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61. [Amps] source for big iron (score: 1): Author: "John Lyles" <jtml@losalamos.com>; Date: Sat, 28 Feb 2009 13:16:26 -0700; We have a tendency to always return to the same source for iron. Peter Dahl, for instance - maybe because he advertised in ham pubs. Those of you in major cities,take a look in your telephone book. T; /archives//html/Amps/2009-02/msg00735.html (7,240 bytes)
62. [Amps] plate dissipation and duty factor (score: 1): Author: "John Lyles" <jtml@losalamos.com>; Date: Wed, 11 Mar 2009 23:55:49 -0700; You are correct that RTTY is basically 100% on like FM, at least during a burst of transmission. So this is limited by the average plate dissipation of the tube, not to exceed XXX watts or KW. Therma; /archives//html/Amps/2009-03/msg00339.html (11,649 bytes)
63. [Amps] plate dissipation and duty factor (score: 1): Author: "John Lyles" <jtml@losalamos.com>; Date: Thu, 12 Mar 2009 11:15:11 -0700; If you have a CCS spec for 100 Watts plate dissip (Pd), then don't list plate dissipation going up to 500 watts for unprocessed SSB. Unless you are talking intermittent power to the plate, similar to; /archives//html/Amps/2009-03/msg00351.html (10,173 bytes)
64. [Amps] cathode emission prediction (score: 1): Author: "John Lyles" <jtml@losalamos.com>; Date: Thu, 12 Mar 2009 18:13:30 -0700; Yes, it is available already measured, on the datasheet. Look at the constant current curves on an Eimac sheet, for instance. The top curve is pretty much the peak that they tested in some fashion,; /archives//html/Amps/2009-03/msg00364.html (8,045 bytes)
65. [Amps] TV Transmitters (score: 1): Author: "John Lyles" <jtml@losalamos.com>; Date: Sun, 29 Mar 2009 21:52:51 -0700; I contacted dozens of television stations in a four state area of the southwest last month, about this very idea. Not for ham use, but I have a need for a 20 kW amplifier at 200 MHz, (near Ch 11 high; /archives//html/Amps/2009-03/msg00534.html (8,114 bytes)
66. [Amps] Can someone ID this tube and its use ? (score: 1): Author: "John Lyles" <jtml@losalamos.com>; Date: Wed, 1 Apr 2009 19:05:35 -0700; Jim Tonne, are you sure about Tom Yingst? He was at RCA/Lancaster for years during the development of many tubes, but I thought his tenure at Eimac was shorter and that the Y designations preceeded; /archives//html/Amps/2009-04/msg00024.html (7,860 bytes)
67. Re: [Amps] Can someone ID this tube and its use ? (score: 1): Author: "John Lyles" <jtml@losalamos.com>; Date: Thu, 2 Apr 2009 10:23:38 -0700; My memory agrees with Carl's memory, although I was not around in the early 50s to know first hand. But I have seen Y-tubes that are quite old in various systems. Also, they still sell Y tubes. Jim,; /archives//html/Amps/2009-04/msg00032.html (9,769 bytes)
68. [Amps] Does ANYONE know what the zero signal anode current should be for a pair of 3CPX800A7 tubes? (Don Kessler) (score: 1): Author: "John Lyles" <jtml@losalamos.com>; Date: Sat, 4 Apr 2009 13:03:26 -0700; Don Here is the process to figure this out. Take the tube data sheet for 3CX800A7, available online from G8WRB's site. [http://www.g8wrb.org/triodes/index.php]/ The "P" tube is a pulsed version, us; /archives//html/Amps/2009-04/msg00045.html (10,243 bytes)
69. [Amps] multiple supplies in series (score: 1): Author: "John Lyles" <jtml@losalamos.com>; Date: Sun, 12 Apr 2009 15:53:46 -0600; The Continental supplies do this, and also can switch on and off at 70 Khz or so, so as to be able to recreate audio voltage at the anode of a PA tube.This does high level plate modulation. I'm worki; /archives//html/Amps/2009-04/msg00143.html (8,121 bytes)
70. [Amps] large RF PA and power supply (score: 1): Author: "John Lyles" <jtml@losalamos.com>; Date: Mon, 13 Apr 2009 19:41:13 -0600; The final PA uses a TH628 double ended tetrode in a cavity circuit. It is still in design at present. The power supply will be working soon, charging a 225 uF capacitor bank. Here is a link to the tu; /archives//html/Amps/2009-04/msg00150.html (8,137 bytes)
71. [Amps] big Johnson socket needed (score: 1): Author: "John Lyles" <jtml@losalamos.com>; Date: Fri, 19 Jun 2009 13:28:25 -0600; Does anyone have a EF Johnson 124-214 big jumbo 4 pin socket they can part with? I need one to screw on a base, to showcase my 750TL triode I was given. Wierd that the ol' Eimac catalogs list this lo; /archives//html/Amps/2009-06/msg00082.html (6,782 bytes)
72. [Amps] Gettering 572B (score: 1): Author: John Lyles <jtml@losalamos.com>; Date: Sun, 21 Jun 2009 22:53:52 -0600; What exactly do you mean by the term 'gettering'. I know what a getter is, inside a tube, but I have never heard of being able to getter a tube, i.e., as a verb. If HV was on when you were in standby; /archives//html/Amps/2009-06/msg00091.html (7,753 bytes)
73. Re: [Amps] Gettering 572B (score: 1): Author: John Lyles <jtml@losalamos.com>; Date: Tue, 23 Jun 2009 07:36:57 -0600; Bill Sounds like some internet 'folklore' has become interjected with conditioning of large power tubes. With large tubes, it is imperative to condition them before first use, and if they sit for a l; /archives//html/Amps/2009-06/msg00097.html (12,605 bytes)
74. [Amps] RF 103A plate transformer (score: 1): Author: John Lyles <jtml@losalamos.com>; Date: Fri, 24 Jul 2009 09:24:05 -0600; Since that amplifier uses a conventional choke input filter for the HV power supply, and the DC voltage is marked as 3300 VDC on the schematic, one would assume that the transformer RMS rating is 350; /archives//html/Amps/2009-07/msg00323.html (7,827 bytes)
75. [Amps] PIN diodes and QSK (score: 1): Author: "John Lyles" <jtml@losalamos.com>; Date: Fri, 7 Aug 2009 09:30:28 -0600; Thanks, Lon, k5jv, for the work on PIN diodes that you reported.. Makes me think the same thing, why pay for the $$ diodes if silicon power rectifiers will do? 73 john K5PRO New Mexico ______________; /archives//html/Amps/2009-08/msg00129.html (7,003 bytes)
76. [Amps] parasitic oscillation techniques (score: 1): Author: John Lyles <jtml@losalamos.com>; Date: Sun, 23 Aug 2009 10:15:42 -0600; The discussion of they what, why and how of parasitic suppression has always been controversial on this forum, especially when AG6K was here with his own retrofit kits and QST articles. I think there; /archives//html/Amps/2009-08/msg00410.html (12,609 bytes)
77. [Amps] PL259 connectors for LDF4 Heliax (score: 1): Author: "John Lyles" <jtml@losalamos.com>; Date: Wed, 26 Aug 2009 14:05:01 -0600; I am probably repeating info that was already posted, but I see that RF Industries has a replacement male and female UHF connector for Andrew LDF4-50, and RFS LCF12-50 cables (1/2 inch diameter Helia; /archives//html/Amps/2009-08/msg00512.html (6,994 bytes)
78. [Amps] Tube gain vs frequency (score: 1): Author: "John Lyles" <jtml@losalamos.com>; Date: Thu, 27 Aug 2009 11:14:06 -0600; Alex and Gerald pretty much gave you replies that explained this. Here is more 'free' information. Usually the output circuit is the most difficult to design as you push tubes in Power x Freq. Output; /archives//html/Amps/2009-08/msg00551.html (12,837 bytes)
79. [Amps] Running iron in oil (score: 1): Author: "John Lyles" <jtml@losalamos.com>; Date: Thu, 27 Aug 2009 14:46:26 -0600; At work we have dozens of tanked transformers in use. Being at 7000 feet above sea level, with high voltages, made it a requirement for some systems. They have been running for 40 years this way. We; /archives//html/Amps/2009-08/msg00554.html (8,762 bytes)
80. [Amps] Not the Diacrode (score: 1): Author: "John Lyles" <jtml@losalamos.com>; Date: Thu, 27 Aug 2009 19:38:00 -0600; The Diacrode is a decent high power UHF tube, it is a double-ended tetrode, but it has the same transit time effects as a similar "bottom" circuited tetrode. It merely allows placement in the center; /archives//html/Amps/2009-08/msg00564.html (7,628 bytes)

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