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41. Re: [Amps] 833A GG (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Tue, 27 Jan 2015 05:23:25 -0600; Thanks, Carl. I might do that. Something like this ought to work using your method: http://www.ebay.com/itm/Capacitor-air-variable-capacitor-tuner-dual-30-Pf-capacitor-/151482230814 The neut cap that; /archives//html/Amps/2015-01/msg00316.html (10,441 bytes)
42. Re: [Amps] {Collins} Understanding Screen Current in a Tetrode (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Tue, 27 Jan 2015 17:51:03 -0600; Are you saying that we should always tune a grid-driven tetrode linear amp for the maximum screen current allowed by the manufacturer? Well, that would have been 30 or 40 mA on my homebrew AB1 grid-d; /archives//html/Amps/2015-01/msg00319.html (11,754 bytes)
43. Re: [Amps] {Collins} Understanding Screen Current in a Tetrode (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Tue, 27 Jan 2015 17:53:39 -0600; FYI, here was my post to the Collins reflector that prompted that reply. What do you think? "There is a lot of misinformation out there about screen current. But it's the most important indication of; /archives//html/Amps/2015-01/msg00320.html (12,911 bytes)
44. Re: [Amps] Topband: Elimination of Treadmill RFI on 160 meters (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Wed, 28 Jan 2015 08:25:16 -0600; Also, check out www.repeater-builder.com/astron/astron-intro-stuff.html I just read somewhere (qrz.com forums?) that the LM723 is the most common part to fail, followed by the output transistors. I p; /archives//html/Amps/2015-01/msg00339.html (7,774 bytes)
45. Re: [Amps] Astron Power Supply replies (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Thu, 29 Jan 2015 09:34:25 -0600; I fully agree. I've read many horror stories about hams who installed cheap eBay Asian RF power transistors in their rigs, severely damaging it upon power-up. 2N5686s are 12 bucks at Newark. 2N3771s; /archives//html/Amps/2015-01/msg00362.html (10,204 bytes)
46. Re: [Amps] What tube? (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Thu, 29 Jan 2015 11:55:52 -0600; That's true. See www.w0btu.com/miller-larson_effect.html 73, Mike www.w0btu.com _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailm; /archives//html/Amps/2015-01/msg00367.html (7,559 bytes)
47. Re: [Amps] Variac Question (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Mon, 2 Feb 2015 14:58:06 -0600; It sounds like a 115 volt-only Variac, so you can use it between the neutral and one 240V leg. You just connect your 240V plate transformer primary between the Variac wiper and the remaining leg of t; /archives//html/Amps/2015-02/msg00007.html (8,114 bytes)
48. Re: [Amps] Variac Question (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Mon, 2 Feb 2015 18:35:23 -0600; 10 amps is pretty marginal, yes. But he might just get away with it, provided he doesn't use a continuous-duty mode like RTTY. That 10 amp rating is for CCS, not ICAS. My HV Variac (a Staco type 1250; /archives//html/Amps/2015-02/msg00012.html (10,533 bytes)
49. Re: [Amps] Variac Question (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Mon, 2 Feb 2015 18:45:06 -0600; Exactly. I'm almost positive that my 240 volt primary transformer does not even have a center tap. 73, Mike www.w0btu.com _______________________________________________ Amps mailing list Amps@contes; /archives//html/Amps/2015-02/msg00014.html (8,283 bytes)
50. Re: [Amps] D.C. on filaments of GS-35B? (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Wed, 4 Feb 2015 06:33:51 -0600; How critical is the filament voltage on The GS-35B and GI7-BT? What is the absolute min and max voltage values, whether AC or DC? Since the filaments on those tubes are indirectly heated, it's probab; /archives//html/Amps/2015-02/msg00051.html (7,697 bytes)
51. [Amps] Arctic Silver with and without silver (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Thu, 5 Feb 2015 07:58:42 -0600; I just ordered Arctic Silver thermal grease from Newark. What I actually received was labeled "Arctic Alumina", "Premium Ceramic Polysynthetic Thermal Compound, By Arctic Silver". It's white, and not; /archives//html/Amps/2015-02/msg00062.html (8,432 bytes)
52. Re: [Amps] Arctic Silver with and without silver (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Thu, 5 Feb 2015 08:38:57 -0600; It's true that some ceramics (like beryllium oxide) are highly conductive. But not as conductive as silver. However, I think I may have found the answer by looking at the MSDS for both products on ar; /archives//html/Amps/2015-02/msg00064.html (8,792 bytes)
53. Re: [Amps] I'm not kidding: TL922 (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Fri, 6 Feb 2015 13:14:43 -0600; Somebody suggested having a young person listen for a very-high pitched sound. I think that's a very good idea indeed. Has that been tried yet? I know a teenage boy that can hear the 'ultrasonic' noi; /archives//html/Amps/2015-02/msg00078.html (8,887 bytes)
54. [Amps] No grid current meter on FL-2100B? (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Mon, 23 Feb 2015 08:09:31 -0600; I'm trying to help a friend (in another state) convert his Yaesu FL-2100B from 572Bs to GI7-BTs. I just noticed that there is no grid current meter! Is there an easy way to convert the SWR meter to m; /archives//html/Amps/2015-02/msg00123.html (6,760 bytes)
55. Re: [Amps] No grid current meter on FL-2100B? (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Tue, 24 Feb 2015 07:45:10 -0600; Hi Jim, I appreciate your thoughts, and I just finished sharing them with the ham on 40m. He concurred with you about the SWR meter! I just e-mailed him W8JI's web page on metering amplifiers (he onl; /archives//html/Amps/2015-02/msg00130.html (9,521 bytes)
56. Re: [Amps] GS35B Gassy, or Arcing? (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Wed, 25 Feb 2015 15:18:41 -0600; Does it do this with a cold filament? Regardless, have you gettered it by running the filament by itself for a length of time? That's a must for those tubes before using them. Type these (and variati; /archives//html/Amps/2015-02/msg00141.html (9,168 bytes)
57. Re: [Amps] GS35B Gassy, or Arcing? (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Wed, 25 Feb 2015 15:32:03 -0600; The getter on the GS-35B (and GI7-B, etc.) is on the cathode. IIRC, the filament should be run for several days with no other voltages applied. One site says to bring up the filament voltage graduall; /archives//html/Amps/2015-02/msg00143.html (8,143 bytes)
58. Re: [Amps] GS35B Gassy, or Arcing? (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Wed, 25 Feb 2015 15:43:51 -0600; Here you go, from http://gs35b.com/discussion.html :-) - *Filament Burn In - What is burn in and Gettering? Why do we have to do it? * Burning in or conditioning a tube is the process of applying fil; /archives//html/Amps/2015-02/msg00144.html (8,956 bytes)
59. Re: [Amps] GS35B Gassy, or Arcing? (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Wed, 25 Feb 2015 17:22:28 -0600; So you did this test with a cold filament, but AFTER you gettered it? Okay. I don't really feel qualified to offer you any further advice in this situation; but re-reading your post, my gut feeling i; /archives//html/Amps/2015-02/msg00151.html (9,310 bytes)
60. Re: [Amps] GS35B Gassy, or Arcing? (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Thu, 26 Feb 2015 14:04:45 -0600; Sounds like you received some other info off the list. I have a wild hunch. What happens if you don't leave the grid floating? Try the hi-pot test with the grid connected to the cathode. And did you; /archives//html/Amps/2015-02/msg00155.html (9,394 bytes)

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