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61. [AMPS] Amplifier Experiments! (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Sun, 24 May 1998 21:05:50 +0000; To: <amps@contesting.com> Hi Jon, I see many people using resistors they "think" are non-inductive only to find out they aren't. The days of off the shelf higher power non-inductive carbons are gone,; /archives//html/Amps/1998-05/msg00552.html (14,248 bytes)
62. [AMPS] where to find info (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Sun, 24 May 1998 21:05:50 +0000; To: <amps@contesting.com> What Eimac data sheet lists IMD for grounded grid 4-1000A's? The tough part is driving the PA with a clean signal. That takes two exciters with very linear output stages dri; /archives//html/Amps/1998-05/msg00553.html (10,110 bytes)
63. [AMPS] Airflow (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Mon, 25 May 1998 08:22:17 +0000; To: <amps@contesting.com> I just looked at the 3CX800, and it is not one of the tubes with data for reverse cooling. With other tubes, the change in airflow is minor, but there is a slight increase r; /archives//html/Amps/1998-05/msg00559.html (7,657 bytes)
64. [AMPS] Amplifier Experiments! (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Mon, 25 May 1998 17:49:17 +0000; To: <amps@contesting.com> Hi Jon, The saturated current of a 4-1000A is roughly 16 amperes. If the "parasitic" drove the screen and control grids to 1000 volts positive, and the anode was held at a f; /archives//html/Amps/1998-05/msg00568.html (12,109 bytes)
65. [AMPS] Amplifier Experiments! (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Mon, 25 May 1998 17:49:17 +0000; To: <amps@contesting.com> That works well here. Dip meters tell you nothing about impedance. Wrong "tool", and not much of a tool at the very best. That's why they fell out of the mainstream long ago; /archives//html/Amps/1998-05/msg00569.html (9,406 bytes)
66. [AMPS] More amplifier experiments (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Mon, 25 May 1998 17:49:18 +0000; To: <amps@contesting.com> Woops. The shotgun missed the target. Saw the barrel off and shoot again. Ahh, you cut the barrel off. Yes, especially since Rich claims parasitics cause this type of effect; /archives//html/Amps/1998-05/msg00570.html (10,538 bytes)
67. [AMPS] Amplifier Experiments! (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Tue, 26 May 1998 07:46:01 +0000; To: <amps@contesting.com> Hi Jon, Because the result of even the slightest amount of gas is the tube flashes over and conducts very heavily. The tube no longer has to depend on cathode emission, whic; /archives//html/Amps/1998-05/msg00579.html (14,928 bytes)
68. [AMPS] Amplifier Experiments! (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Tue, 26 May 1998 21:33:14 +0000; To: <amps@contesting.com> I don't know. Why does a tire suddenly go flat after 20,000 miles, a filament suddenly open after hundreds of hours, or a person suddenly die after fifty years of life? If y; /archives//html/Amps/1998-05/msg00582.html (10,332 bytes)
69. [AMPS] Amplifier Experiments! (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Wed, 27 May 1998 06:40:50 +0000; To: <amps@contesting.com> Hi Jon, One designed to handle a fault without internal arcing or failure. RCD makes a pulse rated wire wound resistor, and Stackpole makes composition types. Besides dissip; /archives//html/Amps/1998-05/msg00586.html (10,914 bytes)
70. [AMPS] More amplifier experiments (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Thu, 28 May 1998 09:17:03 +0000; To: <amps@contesting.com> The 5 watt metal oxide resistors I have sampled from Mouser are very inductive. Not only that, you have NO control over who's resistors they send you. If anyone knows of a n; /archives//html/Amps/1998-05/msg00599.html (9,724 bytes)
71. [AMPS] Amplifier Experiments! (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Thu, 28 May 1998 09:17:03 +0000; To: <amps@contesting.com> Yes Ohms law. You won't know the phase angle, but you will know the quantity. If you know resistance, source voltage, and voltage across the resistance you can calculate cho; /archives//html/Amps/1998-05/msg00600.html (8,965 bytes)
72. [AMPS] Triode Amp Out/In isolation (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Thu, 28 May 1998 09:17:03 +0000; To: <amps@contesting.com> Oscillations sometimes do, but much more often don't, cause a snap, crackle or pop. How did you measure the S12 or S21? 73, Tom W8JI w8ji.tom@MCIONE.com -- FAQ on WWW: http:; /archives//html/Amps/1998-05/msg00601.html (9,160 bytes)
73. [AMPS] Triode Amp Out/In isolation (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Thu, 28 May 1998 21:24:47 +0000; To: <amps@contesting.com> OK. But keep in mind you can NOT measure phase at these points to determine feedback phase around the tube unless you have a way to allow for phase shift in the tank compone; /archives//html/Amps/1998-05/msg00618.html (10,994 bytes)
74. [AMPS] Triode Amp Out/In isolation (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Thu, 28 May 1998 21:24:47 +0000; To: <amps@contesting.com> Series tuning the grid is a good idea for monoband VHF PA's .' Series tuning the grid increases grid impedance on all other frequencies except the resonant frequency of the; /archives//html/Amps/1998-05/msg00619.html (8,798 bytes)
75. [AMPS] More amplifier experiments (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Fri, 29 May 1998 08:34:59 +0000; To: <amps@contesting.com> About 60 nanohenries at a test frequency of 100 MHz. What is the test frequency and inductance measuring capability of your equipment? Does the "Tek 130" measure and display; /archives//html/Amps/1998-05/msg00635.html (10,248 bytes)
76. [AMPS] More amplifier experiments (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Fri, 29 May 1998 12:40:36 +0000; To: <amps@contesting.com> Think about what we want. We want the resistor to be fully in the circuit at the frequency of instability, and fully out of the circuit at the operating frequency. Now draw; /archives//html/Amps/1998-05/msg00645.html (12,680 bytes)
77. [AMPS] More amplifier experiments (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Fri, 29 May 1998 12:40:36 +0000; To: <amps@contesting.com> I ordered samples today from Mouser, and they did confirm they almost always change the prefix when the vendor is changed. They also confirmed they do not have any spec on t; /archives//html/Amps/1998-05/msg00646.html (11,212 bytes)

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