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41. [Amps] .01 5kv disc capacitor need some (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Sat, 21 Sep 2002 20:15:13 -0500; I bought my last batch from Surplus Sales of Nebraska. They are .01 mfd @ 10 kv. (((73))) Phil, K5PC; /archives//html/Amps/2002-09/msg00165.html (6,516 bytes)
42. [Amps] Tank tweaking (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Sun, 22 Sep 2002 12:09:41 -0500; But... I have been chasing my tail on 160M. The calculated C1 / L / C2 values at 1.9 MHz are 298pF / 25.47 uH / 1708 pF. Actual values are 276 pF / 25.53 uH / 600 pF. Efficiency is off to 48%. The lo; /archives//html/Amps/2002-09/msg00178.html (6,784 bytes)
43. [Amps] Fw: Tank tweaking (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Sun, 22 Sep 2002 12:16:20 -0500; The tune C value is right in line with the calculations (calc'd at 298 pF, actual 285 pF). We need to know what your using for plate load impedance. I expect you are using too much L in the tank. (((; /archives//html/Amps/2002-09/msg00179.html (7,207 bytes)
44. [Amps] Fw: Tank tweaking (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Sun, 22 Sep 2002 23:29:36 -0500; bands? I meant to mention that too..... A 2-30 mhz Bird slug reads several percent low on 1.8 mhz. Your efficiency may be higher than you think! (((73))) Phil, K5PC; /archives//html/Amps/2002-09/msg00198.html (7,293 bytes)
45. [Amps] lookig 4 eimac 8122 (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Sun, 29 Sep 2002 16:21:21 -0500; Several commercial and military amps still use 8122's, so I am sure they are still in stock at tube vendors. My Harris amp uses Burle brand 8122's, and they have an excellent service record here. ((; /archives//html/Amps/2002-09/msg00275.html (6,699 bytes)
46. [Amps] ALPHA 77 (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Sun, 4 Aug 2002 13:01:54 -0500; When I tune an 8877 amp, I tune everything for maximum power out. I then tweak the PA loading cap slightly to give a needle-width decrease on the wattmeter. I need to see the grid current at this ti; /archives//html/Amps/2002-08/msg00055.html (8,695 bytes)
47. [Amps] suppressors (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Sun, 4 Aug 2002 14:45:00 -0500; Hi Carl, Rich, Tom, et al will probably jump on this topic with both feet. They will furnish the technical side, I'm sure, but the practical, layman's side is this: In the early days of glass tubes,; /archives//html/Amps/2002-08/msg00057.html (9,134 bytes)
48. [Amps] Filter (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Mon, 12 Aug 2002 16:29:04 -0500; Winding should be bifilar, but donut style can be used as well as rods. (((73))) Phil, K5PC; /archives//html/Amps/2002-08/msg00119.html (7,624 bytes)
49. [Amps] Filter (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Mon, 12 Aug 2002 18:02:12 -0500; Bifilar is the BEST choke to use in the filament circuit for the following reasons: 1. The ferrite core raises the inductive reactance throughout the HF region so that a minimum of wire is needed, ke; /archives//html/Amps/2002-08/msg00121.html (8,357 bytes)
50. [Amps] digital pics (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Thu, 22 Aug 2002 18:12:50 -0500; Amen, Steve! Now that I am a "full-time" E-Bayer, I have found that a sale can easily be lost by having large and/or hi-res pix in the ads. Also, when E-mailing to some of the el-cheapo providers, y; /archives//html/Amps/2002-08/msg00207.html (7,728 bytes)
51. [Amps] 3-500Z parasitic wows (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Thu, 22 Aug 2002 18:27:04 -0500; original As we all know, most of the amps made before the 90's have little or no protection devices installed, leaving the door wide open for everything from a critter looking for a warm home to an; /archives//html/Amps/2002-08/msg00208.html (9,400 bytes)
52. [Amps] ALPHA 77 SX UPDATE (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Thu, 22 Aug 2002 22:32:04 -0500; I have been there, done that also, Hardy....in addition to your list: The tank circuit was designed for a Q of 10-12 with an anode Z of 2200 ohms. Putting two tubes in lowers the Z to 1200 ohms or s; /archives//html/Amps/2002-08/msg00215.html (9,745 bytes)
53. [Amps] Which 3-500Z (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Wed, 28 Aug 2002 16:39:31 -0500; Prior to sometime in the 1980's, most amp manufacturers specified transformer primary windings for 230 volts. This was the average voltage found in a residence in those days. Now 240-246 volt mains; /archives//html/Amps/2002-08/msg00309.html (7,686 bytes)
54. [Amps] hENRY 2K-3 FAN NOISE (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Wed, 28 Aug 2002 16:42:46 -0500; Have you cleaned the blades really good, and checked to see that they are balanced? The procedure is somewhat akin to balancing a ceiling fan or tire. (((73))) Phil, K5PC; /archives//html/Amps/2002-08/msg00310.html (7,618 bytes)
55. [Amps] ETO Model 70 Amplifier (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Mon, 1 Jul 2002 14:39:54 -0500; The Alpha 70-V, affectionately known as the "Stanley Steamer" because of the vapor-cooled 3CV1500 tube, can be seen @ www.alpha-amps.com/html/legacy.htm along with pix and specs on all the Alpha line; /archives//html/Amps/2002-07/msg00010.html (7,876 bytes)
56. [Amps] choke resonances (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Mon, 1 Jul 2002 15:37:06 -0500; Agreed, Rich... It was truly a piece of cake until the WARC bands came into being. 20-17-15-12-10 meters have such close spacing that it is difficult to produce a choke that will install in any layo; /archives//html/Amps/2002-07/msg00017.html (7,518 bytes)
57. [Amps] RF choke selection (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Tue, 2 Jul 2002 11:46:00 -0500; Hi Chris, Knowing the inductances will help greatly sans your capability to measure in-circuit resonances. Since the original coverage was 2-30 mhz. you can safely assume that the whole choke will wo; /archives//html/Amps/2002-07/msg00048.html (9,088 bytes)
58. [Amps] Bias Zener Diodes In Parallel ? (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Tue, 16 Jul 2002 13:15:06 -0500; Hi Doug, I have been doing for years as Henry and other Commercial amp makers do; I use 50 watt zeners on a heat sink, and have no problems. They are available from R.F. Parts, Henry Radio, And K2IW'; /archives//html/Amps/2002-07/msg00222.html (9,640 bytes)
59. [Amps] Nice big Plate transformer fs++ (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Thu, 18 Jul 2002 11:03:30 -0500; /archives//html/Amps/2002-07/msg00290.html (9,252 bytes)
60. [Amps] Bias Zener Diodes In Parallel ? (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Thu, 18 Jul 2002 22:03:10 -0500; I never found it necessary to "adjust" the bias. I use 50 watt zeners to obtain the correct ZSAC, and it stays there. I use 8 volt units for an 8877 with 2500-3000 volts Ep and a 12 volt unit for 4k; /archives//html/Amps/2002-07/msg00302.html (9,496 bytes)

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