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Total 138 documents matching your query.

81. Re: [Amps] Safety grounding - was Mains Isolation Transformer (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Mon, 3 Jul 2006 12:37:41 -0400
I have a Johnson Viking Invader 2000 TX. The power supply is on a separate chassis from the RF section. In the PS, Johnson used the chassis as the neutral for the low voltage transformers, etc. (driv
/archives//html/Amps/2006-07/msg00112.html (11,460 bytes)

82. Re: [Amps] GS35 144MHz amp faileur, how should we test it.....? (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Wed, 5 Jul 2006 09:33:29 -0400
I'm sure this isn't what you want to hear, but I sold 2 2C39A's and 3 sockets on eBay about 3 weeks ago. David KC2JD Were there ever any? I can't say I've ever heard of the existence of socket for th
/archives//html/Amps/2006-07/msg00215.html (8,602 bytes)

83. Re: [Amps] Grid fuses (was: Life and gain of 3-500Z) (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Fri, 21 Jul 2006 14:20:04 -0400
There is a world of difference between the fusing or fault protecting an anode or fusing a grid. Fusing a grid for faults is about as wise as fusing the neutral of a power line. 73 Tom Jeeze, let's n
/archives//html/Amps/2006-07/msg00785.html (10,168 bytes)

84. Re: [Amps] setting the grid adrift (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Wed, 26 Jul 2006 10:25:56 -0400
I know that Celtron made a line of rectifier tubes such as 3B28. I have a pair of them in my Invader 2000 PS. David KC2JD --Original Message-- From: amps-bounces@contesting.com [mailto:amps-bounces@c
/archives//html/Amps/2006-07/msg01176.html (8,974 bytes)

85. [Amps] HP 410B VTVM (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Sat, 29 Jul 2006 11:42:34 -0400
I am trying to locate a tip and spring for a EA53 diode used in the 410B VTVM. It is HP part number 410B-21P on the parts list. As far as I know this is the same part number 1460-0006 as used in the
/archives//html/Amps/2006-07/msg01302.html (6,498 bytes)

86. Re: [Amps] HV transformers I want to series primaryandparallelsecondary (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Fri, 18 Aug 2006 21:33:22 -0400
Now you've got me worried. I am building an amp using a 4CX1500A and didn't have a filament transformer that would supply 5V at 42A but I do have 2 identical 25A transformers. Am I going to run into
/archives//html/Amps/2006-08/msg00551.html (10,860 bytes)

87. Re: [Amps] Passive Grid Resistor Source? (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Tue, 22 Aug 2006 07:59:58 -0400
Lee, I use carborundum resistors (now made by Kanthal Globar) in my designs. They are available in various wattages. Here in the US they show up regularly at ham fests. The under chassis air flow fro
/archives//html/Amps/2006-08/msg00589.html (8,484 bytes)

88. Re: [Amps] Stolen Radio (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Tue, 22 Aug 2006 14:42:23 -0400
Is eBay going to pull the auction? David KC2JD Item # 220019921045 is stolen property. I am the lawful owner. Sorry for the interruption Mike k1ern _______________________________________________ Amp
/archives//html/Amps/2006-08/msg00606.html (7,117 bytes)

89. Re: [Amps] Heat Paint (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Mon, 28 Aug 2006 13:06:01 -0400
Do a Google search for Tempil. They make temperature indicating paints and crayons among other things. Don't know about prices. David KC2JD Can someone give me a source for the paint that changes col
/archives//html/Amps/2006-08/msg00739.html (7,823 bytes)

90. Re: [Amps] 8877 Longetivity (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Sun, 28 Jan 2007 14:50:46 -0500
At the risk of starting another long thread, I will ask a question. Given the relative low accuracy of normal AC panel meters, how can you be sure that you are actually within the filament voltage to
/archives//html/Amps/2007-01/msg00296.html (8,407 bytes)

91. Re: [Amps] power supply transformer (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Wed, 31 Jan 2007 12:43:07 -0500
Commercial ham gear did the same thing in the past. Look at some Johnson schematics for their old transmitters. Others did it, too. David KC2JD/4 _______________________________________________ Amps
/archives//html/Amps/2007-01/msg00344.html (9,158 bytes)

92. Re: [Amps] power supply transformer (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Wed, 31 Jan 2007 13:26:28 -0500
No it wasn't safe at all. I did not mean to imply that it was, only that commercial manufacturers were/are guilty of unsafe practices, too. David KC2JD/4 --Original Message-- From: Peter Chadwick [ma
/archives//html/Amps/2007-01/msg00346.html (8,901 bytes)

93. Re: [Amps] Halli HT-41 amp (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Tue, 27 Mar 2007 13:30:51 -0400
Install the capacitors you have. You will never know the difference. As far as 120VAC line goes, while there would be plus to have 240AVC input on the transformer, the 7094's don't run enough power t
/archives//html/Amps/2007-03/msg00368.html (9,060 bytes)

94. Re: [Amps] Halli HT-41 amp (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Sat, 31 Mar 2007 13:20:48 -0400
Tom, Tubes are a problem with the old Hallicrafters amps, not cheap. Have you searched for a something similar in a more available tube for a conversion? David KC2JD/4 tionTips.aspx?icid=HMMartagline
/archives//html/Amps/2007-03/msg00418.html (13,518 bytes)

95. Re: [Amps] QRO-stuff (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Thu, 24 May 2007 11:01:29 -0400
I can't answer your questions, but if it is the transaction fee charged to the seller by PayPal, it is my understanding that eBay will not accept listings where the buyer has to reimburse the seller
/archives//html/Amps/2007-05/msg00195.html (8,917 bytes)

96. Re: [Amps] higher v.?? (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Wed, 25 Jul 2007 12:03:33 -0400
There must have been some improvements in CFL's recently. We have a light fixture in the den that has 4 bulbs. Our line voltage runs about 126V and I was replacing incandescent bulbs at the rate of 1
/archives//html/Amps/2007-07/msg00429.html (12,762 bytes)

97. Re: [Amps] FW: economics 3501 (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Sun, 29 Jul 2007 08:19:19 -0400
Come On! You don't seriously think pumping a few barrels of oil into our strategic reserve had anything to do with the current price of oil. Sure, the demand for oil is up all over the world but the
/archives//html/Amps/2007-07/msg00499.html (13,224 bytes)

98. Re: [Amps] FW: economics 3501 (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Sun, 29 Jul 2007 08:59:25 -0400
In Florida once your taxes are established at the assessed value (sale price) of the house, they can not be increased more than 3% per year regardless of any increased value or change in the mil rate
/archives//html/Amps/2007-07/msg00504.html (9,646 bytes)

99. Re: [Amps] 4cx1500b amp conversion (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Mon, 27 Aug 2007 08:44:30 -0400
The 4CX1500B is not a tube suited for use in a grounded grid configuration. It works very successfully in the grid driven mode if you use a passive grid input, ground the screen, and float the screen
/archives//html/Amps/2007-08/msg00209.html (8,601 bytes)

100. Re: [Amps] Amphenol Connectors made in China (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Wed, 29 Aug 2007 15:08:27 -0400
I shudder to think what will happen when Chinese made cars start arriving at your local friendly Chevrolet dealer about next year. Remember the Yugo. David KC2JD/4 ___________________________________
/archives//html/Amps/2007-08/msg00236.html (11,799 bytes)

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