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61. Re: [Amps] Amp for sale on eBay (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Thu, 2 Feb 2006 19:20:23 -0500
I guess that since Malcolm Bricklin was connected with the importing of the Yugo, he would be expected to import the Cherry. One of the funniest sights I ever saw was a rusty Yugo parked with a crook
/archives//html/Amps/2006-02/msg00037.html (12,183 bytes)

62. [Amps] PL-175 (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Wed, 8 Feb 2006 10:46:45 -0500
Does anyone know where I might be able to get a pair of PL-175A's? I know they have been out of production for years. If they are available, I am somewhat sensitive to price. I have 4-400A's that are
/archives//html/Amps/2006-02/msg00189.html (6,670 bytes)

63. Re: [Amps] boonton 59 (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Sun, 19 Feb 2006 11:58:43 -0500
Go to the BAMA web site and you can download a manual. I think you will find the tubes are readily available at any of the dealers who sell parts to restore antique radios or from internet tube vendo
/archives//html/Amps/2006-02/msg00348.html (7,796 bytes)

64. Re: [Amps] 813 HB (score: 1)
Author: "David C.Hallam" <dhallam@rapidsys.com>
Date: Sun, 5 Mar 2006 18:00:05 -0500
There also is an interesting article in the November 1961 QST about building a rack of single band GG amplifiers using 2 - 813s, easy band change. David KC2JD ________________________________________
/archives//html/Amps/2006-03/msg00100.html (6,690 bytes)

65. [Amps] Oscilloscopes (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Fri, 10 Mar 2006 13:58:42 -0500
What is the difference between a TEK 454 and a 454A? David KC2JD _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amp
/archives//html/Amps/2006-03/msg00248.html (6,853 bytes)

66. Re: [Amps] Oscilloscopes (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Sat, 11 Mar 2006 15:56:54 -0500
Thanks to all who responded to my question about the TEK 454 and 454A oscilloscopes. David KC2JD _______________________________________________ Amps mailing list Amps@contesting.com http://lists.con
/archives//html/Amps/2006-03/msg00270.html (7,278 bytes)

67. Re: [Amps] Threads - was idiocy - perhaps it still is (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Wed, 15 Mar 2006 10:30:23 -0500
There are small breweries in the US making beer as good as anyone in the world except for maybe the Belgians. Even AB is starting to catch on. Too bad you can't say the same for Millers and Coors. Da
/archives//html/Amps/2006-03/msg00388.html (10,336 bytes)

68. Re: [Amps] tube impedance, figuring tank circuit values (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Sat, 1 Apr 2006 12:47:02 -0500
I think that Peter inadvertently left out a factor of 2. According to my RCA tube manual Rp is equal to twice the plate voltage swing divided by the max current. David KC2JD --Original Message-- From
/archives//html/Amps/2006-04/msg00002.html (9,687 bytes)

69. Re: [Amps] Plate impedance (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Mon, 10 Apr 2006 15:47:30 -0400
The formula given in RCA Transmitting Tube Manual TT-5 is Rp = 2(Eb - Ebmin)/Ibmax Where Eb = Plate (or anode) voltage at value chosen for operation Ebmin = Plate voltage at minimum of swing; for a t
/archives//html/Amps/2006-04/msg00147.html (10,281 bytes)

70. Re: [Amps] Plate Impedance (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Mon, 10 Apr 2006 20:09:00 -0400
Will, That is a typo. Read the section thoroughly and you will see that you are to use Ibmax in the formula. David KC2JD Gerald, Effective RF load resistance; 2 x (Eb - Ebmin) / Ibo Ibo = Zero signal
/archives//html/Amps/2006-04/msg00154.html (20,439 bytes)

71. [Amps] Help with HP 428B Clip On Ammeter (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Wed, 3 May 2006 08:47:16 -0400
I recently acquired a nonworking HP-428B. The price was right, free. I downloaded a 428B manual from BAMA but find that HP introduced modifications that are not covered in the earlier BAMA manual ver
/archives//html/Amps/2006-05/msg00007.html (7,180 bytes)

72. [Amps] For Sale Filament Transformers (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Tue, 9 May 2006 14:17:17 -0400
I have 2 NOS Collins 5VCT 14.5A 220/240V secondary filament transformers for sale. $25 each including shipping CONUS. Please reply off line. David KC2JD ______________________________________________
/archives//html/Amps/2006-05/msg00055.html (6,552 bytes)

73. [Amps] VTVM Diodes (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Mon, 15 May 2006 16:36:34 -0400
I am trying to find an AC probe for my HP-410C. I have a probe from a USM 116 VTVM. The 410C uses an EA53 diode in the probe and the 116 uses an EA52. From what I have found on the internet, these tw
/archives//html/Amps/2006-05/msg00102.html (7,002 bytes)

74. Re: [Amps] VTVM Diodes (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Tue, 16 May 2006 13:08:57 -0400
Will, I am not too worried about the calibration. I am not doing anything that requires traceability to any standard. It is just for my own use. I can calibrate the meter myself close enough for my u
/archives//html/Amps/2006-05/msg00117.html (10,361 bytes)

75. Re: [Amps] VTVM Diodes (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Tue, 16 May 2006 13:51:54 -0400
Will, These tubes are the one used in the tip of the AC probe. HP used the EA53 or 2-01C diode in the probe for the 410B. They had different filament voltages and the meter had an adjustment to chang
/archives//html/Amps/2006-05/msg00119.html (12,242 bytes)

76. [Amps] g8wrb Site (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Tue, 30 May 2006 12:33:34 -0400
I have been trying to access the g8wrb web site to look for a tube data sheet. Is access to this site restricted? David KC2JD _______________________________________________ Amps mailing list Amps@co
/archives//html/Amps/2006-05/msg00510.html (6,721 bytes)

77. Re: [Amps] emtron dx-1??? for a couple hundred bucks? (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Mon, 5 Jun 2006 14:20:01 -0400
I don't know but that it shows the eBay system does work. The feedback system has warned that the seller might not legit and to stay away. Other than that, ham fests, at least in the West Central Flo
/archives//html/Amps/2006-06/msg00133.html (8,957 bytes)

78. Re: [Amps] emtron dx-1??? (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Mon, 5 Jun 2006 16:00:19 -0400
I used to go to Deerfield in the early 80's too and got some good treasures. I lived in Connecticut at the time. Even when I lived in New Jersey in the early 90's, I got good things at hamfests. But
/archives//html/Amps/2006-06/msg00140.html (10,503 bytes)

79. [Amps] 6146 Tubes (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Wed, 7 Jun 2006 12:50:59 -0400
Is there any way to tell by visual examination the difference between a 6146A and a 6146B? I have a General Electric tube that is marked 6146A. However, etched in the glass bulb is 6146B. I would lik
/archives//html/Amps/2006-06/msg00205.html (6,450 bytes)

80. Re: [Amps] Serious transformer problem (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Sat, 1 Jul 2006 09:38:52 -0400
In the light of the thread that seems to be developing here, I have a question. I have a terrible noise problem at my QTH, Clearwater, FL. The noise runs S6-S9 almost all of the time. A quiet day on
/archives//html/Amps/2006-07/msg00013.html (7,995 bytes)

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