Re: [Amps] Best source for Gigavac GH-1 ? (score: 1): Author: "Jim Garland" <4cx250b@miamioh.edu>; Date: Sun, 10 Nov 2013 07:58:21 -0700; Interesting discussion, re vacuum relay failure modes. I've zapped two RJ-1a relays over the years, but both times it was my fault. The first time was in the 1980s, when I used one as an HV interrupt; /archives//html/Amps/2013-11/msg00210.html (14,593 bytes)
50. Re: [Amps] Best source for Gigavac GH-1 ? (score: 1): Author: MU 4CX250B <4cx250b@miamioh.edu>; Date: Sun, 10 Nov 2013 09:25:04 -0700; Very interesting experiment with the RF-1D, Larry. I may try the same life test with an RJ1a to see how it holds up. Incidentally, I did test an RF 1D earlier this year and found it to be surprisingl; /archives//html/Amps/2013-11/msg00215.html (13,920 bytes)
51. Re: [Amps] Best source for Gigavac GH-1 ? (score: 1): Author: "Jim Garland" <4cx250b@miamioh.edu>; Date: Mon, 11 Nov 2013 06:47:04 -0700; Jim, You've asked a very reasonable question. In many cases, when one is certain RF will not arrive at the input of an amplifier until the amplifier is ready to receive it, then relay sequencing is g; /archives//html/Amps/2013-11/msg00238.html (13,097 bytes)
52. [Amps] blower advice? (score: 1): Author: "Jim Garland" <4cx250b@miamioh.edu>; Date: Wed, 4 Dec 2013 10:01:54 -0700; I have an usued Rotron blower, model 4140-00-853-2138, with a Series 331AS motor, that I've built into a new homebrew amplifier. The blower, which I've had for years, is perfectly matched to three GU; /archives//html/Amps/2013-12/msg00025.html (7,575 bytes)
53. Re: [Amps] PARALLEL CAPS IN OUTPUT (score: 1): Author: MU 4CX250B <4cx250b@miamioh.edu>; Date: Fri, 6 Dec 2013 12:37:12 -0700; I have always thought that for lengths much less than a wavelength, the impedance looking into a transmission line is dominated by the impedance of the load connected to the end of the line. The char; /archives//html/Amps/2013-12/msg00054.html (9,549 bytes)
54. Re: [Amps] "N" Connector (score: 1): Author: "Jim Garland" <4cx250b@miamioh.edu>; Date: Sun, 29 Dec 2013 16:13:06 -0700; I've had bad experience with N connectors on long runs of coax in the wintertime. My theory, unsupported either by other facts or long deliberation is that the coax length shrinks slightly at low tem; /archives//html/Amps/2013-12/msg00171.html (16,119 bytes)
55. Re: [Amps] Ā Runaway Plate Current (score: 1): Author: "Jim Garland" <4cx250b@miamioh.edu>; Date: Mon, 30 Dec 2013 09:29:49 -0700; I've not given it a lot of thought, but I'd think a cathode resistor in a tetrode amplifier may be problemmatic. A residual cathode current (near cutoff) through a large cathode resistor lifts the ca; /archives//html/Amps/2013-12/msg00186.html (8,991 bytes)
56. Re: [Amps] negative screen current (score: 1): Author: "Jim Garland" <4cx250b@miamioh.edu>; Date: Mon, 30 Dec 2013 12:00:14 -0700; I?ve heard this explanation before but don?t understand it. If electrons are captured by the screen grid, then that corresponds to current flowing into the screen grid from the external circuitry (i.; /archives//html/Amps/2013-12/msg00191.html (10,164 bytes)
57. [Amps] negative screen current (score: 1): Author: "Jim Garland" <4cx250b@miamioh.edu>; Date: Mon, 30 Dec 2013 16:36:16 -0700; Kerry, Your explanation about secondary emission seems reasonable, except for the idea that electrons ?caught? by the screen correspond to a negative screen current. Unless I?m grossly mistaken (alwa; /archives//html/Amps/2013-12/msg00200.html (12,611 bytes)
58. Re: [Amps] negative screen current (score: 1): Author: "Jim Garland" <4cx250b@miamioh.edu>; Date: Mon, 30 Dec 2013 19:46:31 -0700; Peter, I may have misunderstood yout comment, and if so I apologize, but if not then I believe you are harboring a misconception about charges and current flow. Electrons always have a negative charg; /archives//html/Amps/2013-12/msg00215.html (18,276 bytes)
59. [Amps] K8RA SK (score: 1): Author: MU 4CX250B <4cx250b@miamioh.edu>; Date: Thu, 2 Jan 2014 16:37:37 -0700; I know you will be sad to learn that Jerry Pittenger K8RA, one of the nation's premier amplifier builders, became a silent key at 5:04 pm EST, from pancreatic cancer. 73, Jim W8ZR Sent from my iPhone; /archives//html/Amps/2014-01/msg00011.html (6,217 bytes)
60. Re: [Amps] Russian HV Supply Capacitors (score: 1): Author: MU 4CX250B <4cx250b@miamioh.edu>; Date: Thu, 9 Jan 2014 15:18:14 -0700; I agree with Bill. The Soviet caps are very heavy duty and conservatively rated. I use a 50 uF/5kV version that looks identical and like it very much. I also agree that this one is overpriced, and th; /archives//html/Amps/2014-01/msg00041.html (8,994 bytes)

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