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Total 102 documents matching your query.

81. Re: [Amps] Ameritron Amps (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 31 Jul 2006 18:41:12 +0100; It's not whether it increases but by how much as a percentage and to what value in absolute terms. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://l; /archives//html/Amps/2006-07/msg01443.html (9,863 bytes)
82. Re: [Amps] Ameritron Amps (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Mon, 31 Jul 2006 11:23:18 -0400; Peter, That glass sounds like the older glass some TV CRT's were made of way back in time (40's-50"s?). The glass was really thick and had a light green color to it. Whether it's the same or not is a; /archives//html/Amps/2006-07/msg01449.html (9,777 bytes)
83. Re: [Amps] Ameritron Amps (score: 1): Author: R L Measures <r@somis.org>; Date: Mon, 31 Jul 2006 07:10:57 -0700; chortle. El Cheapo caps with lots of ESR, operating at the ragged edge with normal mains V can probably be expected to buried with the operator, or even before. Also, operating electrolytics even sli; /archives//html/Amps/2006-07/msg01452.html (12,188 bytes)
84. Re: [Amps] Ameritron Amps (score: 1): Author: R L Measures <r@somis.org>; Date: Mon, 31 Jul 2006 07:16:59 -0700; A small hole was near the anode stem. There was no indication of excessive heat on the sides. Had the glass softened from anode IR radiation, would not the sides of the glass have softened a bit?. R; /archives//html/Amps/2006-07/msg01453.html (9,564 bytes)
85. Re: [Amps] Ameritron Amps (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 01 Aug 2006 07:18:51 +0100; Is there any form of manufacturing defect, or damage, which could account for what happened? Rich, please clarify: Are we talking about an Eimac 3-500Z? Who witnessed this happen? Did it happen more; /archives//html/Amps/2006-08/msg00000.html (6,992 bytes)
86. Re: [Amps] Ameritron Amps (score: 1): Author: Gudguyham@aol.com; Date: Tue, 1 Aug 2006 03:12:01 EDT; The best capacitor in the world would have failed the same way with bad resistors. Don't blame the capacitor when everyone else (including your buddy and whoever was helping him) didn't do what commo; /archives//html/Amps/2006-08/msg00001.html (6,831 bytes)
87. Re: [Amps] Ameritron Amps (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 01 Aug 2006 16:19:07 +0100; The topology is straightforward enough, not so the idea that one topology won't give high dissipation, the other won't give high voltage. Steve _______________________________________________ Amps ma; /archives//html/Amps/2006-08/msg00002.html (9,042 bytes)
88. Re: [Amps] Ameritron Amps (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 01 Aug 2006 16:52:41 +0100; OK - I'll speculate it's a manufacturing flaw in the envelope, you speculate that it's a parasitic oscillation working on some magic glass, and we'll agree to differ. Steve __________________________; /archives//html/Amps/2006-08/msg00006.html (8,505 bytes)
89. Re: [Amps] Ameritron Amps (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Tue, 1 Aug 2006 13:40:57 -0400; If that is true I wonder why tubes in push-pull amplifiers don't blow up, why the output of a PP amp isn't zero, why a push-pull self excited oscillator is easily possible to build and why it works; /archives//html/Amps/2006-08/msg00010.html (9,373 bytes)
90. Re: [Amps] Ameritron Amps (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 02 Aug 2006 11:36:27 +0100; Unless I've been labouring under a misapprehension, the melting was attributed to a vhf parasitic rather than normal hf operation. I reckon that glass which changes its loss so much between those fre; /archives//html/Amps/2006-08/msg00041.html (10,084 bytes)
91. Re: [Amps] Ameritron Amps (score: 1): Author: R L Measures <r@somis.org>; Date: Wed, 2 Aug 2006 03:08:03 -0700; With push-pull VHF oscillation in a paralleled 2-tube HF/MF amplifier, even though VHF energy can not escape through the low-pass tank, the tubes conduct alternately, so the energy from one tube alte; /archives//html/Amps/2006-08/msg00043.html (10,707 bytes)
92. Re: [Amps] Ameritron Amps (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sat, 05 Aug 2006 07:40:21 +0100; Sure, but that's change in frequency of x400,000, not x4. How does nylon do at 200Hz? Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesti; /archives//html/Amps/2006-08/msg00171.html (8,638 bytes)
93. Re: [Amps] Ameritron Amps (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sat, 5 Aug 2006 06:00:17 -0400; The only commercial amplifier using those tubes changed to a nichrome suppressor and continued to have the same problem with the same tube source. That means either the parasitic thing was wrong, or; /archives//html/Amps/2006-08/msg00177.html (9,163 bytes)
94. Re: [Amps] Ameritron Amps (score: 1): Author: PA3DUV <pa3duv@planet.nl>; Date: Sun, 06 Aug 2006 17:57:36 +0200; Polycarbonate seems to perform well at both low and high frequencies. @ 1.2 kW input in my center loaded mobile vertical the Lexan loading coil tube with internal helix groove where the coil wire is; /archives//html/Amps/2006-08/msg00209.html (10,194 bytes)
95. Re: [Amps] Ameritron Amps (score: 1): Author: R L Measures <r@somis.org>; Date: Sun, 6 Aug 2006 05:25:11 -0700; Ni-Cr wire (resistance wire) suppressors work to lower VHF-Q the same way that Cu wire suppressors do, the difference is that since resistance wire adds R it additionally lowers VHF-Q. This allows a; /archives//html/Amps/2006-08/msg00215.html (10,326 bytes)
96. Re: [Amps] Ameritron Amps (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sun, 6 Aug 2006 14:37:48 -0400; Almost all "problems" with dielectrics come from use in capacitors or insulation applications with concentrated electric fields in high-impedance areas. I can't understand why people seem to keep ri; /archives//html/Amps/2006-08/msg00223.html (9,184 bytes)
97. Re: [Amps] Ameritron Amps (score: 1): Author: PA3DUV <pa3duv@planet.nl>; Date: Sun, 06 Aug 2006 22:48:09 +0200; The loading coil of my HiQ 5-160 centerloaded vertical has an impedance of 10 + J 3494 ohms @ 1200 watt (f=1.9 MHz) input at the antenna feedpoint the voltage over the loading coil is 29 910 volt and; /archives//html/Amps/2006-08/msg00230.html (9,678 bytes)
98. Re: [Amps] Ameritron Amps (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 07 Aug 2006 10:28:06 +0100; RL is the effective or equivalent resistance between the anode and ground? Gain is inversely proprtional to RL? Steve _______________________________________________ Amps mailing list Amps@contesting; /archives//html/Amps/2006-08/msg00245.html (9,258 bytes)
99. Re: [Amps] Ameritron Amps (score: 1): Author: R L Measures <r@somis.org>; Date: Mon, 7 Aug 2006 06:01:39 -0700; Do you see corona, Dick? R L MEASURES, AG6K. 805-386-3734 r@somis.org _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinf; /archives//html/Amps/2006-08/msg00254.html (10,880 bytes)
100. Re: [Amps] Ameritron Amps (score: 1): Author: R L Measures <r@somis.org>; Date: Mon, 7 Aug 2006 06:23:17 -0700; Yes, however, the anode sees two RLs, one at the HF tank's design frequency and another RL at the anode's VHF self-resonance. My mistake. Tnx, Steve. Higher VHF Q in the parasitic suppressor means hi; /archives//html/Amps/2006-08/msg00255.html (10,513 bytes)

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