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61. Re: [Amps] Novel Screen Grid Regulator (score: 1): Author: "Jim Garland" <4cx250b@muohio.edu>; Date: Sat, 29 Sep 2012 11:25:19 -0600; Thanks for your comments, Paul, Carel, and Carl. I think a zener across the + input is a good suggestion, Paul. I hadn't worried about protecting the op amp because the 50:1 voltage divider would red; /archives//html/Amps/2012-09/msg00314.html (11,078 bytes)
62. [Amps] Question re GU-74B grid current (score: 1): Author: "Jim Garland" <4cx250b@muohio.edu>; Date: Sun, 21 Oct 2012 13:35:36 -0600; Could somebody advise me as to the resting plate current and operating ctrl grid bias voltage they are using on a GU-74B (plate voltage is 2500V, screen grid 300V)? Also, does the tube draw grid curr; /archives//html/Amps/2012-10/msg00108.html (6,769 bytes)
63. [Amps] Additional comments, re GU-74B/4CX800A (score: 1): Author: "Jim Garland" <4cx250b@muohio.edu>; Date: Thu, 25 Oct 2012 12:55:09 -0600; This has been an interesting thread on the GU-74B. Since I kicked off the discussion with my question about grid current ratings for the tube, I thought it might be helpful to explain my context. One; /archives//html/Amps/2012-10/msg00149.html (10,295 bytes)
64. Re: [Amps] Additional comments, re GU-74B/4CX800A (score: 1): Author: "Jim Garland" <4cx250b@muohio.edu>; Date: Fri, 26 Oct 2012 06:39:35 -0600; Thanks for your comments, Leigh. I agree with you about the benefit of single tube amps vs multiple tubes. However, I bought a dozen GU-74Bs back when they were dirt cheap, along with three sockets a; /archives//html/Amps/2012-10/msg00157.html (15,163 bytes)
65. Re: [Amps] Additional comments, re GU-74B/4CX800A (score: 1): Author: "Jim Garland" <4cx250b@muohio.edu>; Date: Fri, 26 Oct 2012 13:18:39 -0600; actuality 300V Point well taken, Carl. I am making a lot of assumptions! Obviously, there are many ways a tube can fail: faulty vacuum seal, grid contamination, overheating, inadequate filament volt; /archives//html/Amps/2012-10/msg00166.html (12,534 bytes)
66. [Amps] 8877 in Alpha 9500 (score: 1): Author: "Jim Garland" <4cx250b@muohio.edu>; Date: Mon, 19 Nov 2012 08:18:15 -0700; The Alpha 9500 uses a single 8877 with about 3600V (no load) on the plate, dropping to about 3200V under load. The low plate voltage allows Alpha to use air variable tuning caps with moderate plate s; /archives//html/Amps/2012-11/msg00129.html (7,435 bytes)
67. [Amps] Air Variable Spacing Question (score: 1): Author: "Jim Garland" <4cx250b@muohio.edu>; Date: Tue, 4 Dec 2012 10:33:47 -0700; Hi All, I'm trying to decide which air variable plate tuning cap to use on my forthcoming 160m monoband amplifier. The one I'd like to use has .080" plate spacing, and I've tested it and it works up; /archives//html/Amps/2012-12/msg00016.html (7,341 bytes)
68. Re: [Amps] Air Variable Spacing Question (score: 1): Author: "Jim Garland" <4cx250b@muohio.edu>; Date: Wed, 5 Dec 2012 23:15:04 -0700; Thanks for your note, Gerald. Your calculations are right on the mark. Sounds like my .080" cap would have enough safety margin for my application. It's a nice Cardwell capacitor, but only about 250p; /archives//html/Amps/2012-12/msg00024.html (10,487 bytes)
69. [Amps] Relay TIming Measurements (score: 1): Author: "Jim Garland" <4cx250b@muohio.edu>; Date: Thu, 13 Dec 2012 10:11:00 -0700; There aren't that many single channel scopes around these days, but one can check the relay timing with one by using the external trigger to start the sweep and the single channel to desplay the con; /archives//html/Amps/2012-12/msg00073.html (7,561 bytes)
70. Re: [Amps] Relay Timing Measurements (score: 1): Author: "Jim Garland" <4cx250b@muohio.edu>; Date: Thu, 13 Dec 2012 10:20:54 -0700; "Also, as I understand it (and I could be wrong), a dual trace scope is different from a dual channel scope, the former being quite unusual." Now that I think about it, I think I am wrong. I'm thinki; /archives//html/Amps/2012-12/msg00075.html (7,165 bytes)

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