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81. [AMPS] Hand in pocket test (score: 1): Author: k7fm@teleport.com (Lamb); Date: Fri, 12 Oct 2001 22:51:44 -0700; With the warnings about hands in the power supply, let me tell you a story about my younger days (age 15, 40 years ago) I was measuring the length of a zip cord to wire to a switch which was surface; /archives//html/Amps/2001-10/msg00319.html (8,088 bytes)
82. [AMPS] SB-221 High Voltage Transformer (score: 1): Author: k7fm@teleport.com (Lamb); Date: Sat, 13 Oct 2001 17:27:54 -0700; Son-in-law lost high voltage xfmr in his sb221 Question: How could he lose it? That seems to be pretty irresponsible. -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.co; /archives//html/Amps/2001-10/msg00330.html (7,275 bytes)
83. [AMPS] Choke input PS question (score: 1): Author: k7fm@teleport.com (Lamb); Date: Mon, 22 Oct 2001 06:20:20 -0700; When using a large filter choke in my hv power supply, I experienced 2 problems. First, the collapsing field blew the diodes out. Second, there were resonances that caused problems at certain current; /archives//html/Amps/2001-10/msg00426.html (8,428 bytes)
84. [AMPS] Choke input PS question (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Mon, 22 Oct 2001 08:19:53 -0700; Rich: The adverse qualities of the power supply choke can be alleviated by shunting it with some nichrome wire. 73, Colin K7FM -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@cont; /archives//html/Amps/2001-10/msg00433.html (8,292 bytes)
85. [AMPS] Henry 1KD5 Rectifier question (score: 1): Author: k7fm@teleport.com (Lamb); Date: Wed, 31 Oct 2001 05:40:11 -0800; I have also heard that dc on the filaments causes migration. It makes sense. However, practicall experience leads me to question whether the conclusion may not be relevant. My old GE Progress Line 2; /archives//html/Amps/2001-10/msg00503.html (9,440 bytes)
86. [AMPS] 4CX800 Idle Current a bit high (score: 1): Author: k7fm@teleport.com (Lamb); Date: Wed, 31 Oct 2001 06:23:30 -0800; Peter is right on. Since the grid takes very little current, a poteniometer is used to adjust the bias voltage to the exact voltage. Usually you will have a higher negative voltage that is tapped by; /archives//html/Amps/2001-10/msg00507.html (7,600 bytes)
87. [AMPS] 813 amp (score: 1): Author: k7fm@teleport.com (Lamb); Date: Sun, 2 Sep 2001 08:03:50 -0700; I had a 3 x 813 amp for a few years on 75 meters. Never had a problem with it. Ran 800 watts out with 2500 volts on plate. Was unbreakable. Used a muffin fan for cooling. Worked 135 countries on 75.; /archives//html/Amps/2001-09/msg00011.html (7,415 bytes)
88. [AMPS] True Or Not True #2 (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Thu, 6 Sep 2001 12:19:19 -0700; Rich asked "On HF/MF skywave, is a 58% increase in power out (2db) noticable at the Rx end?" That all depends upon how you define noticeable. If your s-meter is sitting at S-9, and assuming that 6 db; /archives//html/Amps/2001-09/msg00079.html (8,387 bytes)
89. [AMPS] Voltage Doubler / Filter Capacitance Question (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Thu, 20 Sep 2001 14:08:16 -0700; Hi Kurt: There is a point of diminishing return for filter capacitance. The Orr chart is real simple to use. For serious use, transformers must be specially designed for voltage doubler circuits. Thi; /archives//html/Amps/2001-09/msg00379.html (8,189 bytes)
90. [AMPS] IMD stats grounded anode 8877? (score: 1): Author: k7fm@teleport.com (Lamb); Date: Wed, 26 Sep 2001 20:27:37 -0700; Question: "can anyone tell me about the IMD stats on a grounded anode 8877 I'm working on?" This is a trick question, like the ones given by the college prof. Looking at it from the input side, disto; /archives//html/Amps/2001-09/msg00429.html (7,173 bytes)
91. [AMPS] G3RZP (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Fri, 28 Sep 2001 14:06:06 -0700; Why was Peter competing with the cat for the shrew? Cats are better than people at cat-ching shrews, so Peter should have just stayed out of the way. Does his cat play with radios? Peter can still ma; /archives//html/Amps/2001-09/msg00481.html (7,753 bytes)
92. [AMPS] Tetrode poor IMD performance (score: 1): Author: k7fm@teleport.com (Lamb); Date: Wed, 15 Aug 2001 22:15:58 -0700; While not claiming to know the answer to Tom's question, I would like to add some information using a similar tetrode. The 4CX1000 was originally not designed for linear amplifier service. Eimac spec; /archives//html/Amps/2001-08/msg00147.html (8,098 bytes)
93. [AMPS] Tetrode poor IMD performance (score: 1): Author: k7fm@teleport.com (Lamb); Date: Thu, 16 Aug 2001 09:02:58 -0700; "It seems a bit doubtful that the 4CX1000A has c. 100-times as much 3rd order distortion as a 4CX1500B" The data I mentioned regarding the 4CX1000 and the 4CX1500 comes from: Care and Feeding of Powe; /archives//html/Amps/2001-08/msg00158.html (9,493 bytes)
94. [AMPS] 14KW (score: 1): Author: k7fm@teleport.com (Lamb); Date: Thu, 16 Aug 2001 14:49:35 -0700; "DX'ers are a weird bunch...you work all your adult life to build and maintain a formidable station, fill several shoe boxes with QSL cards and put awards on the wall. Then you die; some local buys y; /archives//html/Amps/2001-08/msg00164.html (8,391 bytes)
95. [[AMPS] Tetrode poor IMD performance ] (score: 1): Author: k7fm@teleport.com (Lamb); Date: Thu, 16 Aug 2001 15:01:54 -0700; "It seems a bit doubtful that the 4CX1000A has c. 100-times as much 3rd order distortion as a 4CX1500B" The data I mentioned regarding the 4CX1000 and the 4CX1500 comes from: Care and Feeding of Powe; /archives//html/Amps/2001-08/msg00165.html (8,849 bytes)
96. [AMPS] Making tubes (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Thu, 5 Jul 2001 09:36:40 -0700; This is a multi-part message in MIME format. --=_NextPart_000_0009_01C10535.FE53E0C0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Aha, the true ham spiri; /archives//html/Amps/2001-07/msg00058.html (16,658 bytes)
97. [AMPS] Home Brew Tubes (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Thu, 5 Jul 2001 14:13:12 -0700; This is a multi-part message in MIME format. --=_NextPart_000_000D_01C1055C.A06CCEA0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable As long as you are goin; /archives//html/Amps/2001-07/msg00065.html (10,684 bytes)
98. [AMPS] Home Brew Tubes (score: 1): Author: k7fm@teleport.com (Lamb); Date: Fri, 6 Jul 2001 05:10:48 -0700; Hi Billy: Actually, I have been looking for a negatively charged vacuum mine for a project of my own. With the new demands for frequency, I believe there is a tremendous potential in advancing the en; /archives//html/Amps/2001-07/msg00076.html (7,609 bytes)
99. [AMPS] Tuned input (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Mon, 9 Jul 2001 12:49:45 -0700; Hi Jan: In a cathode driven amplifier, there are significant reasons to use a tuned input. First, less drive is required. Secondly, there is a slight decrease in distortion products (3 to 5 db typica; /archives//html/Amps/2001-07/msg00120.html (8,033 bytes)
100. [AMPS] Tuned input (score: 1): Author: k7fm@teleport.com (Lamb); Date: Mon, 9 Jul 2001 20:26:01 -0700; "This requires a network close to the tube with a low impedance presented to the tube at high frequencies (a "T " won't do the job, and neither will a network some distance from the amplifier)." In a; /archives//html/Amps/2001-07/msg00124.html (8,652 bytes)

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