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Total 28 documents matching your query.

1. Re: [Amps] 50 watt stud mount zener diodes (score: 1)
Author: "David C. Hallam" <dhallam@knology.net>
Date: Wed, 11 Aug 2010 10:03:19 -0400
It's good that NTE can still supply them if needed, but their prices take you breath away. David KW4DH -- There are four boxes to use in defense of Liberty: SOAP, BALLOT, JURY AND AMMO. Please use in
/archives//html/Amps/2010-08/msg00142.html (8,121 bytes)

2. Re: [Amps] 50 watt stud mount zener diodes (score: 1)
Author: "David C. Hallam" <dhallam@knology.net>
Date: Wed, 11 Aug 2010 13:02:44 -0400
That sounds pretty expensive to me, especially if you plan to use a string of them in a HV regulator, z.B., tetrode screen regulator. David KW4DH -- There are four boxes to use in defense of Liberty:
/archives//html/Amps/2010-08/msg00149.html (8,905 bytes)

3. Re: [Amps] Pulse tuning (score: 1)
Author: "David C. Hallam" <dhallam@knology.net>
Date: Thu, 23 Sep 2010 08:13:07 -0400
What about pulse tuning using a two tone signal? David KW4DH -- There are four boxes to use in defense of Liberty: SOAP, BALLOT, JURY AND AMMO. Please use in that order. VOTE for REAL CHANGE in 2010,
/archives//html/Amps/2010-09/msg00275.html (10,861 bytes)

4. Re: [Amps] Pulse tuning (score: 1)
Author: "David C. Hallam" <dhallam@knology.net>
Date: Thu, 23 Sep 2010 08:45:30 -0400
I use a pulsed two tone generator built from a 1970's QST article. It generates two tones of about 1800 and 850 Hz. The pulsing comes from an unfiltered half wave rectification of the AC line. David
/archives//html/Amps/2010-09/msg00277.html (12,070 bytes)

5. Re: [Amps] copper vs steel /SS /brass conductors in a HF tank circuit (score: 1)
Author: "David C. Hallam" <dhallam@knology.net>
Date: Wed, 23 Mar 2011 13:21:09 -0400
The addition of nickel changes the crystal structure from body center cubic to face centered cubic. That's why the 300 series are nonmagnetic and can not be heat treated. David KW4DH -- I bring reaso
/archives//html/Amps/2011-03/msg00178.html (10,547 bytes)

6. Re: [Amps] copper vs steel /SS /brass conductors in a HF tank circuit (score: 1)
Author: "David C. Hallam" <dhallam@knology.net>
Date: Thu, 24 Mar 2011 12:42:04 -0400
Silver oxide is slightly conductive but not by very much. Depending upon where you live and what fuel you use to heat your house and cook with, the black tarnish on silver is more likely to be silver
/archives//html/Amps/2011-03/msg00187.html (11,275 bytes)

7. Re: [Amps] 813 Amplifier Article (score: 1)
Author: "David C. Hallam" <dhallam@knology.net>
Date: Thu, 31 Mar 2011 12:19:01 -0400
Strangely enough, the 4E27 and the 4E27A were two completely different tubes. The 27 is a tetrode and the 27A is a pentode with greater dissipation. They are not interchangeable. At one time I ran a
/archives//html/Amps/2011-03/msg00301.html (12,751 bytes)

8. Re: [Amps] 4-400 Amp Help (score: 1)
Author: "David C. Hallam" <dhallam@knology.net>
Date: Thu, 31 Mar 2011 16:08:55 -0400
Have you measured the RF voltage on the grid when you apply drive? David KW4DH -- "No man should escape our universities without knowing how little he knows." J. Robert Oppenheimer __________________
/archives//html/Amps/2011-03/msg00307.html (8,333 bytes)

9. Re: [Amps] Picture tubes (score: 1)
Author: "David C. Hallam" <dhallam@knology.net>
Date: Wed, 11 May 2011 18:39:07 -0400
I wish we had some of the 1960's color TV. They were an excellent source of power transformers. David KW4DH -- "I predict future happiness for Americans if they can prevent the government from wastin
/archives//html/Amps/2011-05/msg00063.html (11,196 bytes)

10. Re: [Amps] Should a blower run after amp shutdown? (score: 1)
Author: "David C. Hallam" <dhallam@knology.net>
Date: Fri, 03 Jun 2011 08:01:46 -0400
Does running the blower after shut down apply to a tube like the 4CX1500A [5V @ 42A]? I don't see any thing about that in the Eimac spec sheet. I've wondered about that for the amp I am building. I h
/archives//html/Amps/2011-06/msg00016.html (14,834 bytes)

11. Re: [Amps] Dummy load varying R (score: 1)
Author: "David C. Hallam" <dhallam@knology.net>
Date: Thu, 09 Jun 2011 07:56:31 -0400
Has anyone tested or had any experience with the Rig Expert AA-54 antenna analyzer? How does it compare to the MJF 259B? I recently purchased one after deciding on it over the 259? I like the graphic
/archives//html/Amps/2011-06/msg00111.html (13,791 bytes)

12. Re: [Amps] Using an oil capacitor (score: 1)
Author: "David C. Hallam" <dhallam@knology.net>
Date: Sun, 19 Jun 2011 11:09:42 -0400
Pulse rated oil capacitors must be derated for use for a linear power supply use. 2/3 might be safe but 1/2 is better. David KW4DH -- "I predict future happiness for Americans if they can prevent the
/archives//html/Amps/2011-06/msg00238.html (8,518 bytes)

13. Re: [Amps] FW: 4cx5000J for $75 NOS-correction (score: 1)
Author: "David C. Hallam" <dhallam@knology.net>
Date: Sun, 24 Jul 2011 18:31:57 -0400
eBay sellers can no longer give negative or neutral feedback. It's been that way for about a year. They can only give positive or no feedback. David KW3DH -- "I predict future happiness for Americans
/archives//html/Amps/2011-07/msg00296.html (10,523 bytes)

14. Re: [Amps] Anbody still repair meters? (score: 1)
Author: "David C. Hallam" <dhallam@knology.net>
Date: Wed, 14 Sep 2011 09:55:51 -0400
Carl, Try, Eldad Benary The Sound Company 129 George Sickle Road Saugerties, NY 12477 845 246-2466 eldad@hvc.rr.com I have had him repair meters for me. David KW4DH On 9/14/2011 9:32 AM, Carl wrote:
/archives//html/Amps/2011-09/msg00089.html (7,975 bytes)

15. [Amps] Cooling Fan (score: 1)
Author: "David C. Hallam" <dhallam@knology.net>
Date: Mon, 26 Sep 2011 15:32:22 -0400
I am trying to find a 120mm cooling fan for one of my amps. I would like to duplicate what I have on another one. It is very quite and moves sufficient air for my purpose. This fan is an IMD Boxer Mo
/archives//html/Amps/2011-09/msg00226.html (7,434 bytes)

16. Re: [Amps] Need spec for Jennins type U (score: 1)
Author: "David C. Hallam" <dhallam@knology.net>
Date: Mon, 14 Nov 2011 07:07:26 -0500
I have an old Jennings vacuum variable catalog but it lists only the peak test voltage. For a type U it can be anywhere from 3 to 60KV. There should be a number following the capacitance number that
/archives//html/Amps/2011-11/msg00057.html (8,723 bytes)

17. [Amps] Sweep Tube Amps (score: 1)
Author: "David C. Hallam" <dhallam@knology.net>
Date: Tue, 22 Nov 2011 17:25:25 -0500
First of all, don't tell me to get a real amplifier. I have other "real" amps. My question is: 3 sweep tube types are stated to be equivalent, 6JE6, 6LQ6, and 6ML6. Are they really interchangeable in
/archives//html/Amps/2011-11/msg00113.html (7,192 bytes)

18. Re: [Amps] 4-400 W Screen Voltage (score: 1)
Author: "David C. Hallam" <dhallam@knology.net>
Date: Sun, 29 Jan 2012 15:24:27 -0500
I have built several passive grid driven tetrode amps with normal screen voltage applied. One was with 4-400's and the other a 4CX1500A. I currently use a Johnson Invader 2000 which is a passive grid
/archives//html/Amps/2012-01/msg00269.html (9,754 bytes)

19. Re: [Amps] every db lost re Tubes vs. Solid State (score: 1)
Author: "David C. Hallam" <dhallam@knology.net>
Date: Tue, 01 May 2012 16:33:07 -0400
I realize that the investment of a proper crimping tool and dies for UHF is an investment of not insignificant proportions. But compared to the investment in a modern SS transceiver, it's a small pri
/archives//html/Amps/2012-05/msg00028.html (11,888 bytes)

20. Re: [Amps] filament instant heating query / simple remedy (score: 1)
Author: "David C. Hallam" <dhallam@knology.net>
Date: Sun, 17 Jun 2012 08:40:47 -0400
Has anyone tried an approach like Carel, PC5M, with a microprocessor controlled soft start for the filament. The microprocessor controls an optical triac driver The triac is turned on and off over an
/archives//html/Amps/2012-06/msg00219.html (9,334 bytes)

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