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61. [AMPS] Re: PS diode equalizing (score: 1): Author: measures@vc.net (Rich Measures); Date: Wed, 7 Jul 1999 02:07:09 -0700; ? For my last amplifier project, I wanted to save space over using block rectifiers and heatsinks, so I decided to use individual diodes mounted on G10 perfboard. . Using a HV breakdown tester, I so; /archives//html/Amps/1999-07/msg00121.html (9,757 bytes)
62. [AMPS] Re: PS diode equalizing (score: 1): Author: measures@vc.net (Rich Measures); Date: Wed, 7 Jul 1999 03:00:47 -0700; ? The supply has worked flawlessly for ten years even though the safety factor is paltry. ? Hughes Electronics was reportedly using resistance-wire/ribbon VHF parasitic suppression in a 100kW HF amp; /archives//html/Amps/1999-07/msg00123.html (8,917 bytes)
63. [AMPS] 4CX10000 (score: 1): Author: measures@vc.net (Rich Measures); Date: Thu, 8 Jul 1999 08:39:39 -0700; hello, Alek ? A good price if they have ok emission, Alek. However, on the subject of good manners, contesting's dirty little secret is that there are some top contestors who use the 4CX10,000D in co; /archives//html/Amps/1999-07/msg00134.html (9,281 bytes)
64. [AMPS] 4cx10000 (score: 1): Author: measures@vc.net (Rich Measures); Date: Thu, 8 Jul 1999 10:20:42 -0700; Many times. Each rebuild is good for 20k-hours if one runs the proper filament voltage. Rich... R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures -- FAQ on WWW: http://www.contesting.com/am; /archives//html/Amps/1999-07/msg00144.html (7,646 bytes)
65. [AMPS] 4CX10000 (score: 1): Author: measures@vc.net (Rich Measures); Date: Thu, 8 Jul 1999 10:20:44 -0700; ? I ran mine from a 100a single-phase service with 40a slow blow breakers for the amplifier feed. I tuned up with a tuning pulser. When I tuned up, my neighbor's porchlight pulsed. A resonant-choke; /archives//html/Amps/1999-07/msg00145.html (9,170 bytes)
66. [AMPS] 4cx10000 (score: 1): Author: measures@vc.net (Rich Measures); Date: Thu, 8 Jul 1999 19:51:44 -0700; ? The metal/ceramic bond is silver-solder. The anode can be unsoldered as easily as it is soldered. Rich... R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures -- FAQ on WWW: http://www.conte; /archives//html/Amps/1999-07/msg00152.html (8,848 bytes)
67. [AMPS] RE: 4cx10000 (score: 1): Author: measures@vc.net (Rich Measures); Date: Fri, 9 Jul 1999 07:19:54 -0700; ? In Class A, IMD is probably below 50db down. In AB1, they are still cleaner than most radios. For perfectionists, there are the ultralinear "J" versions. ? Good points, Jan E.. Does 0.91 db (1850w; /archives//html/Amps/1999-07/msg00156.html (11,188 bytes)
68. [AMPS] RE: 4cx10000 (score: 1): Author: measures@vc.net (Rich Measures); Date: Fri, 9 Jul 1999 14:23:58 -0700; ? Amen. How about a splatter-homing smart-bomb, Roger?. Rich... R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@cont; /archives//html/Amps/1999-07/msg00162.html (8,272 bytes)
69. [AMPS] Power Output (was 4cx10000) (score: 1): Author: measures@vc.net (Rich Measures); Date: Fri, 9 Jul 1999 14:24:00 -0700; ? 0.91db is less than one-sixth of one S-unit. individual worthwhile. Amen. When I was a kid, I heard "you have to hear 'em to work 'em". Now it's possible to hear weak ones on a telephone line, eit; /archives//html/Amps/1999-07/msg00163.html (8,156 bytes)
70. [AMPS] Re: Power Output (was 4cx10000) (score: 1): Author: measures@vc.net (Rich Measures); Date: Fri, 9 Jul 1999 14:24:03 -0700; ? alas, Dick -- to some it does not seem to matter. One contester told me it was ok to run 3kw out because so and so runs 10kw out. . ? In a 75m or 160m group discussion, directional antennas are a; /archives//html/Amps/1999-07/msg00164.html (13,598 bytes)
71. [AMPS] Alpha 77SX Meter Indications (score: 1): Author: measures@vc.net (Rich Measures); Date: Fri, 9 Jul 1999 21:27:20 -0700; I would test the tubes on a HV breakdown tester to determine if the tubes or the amplifier is the problem. Rich... R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures -- FAQ on WWW: http://ww; /archives//html/Amps/1999-07/msg00170.html (7,532 bytes)
72. [AMPS] RE: 4cx10000 (score: 1): Author: measures@vc.net (Rich Measures); Date: Sat, 10 Jul 1999 06:27:47 -0700; ? Tom - - How can grid bias regulation be a problem when the grid current is zero? ? good point ? amen ? So don't take suggestions from tetrode amplifiers. ? true. However, a pair of properly loaded; /archives//html/Amps/1999-07/msg00175.html (10,202 bytes)
73. [AMPS] RE: 4cx10000 (score: 1): Author: measures@vc.net (Rich Measures); Date: Sat, 10 Jul 1999 09:25:14 -0700; ? In practice, a bit of inadvertent grid current does not appear to cause cutoff bias. ? What are you using for bypasses, 0.47F? ? Of course, none of this happens if the operator adjusts the grid vo; /archives//html/Amps/1999-07/msg00179.html (11,366 bytes)
74. [AMPS] RE: 4cx10000 (score: 1): Author: measures@vc.net (Rich Measures); Date: Sat, 10 Jul 1999 13:06:55 -0700; spike. What is ? Not for those who design their AB1 input configuration for their particular transceiver. ? Unlike the 4cx600JA and 4cx1500B, the 4cx250B is not designed for minimal grid interceptio; /archives//html/Amps/1999-07/msg00184.html (9,415 bytes)
75. [AMPS] AL1500 help needed! (score: 1): Author: measures@vc.net (Rich Measures); Date: Sun, 11 Jul 1999 06:12:39 -0700; A used amplifier that has been used very little not infrequently has a little problem. AL-1500s have a reputation for frequent 8877 replacement. I know of one AL-1500 that has had seven replacement; /archives//html/Amps/1999-07/msg00190.html (9,886 bytes)
76. [AMPS] Ameritron AL-80 upgrade (score: 1): Author: measures@vc.net (Rich Measures); Date: Sun, 11 Jul 1999 06:43:17 -0700; ? As I understand it, the vhf suppressor has not been improved because the designer is convinced that there has never been a case of one that oscillated. // See Figure 15 on my Web site. . If you ar; /archives//html/Amps/1999-07/msg00191.html (7,763 bytes)
77. [AMPS] AL82 vs AL1200 (score: 1): Author: measures@vc.net (Rich Measures); Date: Sun, 11 Jul 1999 10:37:27 -0700; ? I have seen many 3-500Zs that suddenly shorted due to bent filament helices after a semi-mysterious "big-bang". .. However, bent filaments are rare with 3CX1200A7s - even though big-bangs are not.; /archives//html/Amps/1999-07/msg00193.html (7,638 bytes)
78. [AMPS] Loading/linearity (score: 1): Author: measures@vc.net (Rich Measures); Date: Mon, 12 Jul 1999 08:33:16 -0700; To: <amps@contesting.com> ? indeed, Steve. In other words, by reducing RL (heavier loading), the swing in instantaneious anode potential is limited to the most linear region, so minimal distortion r; /archives//html/Amps/1999-07/msg00209.html (7,783 bytes)
79. [AMPS] Ameritron AL-80 upgrade (score: 1): Author: measures@vc.net (Rich Measures); Date: Mon, 12 Jul 1999 08:33:20 -0700; ? Only when there is collateral evidence. The good news is that what appears to be parasite damage in single 3-500Z amplifiers (such as the AL-80 .series and SB-1000) is less common than it is 2, 3-; /archives//html/Amps/1999-07/msg00210.html (8,532 bytes)
80. [AMPS] SB220 problem (score: 1): Author: measures@vc.net (Rich Measures); Date: Mon, 12 Jul 1999 09:13:47 -0700; ? Did the bad bandswitch resemble the toasted bandswitch shown on p.33 in the Oct. 1990 issue of *QST*? ? If the parasitic suppressors are short on L-sup, they may not reduce the gain of the tubes f; /archives//html/Amps/1999-07/msg00211.html (8,760 bytes)

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