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61. Re: [Amps] 3-500Z glitch resistor (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Tue, 9 Sep 2008 05:09:26 +0000; I tried that with a 2x 4CX250B 2 metre amp - when the fuse blows an arc forms causing the glass to shatter. To compound matters the fuse wire evaporates and deposits itself on the inside of the glas; /archives//html/Amps/2008-09/msg00065.html (9,388 bytes)
62. Re: [Amps] 3-500Z glitch resistor (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Tue, 9 Sep 2008 11:37:16 +0000; But nothing should burn out or need replacing. All you should need to do is press the reset button and the transmitter brings itself back into service. Often this would be fully automatic for operat; /archives//html/Amps/2008-09/msg00070.html (9,809 bytes)
63. Re: [Amps] 3-500Z glitch resistor (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Tue, 9 Sep 2008 15:58:06 +0000; See www.burle.com/cgi-bin/byteserver.pl/pdf/tp105.pdf Regards David G4FTC _________________________________________________________________ Get all your favourite content with the slick new MSN Tool; /archives//html/Amps/2008-09/msg00084.html (8,396 bytes)
64. [Amps] Who said tubes were dead ........ (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Fri, 12 Sep 2008 12:20:20 +0000; It's still reasuring that the new LHC at CERN uses Tetrodes. See https://edms.cern.ch/file/445768/3/Vol3_Chap6_v3.pdf If you want to build your own LHC the full design report is publically available; /archives//html/Amps/2008-09/msg00116.html (7,105 bytes)
65. Re: [Amps] Tetrode amplifiers at LHC (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Tue, 16 Sep 2008 11:31:08 +0000; I noticed the klystons - 48 x 100kw units to produce 4.8MW at 400MHz. I also noticed the cooling arrangements for the ring - liquid helium to maintain the 1.7 Kelvin temperature. If you click on the; /archives//html/Amps/2008-09/msg00153.html (9,086 bytes)
66. Re: [Amps] Meter Face Making (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Thu, 4 Dec 2008 19:24:24 +0000; When I made some meter scales a few years back, I simply scanned the old meter scale using a flatbed scanner, and modified the calibration lettering using Photoshop, but any image editing software s; /archives//html/Amps/2008-12/msg00091.html (8,424 bytes)
67. Re: [Amps] HV wire (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Tue, 23 Dec 2008 05:55:45 +0000; There is a tendency for the foam to compress reducing the effective depth of insulation particularly on bends or in the extreme for the centre conductor to work through the foam insulation. Regards; /archives//html/Amps/2008-12/msg00296.html (8,030 bytes)
68. Re: [Amps] Harris amps (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Thu, 19 Feb 2009 20:41:00 +0000; I have an RF-104 which I use as the main station amplifier. The RF deck is the same as the RF-103 with a single gg 3-1000Z. As standard they don't cover 160m although the 2 to 2.5MHz band position w; /archives//html/Amps/2009-02/msg00575.html (8,862 bytes)
69. Re: [Amps] finding a good blower in Europe? (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Tue, 22 Sep 2009 23:43:12 +0000; I would second ACI - their service is very good. Also I don't think that shaded pole motors will give the power output required to deliver the necessary quantity of air at the required back pressure; /archives//html/Amps/2009-09/msg00263.html (7,951 bytes)
70. Re: [Amps] Teflon power capacitor (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Tue, 16 Mar 2010 18:08:14 +0000; One thing which I have seen done commerically to try and avoid the creation of air bubbles or pockets is to coat the metallic surfaces with a thin coating of silicone grease which then sandwiches th; /archives//html/Amps/2010-03/msg00308.html (9,586 bytes)
71. Re: [Amps] Fan for SB220 (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Fri, 17 Dec 2010 06:47:09 +0000; I'm using one of the Harbach fans on a SB220 - they move a lot more air than the original Heathkit fans. Higher air-flow = higher noise But I can't say I've noticed that it runs hot. Regards David G; /archives//html/Amps/2010-12/msg00179.html (7,585 bytes)
72. Re: [Amps] Fan for SB220 (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Sat, 18 Dec 2010 12:30:43 +0000; Hi All, I've been following this thread, and the one thing that everyone seems to have overlooked is that the critical factor in the operation of a tube such as the 3-500Z is to keep the temperature; /archives//html/Amps/2010-12/msg00198.html (8,665 bytes)
73. Re: [Amps] Adhesive forTeflon sheet.. (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Tue, 22 Mar 2011 06:05:28 +0000; AFAIK, the Loctite range of products are available universally. Have a look at page 31 of the Loctite catalogue. (Beware - its 18Mb in size) http://hybris.cms.henkel.com/medias/sys_master/8470020337; /archives//html/Amps/2011-03/msg00162.html (8,430 bytes)
74. Re: [Amps] ATC capacitors (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Fri, 23 Mar 2012 06:11:32 +0000; Have you tried Down East Microwave? Regards David G4FTC _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2012-03/msg00247.html (6,827 bytes)
75. Re: [Amps] Buzzing transformer (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Mon, 26 Sep 2016 17:19:21 +0000; Hi Carol, If the transformer is getting hot, and I mean so hot that it cannot be touched, then it could be a shorted turn on one of the windings - bad news as it means the transformer is effectively; /archives//html/Amps/2016-09/msg00121.html (9,090 bytes)
76. Re: [Amps] Buzzing Transformer Follow-up Questions (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Tue, 27 Sep 2016 05:46:28 +0000; Hi Carol, The voltages may appear to be OK even if the transformer has a shorted turn. Can you measure the mains primary current without any of the secondaries connected? David G4FTC Hello all... I h; /archives//html/Amps/2016-09/msg00131.html (8,964 bytes)
77. Re: [Amps] Buzzing transformer (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Thu, 29 Sep 2016 05:39:25 +0000; Hi Steve, I agree that any transformer can have a winding replaced, but would it be cost effective, particularly with a small transformer? It would probably be cheaper to buy a new unit. David G4FTC; /archives//html/Amps/2016-09/msg00134.html (9,059 bytes)
78. Re: [Amps] Amplifier for 630 meter band (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Sat, 11 Nov 2017 16:27:00 +0000; Hi All, I see quite a few members of this group asking about exciters, amps, antennas etc, so here goes:- I'm active on 630m, usually WSPR but also JT9 and FT8. I had been active on 136khz and I am b; /archives//html/Amps/2017-11/msg00118.html (15,596 bytes)
79. Re: [Amps] SSR in amp PS not working as expected (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Mon, 7 Jan 2019 10:22:02 +0000; Hi All, I use SSRs as a mains input contactor in three HT PSUs. The SSRs are driven from a monitoring circuit which shuts down the PSU in the event of over drive, excessive currents, etc., being dete; /archives//html/Amps/2019-01/msg00024.html (11,361 bytes)
80. Re: [Amps] SSR in amp PS not working as expected (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Mon, 7 Jan 2019 13:42:10 +0000; I did a google search for the Crydom CSD2525P SSR but I can't find any datasheet - could it be a "special" for some particular application and is incompatible with what you are trying to do? David G4; /archives//html/Amps/2019-01/msg00025.html (10,454 bytes)

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