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Total 1109 documents matching your query.

81. Re: [Amps] Roller inductor & wiper "grease"" (score: 1)
Author: "Roger" <sub1@rogerhalstead.com>
Date: Mon, 26 Nov 2007 05:11:33 -0500
Although I see comments about using conductive grease, after working in industry of over 26 years I never use conductive grease particularly for wipers and coils on ceramic forms. The non conductive
/archives//html/Amps/2007-11/msg00370.html (16,244 bytes)

82. Re: [Amps] Conductive Grease (score: 1)
Author: "Roger" <sub1@rogerhalstead.com>
Date: Mon, 26 Nov 2007 09:12:15 -0500
I use "Moly" for bearings in rotators as well as Hardwood thrust bearings. 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contestin
/archives//html/Amps/2007-11/msg00374.html (8,023 bytes)

83. Re: [Amps] 220V wiring logistics (score: 1)
Author: "Roger" <sub1@rogerhalstead.com>
Date: Wed, 28 Nov 2007 20:25:01 -0500
As you can't drill any holes (don't know the reason but that's unimportant), how about running a 220 line to one of the existing outlets and replacing the duplex outlet with a 220? That's assuming y
/archives//html/Amps/2007-11/msg00393.html (8,353 bytes)

84. Re: [Amps] Tranformer Suppliers (score: 1)
Author: "Roger" <sub1@rogerhalstead.com>
Date: Fri, 7 Dec 2007 20:59:11 -0500
Hardwood blocks make good forms. It just depends on how much automation you want to use. I've seen this done using a vacuum cleaner and a metal chamber. You don't need a high vacuum. Just enough so
/archives//html/Amps/2007-12/msg00053.html (9,343 bytes)

85. Re: [Amps] High voltage rectifiers for Henry 3K (score: 1)
Author: "Roger" <sub1@rogerhalstead.com>
Date: Sun, 23 Dec 2007 23:13:43 -0500
Those molded rectifiers are just a string of high voltage diodes, resistors and bypass caps in a molding compound. If you really want to make one, just use some plaster of paris and use the original
/archives//html/Amps/2007-12/msg00225.html (7,872 bytes)

86. Re: [Amps] High voltage rectifiers for Henry 3K (score: 1)
Author: "Roger" <sub1@rogerhalstead.com>
Date: Mon, 24 Dec 2007 17:09:27 -0500
Butcher? You can make one that looks just like the original and matches the specs with a little effort and maybe $10 to $15, but it does require familiarity with making molds and working with resins
/archives//html/Amps/2007-12/msg00233.html (8,831 bytes)

87. Re: [Amps] Amps] High voltage rectifiers for Henry 3K (score: 1)
Author: "Roger" <sub1@rogerhalstead.com>
Date: Mon, 24 Dec 2007 19:06:11 -0500
And a 440 into an old roadster is considered a "custom" job worth far more than the original.<:-)) There are a couple of places out in Ca that do this sort of thing for a hundred grand and up. They
/archives//html/Amps/2007-12/msg00239.html (10,492 bytes)

88. Re: [Amps] 2x813 or 2x3-500zg ? (score: 1)
Author: "Roger" <sub1@rogerhalstead.com>
Date: Mon, 31 Dec 2007 03:32:29 -0500
My personal opinions: The 813 is a nice tube and I have built amps using them. However the 3-500Z is a current tube, in production, and not outlandishly priced. As far as as a matched pair, I've neve
/archives//html/Amps/2007-12/msg00282.html (8,150 bytes)

89. Re: [Amps] HV Supplies and Diodes (score: 1)
Author: "Roger" <sub1@rogerhalstead.com>
Date: Wed, 2 Jan 2008 21:20:10 -0500
Neither. It's History and background. Most of the current crop of hams have been around long enough that's "the way things were" and unless a person keeps current they will still tend to think in th
/archives//html/Amps/2008-01/msg00022.html (10,950 bytes)

90. Re: [Amps] INTERFACING IC-746 with Amp Supply LA-1000 amp (score: 1)
Author: "Roger" <sub1@rogerhalstead.com>
Date: Mon, 7 Jan 2008 02:46:38 -0500
My 756 Pro which I'm going to assume is similar to the 746 will key both my Tokyo Hy Power 1.5Kfx and my old Henry 2K-4, but it will not key my Alpha 76. For that I had to add the solid state relay i
/archives//html/Amps/2008-01/msg00071.html (8,023 bytes)

91. Re: [Amps] 160-6 Amp (score: 1)
Author: "Roger" <sub1@rogerhalstead.com>
Date: Tue, 8 Jan 2008 19:07:06 -0500
Too bad the 4-CX1600B is no longer available. Even "The Handbook" still has circuits using it although I don't think they had one that covered the whole range at one time. Roger (K8RI). _____________
/archives//html/Amps/2008-01/msg00079.html (7,688 bytes)

92. Re: [Amps] 3 kV switch mode supply (score: 1)
Author: "Roger" <sub1@rogerhalstead.com>
Date: Thu, 10 Jan 2008 17:37:12 -0500
It seems as if there was a complete amp designed for portable use in QST within the last year or two. Switching PS and used an 8877 IIRC although I'm not positive about the tube. 73 and good luck, R
/archives//html/Amps/2008-01/msg00093.html (7,531 bytes)

93. Re: [Amps] 3CX1500C7 Tubes and Socket on eBay (score: 1)
Author: "Roger" <sub1@rogerhalstead.com>
Date: Sun, 13 Jan 2008 16:32:01 -0500
That tube would sure make one whale of a 2-meter amp compared to my litle 3CX-800. <:-)) Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com http://lis
/archives//html/Amps/2008-01/msg00109.html (7,074 bytes)

94. Re: [Amps] tuning bandpass filters (score: 1)
Author: "Roger" <sub1@rogerhalstead.com>
Date: Mon, 21 Jan 2008 14:43:14 -0500
Are these the output filters such as the ones used on the Henry 2002A, or are they between the exciter and amp? Roger (K8RI) _______________________________________________ Amps mailing list Amps@con
/archives//html/Amps/2008-01/msg00134.html (7,870 bytes)

95. Re: [Amps] re dishtronix amp (score: 1)
Author: "Roger" <sub1@rogerhalstead.com>
Date: Tue, 22 Jan 2008 13:32:19 -0500
When you look at the prices of the other amps, 1.5Kfx = $3,300, 2.5 Kfx = $5,600 plus auto tuner = $1,150 you get $4450 for about 1100 PEP or $6750 for the legal limit. The SPE ran about the same wi
/archives//html/Amps/2008-01/msg00143.html (10,205 bytes)

96. Re: [Amps] MLA-2500 (score: 1)
Author: "Roger" <sub1@rogerhalstead.com>
Date: Fri, 25 Jan 2008 13:09:57 -0500
I might as well add my opinions here too. <:-)) I had a MLA-2500 for several years. Actually I had quite a few of their amps while they were in business and although I didn't much care for the power
/archives//html/Amps/2008-01/msg00183.html (10,341 bytes)

97. [Amps] What we're missing in the sunspot cycle (score: 1)
Author: "Roger Halstead" <sub1@rogerhalstead.com>
Date: Mon, 28 Jan 2008 23:21:20 -0500
Most seem to be looking forward to the next cycle upswing and peak. I too look forward to seeing world wide openings on 6-meters and getting some use out of the old tri-bander, BUT "wold wide" commun
/archives//html/Amps/2008-01/msg00255.html (7,751 bytes)

98. Re: [Amps] commercial amplifier cooling (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Thu, 14 Feb 2008 17:57:28 -0500
If you want extra air and have the room, and don't require the back pressure, go with low RPM 120 mm fans. The new computer systems are doing this, moving more air, better cooling, and very low noise
/archives//html/Amps/2008-02/msg00097.html (8,415 bytes)

99. Re: [Amps] SB-220 w/5 3-500 (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Fri, 22 Feb 2008 17:54:41 -0500
Wellll... Tis true one would be hard pressed to call metal working one of his strong points <LOL> OTOH it isn't all that neat inside either. Roger (K8RI) _____________________________________________
/archives//html/Amps/2008-02/msg00156.html (8,532 bytes)

100. [Amps] OT Looking for Alinco DR-610T parts/Reflector (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Sun, 24 Feb 2008 15:13:07 -0500
I've been searching for an active Alinco reflector but no luck so far. I need the two circuit boards that go in the control head, or a complete control head (small board broke off the larger one in m
/archives//html/Amps/2008-02/msg00173.html (6,901 bytes)

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