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References: [ +from:jtml@lanl.gov: 562 ]

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101. [AMPS] interested? (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Tue, 15 May 2001 09:33:32 -0600; We are looking for one RF engineer with high power experience and interests. The 'old timers' have retired and I need some assistance! US citizenship (or able to get that) and willingness to live in; /archives//html/Amps/2001-05/msg00290.html (6,976 bytes)
102. [AMPS] 50 Hz power testing (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Mon, 9 Apr 2001 09:31:21 -0600; In mid 1980s the first model for a particular broadcast transmitter that we built was to be sold to the Portuguese. It was for 50 Hz. So we had iron designed for this, and we tested the entire system; /archives//html/Amps/2001-04/msg00200.html (8,007 bytes)
103. [AMPS] plate-->screen arcs in tetrodes (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Mon, 16 Apr 2001 09:29:05 -0600; As a 'daily' user of VHF tetrodes we have witnessed damage from plate to screen arcs in tubes which are being processed to higher average power, as the elements outgas, and the tube cleans up. Those; /archives//html/Amps/2001-04/msg00363.html (9,452 bytes)
104. [AMPS] literature (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Fri, 20 Apr 2001 10:35:43 -0600; I cleaned out my files and have an excess pile of Eimac and RCA tube datasheets and RCA app notes. These cover power tubes from 1951 up to the 1980s and are not complete, just the extra copies I had.; /archives//html/Amps/2001-04/msg00445.html (6,914 bytes)
105. [AMPS] literature all gone (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Fri, 20 Apr 2001 11:38:55 -0600; The power tube data sheets were claimed. Thanks. 73 John K5PRO -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com; /archives//html/Amps/2001-04/msg00446.html (6,337 bytes)
106. [AMPS] 4-400 replacement (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Wed, 25 Apr 2001 14:06:00 -0600; I got home from the NAB convention in Vegas last night. Reading the questions and answers here, I saw someone looking for big coils. Besides Multronics, Phasetek had some nice looking pieces, and com; /archives//html/Amps/2001-04/msg00531.html (7,227 bytes)
107. [AMPS] 4-400 replacement (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Wed, 25 Apr 2001 18:45:32 -0600; Rich and others: Yes, The present Penta Laboratories is based in Chatsworth, CA. They issue a newsletter for NAB each year as a sort of advertising thing. The website is www.pentalabs.com. You can re; /archives//html/Amps/2001-04/msg00534.html (7,756 bytes)
108. [AMPS] metal fabricators for rf decks (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Mon, 5 Mar 2001 08:52:24 -0700; Precison Metal Fabricators, now Proline Metal Fabricators, is a favorite vendors for semi-custom chassis kits around here. You put together whatever size chassis you want, all supplied in nice Irridi; /archives//html/Amps/2001-03/msg00040.html (8,126 bytes)
109. [AMPS] Xray levels (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Mon, 5 Mar 2001 09:52:29 -0700; We see Xrays emitted from tetrodes such as the 4CW250,000B at 28 kVDC. They are very low energy and can be stopped by an aluminum chassis. But they are a problem for an open screened system, where pe; /archives//html/Amps/2001-03/msg00042.html (9,533 bytes)
110. [AMPS] "NEW" reports (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Tue, 20 Mar 2001 11:13:32 -0700; I was sorting through some old Eimac looseleaf binders that I scrounged (from several retiree's trash), and found a 1951 copy of THE CARE AND FEEDING OF POWER TETRODES, Eimac Application Bulletin thi; /archives//html/Amps/2001-03/msg00176.html (7,549 bytes)
111. [AMPS] grounded grids (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Thu, 1 Feb 2001 12:07:04 -0700; Presently I am working on a cathode-driven grounded-grid/grounded-screen tetrode PA for 201 MHz. The cavity is very large, and we (mechanical guy and I) developed a small tuning short that sits betwe; /archives//html/Amps/2001-02/msg00032.html (7,638 bytes)
112. [AMPS] rheostats (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Wed, 7 Feb 2001 09:42:20 -0700; Paul, W9AC, is correct that many of the broadcast rigs in the US that use(d) air-cooled power tubes with handles and thoriated tungsten filaments have/had a rheostat to adjust it. If the rheostat is; /archives//html/Amps/2001-02/msg00178.html (7,622 bytes)
113. [AMPS] rheostats (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Wed, 7 Feb 2001 10:21:29 -0700; Reply to Peter Chadwick: Some of them use a motorized stack of variacs, 9 total, ganged with a driveshaft and chain drive. Three are in parallel per phase of 480 VAC, to handle the 75 amps per phase.; /archives//html/Amps/2001-02/msg00185.html (7,344 bytes)
114. [AMPS] parameter shift in Tetrode (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Tue, 20 Feb 2001 15:39:32 -0700; Regards to the creeping Harris amplifier with 2 x 4CX1500B's: Once I was testing a 4CX1500A tetrode amplifier, class C, 1500 watts output at 100 MHz. My assistant and I left a rag or duct tape over t; /archives//html/Amps/2001-02/msg00280.html (7,595 bytes)
115. [AMPS] HT supplies for 3 phase? (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Sun, 7 Jan 2001 14:38:52 -0700; Dave, G8WRB, inquired about 3 phase HT supplies: Absolutely correct. Much lower ripple, and needs 6 instead of 4 diodes for a full wave bridge rectifier. Yes, 3 phase system is so much better if you; /archives//html/Amps/2001-01/msg00254.html (10,172 bytes)
116. [AMPS] Rf capacitors (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Sun, 7 Jan 2001 15:02:21 -0700; W8NF submitted excellent discussion on ceramic capacitors for RF. Thanks Dave! Those were very useful tips on how to test caps with real circuitry, instead of just trusting some datasheet written for; /archives//html/Amps/2001-01/msg00256.html (8,729 bytes)
117. [AMPS] stable SS amplifiers (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Tue, 9 Jan 2001 09:39:37 -0700; I apologize if I sent this out a month ago and might be repeating it. Memory is one of the first things to go with age right? Damn, need a daily dose of RF.... Polyfet has been making good gold-metal; /archives//html/Amps/2001-01/msg00316.html (7,073 bytes)
118. [AMPS] crowbar (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Tue, 9 Jan 2001 11:27:29 -0700; To build the crowbar for your HT supply, based on a Thyratron as the crowbar element, you should choose a good sensing device, such as a shunt or current transformer. Since the power supply negative; /archives//html/Amps/2001-01/msg00323.html (9,284 bytes)
119. [AMPS] GaAsFet amplifier (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Thu, 11 Jan 2001 08:56:55 -0700; Arne, Thats a Mitsubishi N channel low noise GaAsFet. You won't find it locally nor at most distributors like Newark. Contact one of the RF Parts vendors such as RF Parts, Communications Concepts Inc; /archives//html/Amps/2001-01/msg00336.html (6,815 bytes)
120. [AMPS] DSP, RF (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Thu, 18 Jan 2001 08:28:10 -0700; Hey This forum is getting off amplifiers and rf power, but while you're on the subject of IIR and FIR filters via DSP, there is an excellent text available for free, just download it. Its about 8 Meg; /archives//html/Amps/2001-01/msg00464.html (6,871 bytes)

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