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References: [ +from:4cx250b@miamioh.edu: 327 ]

Total 327 documents matching your query.

61. Re: [Amps] Building an Amp 101 (score: 1)
Author: "Jim Garland" <4cx250b@miamioh.edu>
Date: Fri, 17 Jan 2014 18:40:35 -0700
Jerry, Let me join the chorus of well-wishers in the group encouraging you to take the plunge! It's very satisfying to build your own QRO amplifier, and I think you'd find it to be enormously educati
/archives//html/Amps/2014-01/msg00120.html (12,576 bytes)

62. Re: [Amps] Building an Amp 101 (score: 1)
Author: "Jim Garland" <4cx250b@miamioh.edu>
Date: Sat, 18 Jan 2014 08:41:10 -0700
Re Model 86 vs. Model 88 bandswitches: I used a model 86 on my homebrew 8877 amp (4700V on the plate), but after flashing it over, I upgraded to a model 88. With a six position bandswitch, the model
/archives//html/Amps/2014-01/msg00124.html (10,856 bytes)

63. Re: [Amps] Building an Amp 101 (score: 1)
Author: "Jim Garland" <4cx250b@miamioh.edu>
Date: Sat, 18 Jan 2014 10:52:31 -0700
Hi Colin, I agree that one shouldn't leave the unused segments of of a tank coil completely floating, and I don't do that. As you suggest, I connect the wiper on the bandswitch to the cold (antenna)
/archives//html/Amps/2014-01/msg00135.html (12,612 bytes)

64. Re: [Amps] Building an Amp 101 (score: 1)
Author: MU 4CX250B <4cx250b@miamioh.edu>
Date: Sun, 19 Jan 2014 07:32:06 -0700
Relays are certainly a possibility, Al, but for a nine band amplifier things get a bit complicated. My latest project ( 90% completed) is a duo band 80m/160m amplifier with a pi L tank circuit, and f
/archives//html/Amps/2014-01/msg00154.html (10,242 bytes)

65. Re: [Amps] Another eBay Goodie (score: 1)
Author: "Jim Garland" <4cx250b@miamioh.edu>
Date: Thu, 23 Jan 2014 09:46:58 -0700
I agree that the metalwork looks nicely done, and the amplifier may work (though I'm dubious about the lower frequency bands), but IMHO its esthetics are just butt-ugly. Jim W8ZR Cater no 01/22/14 __
/archives//html/Amps/2014-01/msg00227.html (10,873 bytes)

66. Re: [Amps] Weird tubes in an amplifier (score: 1)
Author: MU 4CX250B <4cx250b@miamioh.edu>
Date: Tue, 28 Jan 2014 22:00:02 -0700
When I was a kid I built a linear amp running four 6AG7s, from an article in CQ. The author had discovered that the nominal 3W plate dissipation of the 6AG7 could be pushed to 100W. The tubes got so
/archives//html/Amps/2014-01/msg00287.html (8,602 bytes)

67. Re: [Amps] Weird tubes in an amplifier (score: 1)
Author: MU 4CX250B <4cx250b@miamioh.edu>
Date: Wed, 29 Jan 2014 16:42:29 -0700
Sent from my iPhone _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2014-01/msg00307.html (13,950 bytes)

68. [Amps] Vacuum relay needed (score: 1)
Author: "Jim Garland" <4cx250b@miamioh.edu>
Date: Sun, 2 Feb 2014 16:56:49 -0700
I'm an idiot. The very last step in my two-year amplifier project was to connect four silver-plated straps to a Kilovac H-16/S7 vacuum relay. Installing one of the straps, my screwdriver slipped and
/archives//html/Amps/2014-02/msg00018.html (6,785 bytes)

69. Re: [Amps] Vacuum relay needed (score: 1)
Author: "Jim Garland" <4cx250b@miamioh.edu>
Date: Mon, 3 Feb 2014 08:13:00 -0700
Thanks for the suggestion, Mike. The Gigavac G12SP would do the trick (the price is reasonable for a DPDT relay- $132) but the specs are contradictory. On the data page the relay is touted as "2.5KW
/archives//html/Amps/2014-02/msg00025.html (10,047 bytes)

70. Re: [Amps] Air temps leaving the amp. (score: 1)
Author: "Jim Garland" <4cx250b@miamioh.edu>
Date: Mon, 3 Feb 2014 08:24:17 -0700
This raises an interesting issue. How does one reduce the impeller speed on a blower with a 120 VAC motor (capacitor start)? I've done some tests on several blowers (3370 rpm) and find the rpm doesn'
/archives//html/Amps/2014-02/msg00026.html (8,551 bytes)

71. Re: [Amps] Air temps leaving the amp. (score: 1)
Author: MU 4CX250B <4cx250b@miamioh.edu>
Date: Mon, 3 Feb 2014 11:20:13 -0700
Yes, that will work of course, but it doesn't make the blower quieter, at least not appreciably. 73, Jim w8zr Sent from my iPhone _______________________________________________ Amps mailing list Amp
/archives//html/Amps/2014-02/msg00033.html (8,245 bytes)

72. Re: [Amps] Solid State Relays Again (score: 1)
Author: "Jim Garland" <4cx250b@miamioh.edu>
Date: Sun, 9 Feb 2014 21:44:17 -0700
Hi Jim, I'm guessing the relay shorted because of a voltage transient, not a current overload. A possible culprit would be the inductive kick from the plate transformer caused when the relay opened.
/archives//html/Amps/2014-02/msg00067.html (8,551 bytes)

73. Re: [Amps] Solid state relays..again (score: 1)
Author: MU 4CX250B <4cx250b@miamioh.edu>
Date: Thu, 13 Feb 2014 18:49:40 -0700
I agree completely with Manfred's assessment, but just want to add a couple of comments. First, these NTC resistors are usually referred to as "current inrush limiters," and cost about a dollar. Seco
/archives//html/Amps/2014-02/msg00116.html (11,355 bytes)

74. [Amps] HB amp shakedown cruise (score: 1)
Author: "Jim Garland" <4cx250b@miamioh.edu>
Date: Thu, 20 Feb 2014 10:24:47 -0700
For the past two years, I've been woking on a duo-band 80m/160m amplifier using three GU74Bs. I've debugged and bench-tested the control grid and screen grid regulators, QSK circuitry, plate and grid
/archives//html/Amps/2014-02/msg00185.html (9,567 bytes)

75. [Amps] HV Fuses (score: 1)
Author: "Jim Garland" <4cx250b@miamioh.edu>
Date: Sat, 22 Feb 2014 15:15:49 -0700
Here's a user report on Chinese-made HV fuses, widely available on eBay (search on "900 mA HV fuses" ) These fuses, intended for microwave ovens, come in several current ratings (900 mA is the larges
/archives//html/Amps/2014-02/msg00221.html (9,054 bytes)

76. [Amps] Simpson Panel Mtr Wanted (score: 1)
Author: "Jim Garland" <4cx250b@miamioh.edu>
Date: Tue, 25 Feb 2014 16:10:33 -0700
I'm looking for a replacement analog panel meter, full scale 25 or 50 microamps DC, either tautband or iron vane type. Specifically, I need a Simpson model 2122, which is the "Century Series" 2.5in m
/archives//html/Amps/2014-02/msg00258.html (6,833 bytes)

77. Re: [Amps] Cool Amp Silver Plating (score: 1)
Author: MU 4CX250B <4cx250b@miamioh.edu>
Date: Fri, 28 Feb 2014 08:48:29 -0700
I've used Cool-Amp powder for many years. It works fine, is easy to use. Seems non-toxic, although I always wear gloves. No ventilation needed. I think the coating is thinner electroplated silver. 73
/archives//html/Amps/2014-02/msg00271.html (8,249 bytes)

78. Re: [Amps] Cool Amp Silver Plating (score: 1)
Author: "Jim Garland" <4cx250b@miamioh.edu>
Date: Sat, 1 Mar 2014 11:40:47 -0700
To inhibit tarnishing, I spray satin or glossy clear Krylon spray on my silver-plated coils and strap. Of course I mask off parts that will be clamped or soldered to, although Krylon actually doesn't
/archives//html/Amps/2014-03/msg00007.html (7,202 bytes)

79. [Amps] Worst Tube Socket Ever (score: 1)
Author: "Jim Garland" <4cx250b@miamioh.edu>
Date: Sun, 9 Mar 2014 12:43:14 -0600
Does anyone have any tips for plugging a GU74B into the mating SK1A socket.? The sosckets iin my amp are recessed below the chassis about about 1 inch, and I always have a devil of a time plugging in
/archives//html/Amps/2014-03/msg00032.html (7,463 bytes)

80. [Amps] Pi-L Network Question (score: 1)
Author: "Jim Garland" <4cx250b@miamioh.edu>
Date: Tue, 11 Mar 2014 09:44:32 -0600
Hi all, I've built a tank circuit using the on-line Pi-L network calculators by VE3OZZ and also G3SEK. These are both based on the equations published in an article in August 1983 QST (by W5FD). Alth
/archives//html/Amps/2014-03/msg00034.html (8,786 bytes)

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