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21. [Amps] RF Chokes (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Sun, 30 Jan 2005 15:31:25 -0500
After reading the posts on the subject of RF chokes over last few days, I guess I am going to have to go back to the drawing board. I am in final stages of completing a continuous tuning 3.5 to 30 MH
/archives//html/Amps/2005-01/msg00620.html (7,256 bytes)

22. Re: [Amps] Fwd: Pi-L In-circuit Adjustment Question (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Wed, 23 Feb 2005 19:36:11 -0500
All of this has been "informative", but I had planned to do the following with the tank circuit of my amplifier under construction: Replace the tube with a noninductive resistor of a value equal to t
/archives//html/Amps/2005-02/msg00701.html (12,438 bytes)

23. Re: [Amps] Shipping Damage (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Thu, 24 Feb 2005 11:35:04 -0500
My wife and I sell on eBay. Over the past few years, I have had to file a number of claims and found UPS fairly easy to deal with about shipping damage. You need some documentation to substantiate th
/archives//html/Amps/2005-02/msg00739.html (8,454 bytes)

24. Re: [Amps] close to off topic - how to read antenna R + jX ?? (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Sun, 27 Feb 2005 11:06:38 -0500
You can also use a Boonton Model 250A RX meter or one of the later models of the 250A made by HP after they took over Boonton. They appear on eBay fairly regularly and seem to sell for prices in the
/archives//html/Amps/2005-02/msg00891.html (10,734 bytes)

25. Re: [Amps] Magnet wire stripper (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Sun, 27 Feb 2005 12:11:53 -0500
I don't know. Did anyone consider just getting the solderable kind that you don't have to strip? That's what I do. David KC2JD dudes This is what I do at work to strip magnet type wire using a newer
/archives//html/Amps/2005-02/msg00897.html (8,610 bytes)

26. Re: [Amps] close to off topic - how to read antenna R + jX ?? (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Sun, 27 Feb 2005 14:07:00 -0500
Admittedly you need a little more math than 1st year high school algebra, but it's not all that daunting. You also need to be able to navigate through the Smith chart. On top of that, it's fun just t
/archives//html/Amps/2005-02/msg00907.html (14,078 bytes)

27. Re: [Amps] close to off topic - how to read antenna R + jX ?? (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Sun, 27 Feb 2005 14:30:23 -0500
I guess my typing got ahead of my brain. Of course you mean inductive reactance at 220MHz. There will be very little change in inductance with frequency unless there is a permeable material in or ver
/archives//html/Amps/2005-02/msg00910.html (15,511 bytes)

28. [Amps] 5CX1500A Sockets (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Wed, 23 Mar 2005 11:11:59 -0500
Several days ago someone made a post (I'm not even sure it was on this reflector and I accidentally deleted the posting) asking if a SK-840 socket for the 5CX1500A could be utilized with a 4CX1000A o
/archives//html/Amps/2005-03/msg00524.html (7,133 bytes)

29. Re: [Amps] Bleeder Resistor Inquiry (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Sun, 24 Apr 2005 12:24:09 -0400
If I read Mike's original post correctly, he stated that he held the voltage to 4KV with his variac. Therefore, he should have had 40 mA draw by the bleeder resistor which is equal to 160W dissipatio
/archives//html/Amps/2005-04/msg00482.html (9,900 bytes)

30. Re: [Amps] No more HP/Agilent manuals on BAMA (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Mon, 25 Apr 2005 09:26:33 -0400
HP and Agilent are not the same companies. HP sold (or formed a new separate company) their electronic and test equipment business to Agilent and now is exclusively a computer manufacturer. In any ev
/archives//html/Amps/2005-04/msg00522.html (9,346 bytes)

31. Re: [Amps] Fw: failure notice (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Mon, 20 Jun 2005 09:29:31 -0400
Well, just to keep this thread going; In the case of UPS, I was told at our local (Pinellas Park, FL) UPS distribution center that an item must be packaged securely enough that it will with stand a f
/archives//html/Amps/2005-06/msg00160.html (21,837 bytes)

32. Re: [Amps] Nuclear Magnetic Pulses (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Mon, 1 Aug 2005 20:29:51 -0400
If that happens, your equipment will be the least of your worries. David C. Hallam KC2JD Sirs (and Ladies, of course), Mention was made in recent posts about EMP. Other than lightning damage, which c
/archives//html/Amps/2005-08/msg00024.html (7,997 bytes)

33. Re: [Amps] Metric system (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Thu, 4 Aug 2005 18:16:11 -0400
And then there's that wonderful measure of velocity furlongs per fortnight. David C. Hallam KC2JD --Original Message-- From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]On Behalf
/archives//html/Amps/2005-08/msg00126.html (10,515 bytes)

34. Re: [Amps] Metric system (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Fri, 5 Aug 2005 14:38:53 -0400
I don't think there was ever any mandatory requirement that the change be affected. Probably US industry and business made a informal or maybe in some cases a formal analysis and decided it just wasn
/archives//html/Amps/2005-08/msg00189.html (9,786 bytes)

35. [Amps] 6146's (score: 1)
Author: "David C. Hallam" <DHallam@rapidsys.com>
Date: Mon, 08 Aug 2005 14:37:24 -0400
I just acquired several 6146's with strange markings. They are General Electric branded and marked 6146A in ink or paint or whatever it is. However, etched in the glass some are marked 6146B or 6146W
/archives//html/Amps/2005-08/msg00300.html (6,543 bytes)

36. Re: [Amps] 6146's (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Mon, 8 Aug 2005 18:06:21 -0400
Roy, All 6146's are not entirely interchangeable. There are some differences between the 6146/6146A and the 6146B/6146W tubes that limit their interchangeability for SOME applications, earlier Collin
/archives//html/Amps/2005-08/msg00303.html (8,313 bytes)

37. [Amps] Fwd: 6146's (score: 1)
Author: "David C. Hallam" <DHallam@rapidsys.com>
Date: Tue, 09 Aug 2005 02:00:26 -0400
I guess I should have phrased my question in more specific terms. Since these tubes are marked with two numbers, I am trying to figure out what I have. Are they really 6146A's as the branding indicat
/archives//html/Amps/2005-08/msg00317.html (8,159 bytes)

38. [Amps] 4CX600J/8809 or 4CX600JA/8921 (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Wed, 17 Aug 2005 12:35:53 -0400
Does anyone know where I can get a full data sheet with constant current curves for either of these tubes. All I can find is a brief data sheet which really doesn't give much information. David C. Ha
/archives//html/Amps/2005-08/msg00561.html (7,045 bytes)

39. [Amps] 4CX1500A or 5CX1500A (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Wed, 21 Sep 2005 13:36:18 -0400
I am building a passive grid driven HF amplifier which started out for a 4CX1500A. I have since acquired a 5CX1500A tube and socket. Since these two tubes are almost identical, is there any advantage
/archives//html/Amps/2005-09/msg00267.html (7,027 bytes)

40. [Amps] 3rd Order IMD (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Wed, 21 Sep 2005 17:45:19 -0400
Looking through Bill Orr's handbook, I found a table that gives the 3rd order IMD for 6146's in AB1 as about -24/25 db. If that's the case, how can your signal be any cleaner than that as long as the
/archives//html/Amps/2005-09/msg00273.html (6,554 bytes)

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