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61. [Amps] Bias Zener Diodes In Parallel ? (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Wed, 17 Jul 2002 07:26:27 +0100; To: <amps@contesting.com> You took the words out of my mouth, Marv. For a tested design using TL431, you can see a circuit on G3SEK's website. Steve; /archives//html/Amps/2002-07/msg00238.html (10,307 bytes)
62. [Amps] Design around an 8938 for 432MHz, circa 1980? (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Sun, 21 Jul 2002 15:36:24 +0000; I have a copy of an article by Tony Souza, W3HMU, that matches your description. It comes from Ham Radio, June 1977. I can send you a copy (contact me directly) or I can scan it and put it on a web p; /archives//html/Amps/2002-07/msg00376.html (7,589 bytes)
63. [Amps] Muffin Fan on Swan Mark 1 (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Sat, 27 Jul 2002 07:30:30 +0100; 0.95 is a pretty accurate value for a dab of Tippex (don't know the US brand of correction fluid). Steve; /archives//html/Amps/2002-07/msg00499.html (8,739 bytes)
64. [Amps] 4CX800/GU74B Socket (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Fri, 14 Jun 2002 10:27:13 +0000; The key point is whether the screen has a low impedance to ground at frequencies where the circuit can deliver much gain. In the usual '250 bases and in the Svetlana SK-1 base, the screen cap is sand; /archives//html/Amps/2002-06/msg00088.html (8,664 bytes)
65. [Amps] CTI follow up (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Tue, 25 Jun 2002 11:06:15 +0000; Out of interest, does anyone have figures for the dynamic regulation of gas tubes? I reckon a string of zeners will run at about 100 ohms so that would give 1-2V ripple on a '250 screen, depending o; /archives//html/Amps/2002-06/msg00206.html (7,843 bytes)
66. [Amps] CTI follow up (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Tue, 25 Jun 2002 18:34:39 +0100; Thanks, Marv - so there might not be much to choose apart from the pretty glow (unless the regulator tubes oscillate, been there, done that). Steve; /archives//html/Amps/2002-06/msg00216.html (8,265 bytes)
67. [Amps] CTI follow up (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Tue, 25 Jun 2002 20:58:19 +0100; --Original Message-- From: w2fca@cs.com <w2fca@cs.com> To: "Steve Thompson" <g8gsq@qsl.net>; amps@contesting.com <amps@contesting.com> To: <amps@contesting.com> Date: 25 June 2002 19:38 Subject: Re:; /archives//html/Amps/2002-06/msg00218.html (8,399 bytes)
68. [Amps] CTI follow up - miscellaneous ramblings (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Wed, 26 Jun 2002 07:05:53 +0100; --Original Message-- From: COLIN LAMB <k7fm@teleport.com> To: amps@contesting.com <amps@contesting.com>; Steve Thompson <g8gsq@qsl.net> To: <amps@contesting.com> Date: 25 June 2002 22:05 Subject: Re:; /archives//html/Amps/2002-06/msg00225.html (8,627 bytes)
69. [Amps] CTI follow up - miscellaneous ramblings (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Wed, 26 Jun 2002 17:10:56 +0000; OK, so we need several chains in parallel to carry enough current to swamp the tube screen variations. Think of the saving on the shack lighting bill :-) Steve; /archives//html/Amps/2002-06/msg00232.html (9,705 bytes)
70. [Amps] OT - anyone using a TS930 (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Thu, 27 Jun 2002 23:06:30 +0100; I'd like to hear from anyone - there's a detail I'd like to check for a repair. Thanks Steve; /archives//html/Amps/2002-06/msg00248.html (6,205 bytes)
71. [Amps] Rectifier diode strings (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Tue, 7 May 2002 07:49:49 +0100; --Original Message-- From: Tom Rauch <w8ji@contesting.com> To: Ian White, G3SEK <G3SEK@ifwtech.co.uk>; amps@contesting.com <amps@contesting.com> To: <amps@contesting.com> Date: 06 May 2002 19:28 Subj; /archives//html/Amps/2002-05/msg00061.html (8,522 bytes)
72. [Amps] Transformer secondary resistance (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Tue, 7 May 2002 09:42:14 +0000; It's worth searching out the Duncan Amps web site and downloading their PSU designer software. It's very informative to get an idea of the peak and rms currents in any situation - rms especially wher; /archives//html/Amps/2002-05/msg00062.html (8,584 bytes)
73. [Amps] Transformer secondary resistance (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Tue, 7 May 2002 12:46:27 +0000; That side of it was part of the piece, but I think the writer was also concerned about the possibility of 'backwards' current in the lower voltage winding - I can imagine it being minor where winding; /archives//html/Amps/2002-05/msg00068.html (8,618 bytes)
74. [Amps] Cool Amp Web Site (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Fri, 10 May 2002 10:40:04 +0000; Looking at the material safety sheet it looks very similar to products sold by clock restoration suppliers for silvering dials, in case anyone can't get hold of the original. I'm always surprised how; /archives//html/Amps/2002-05/msg00114.html (7,407 bytes)
75. [Amps] Re: PUT your price on your forsale WAS FS:cheap tubesGU74B,GI7B,GS9B,GS23B (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Mon, 13 May 2002 07:43:19 +0100; --Original Message-- From: yo9fzs <yo9fzs@office.deck.ro> To: amps@contesting.com <amps@contesting.com> To: <amps@contesting.com> Date: 13 May 2002 07:11 Subject: Re: [Amps] Re: PUT your price on you; /archives//html/Amps/2002-05/msg00154.html (11,804 bytes)
76. [Amps] MLA2500 choke (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Mon, 13 May 2002 14:30:40 +0000; Does anyone have winding details for the anode choke in a MLA2500? Thanks, Steve; /archives//html/Amps/2002-05/msg00168.html (8,011 bytes)
77. [Amps] al-1500 parasitic?? or some other problem? (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Tue, 14 May 2002 12:13:35 +0000; Frequency division (producing products on 1/2f ans 3/2f etc) is not unusual in solid state PAs, especially using bipolars. It's often self sustaining once started rather than fleeting or transient. I; /archives//html/Amps/2002-05/msg00193.html (9,936 bytes)
78. [Amps] al-1500 parasitic?? or some other problem? (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Wed, 15 May 2002 07:21:47 +0100; --Original Message-- From: jeff millar <wa1hco@adelphia.net> To: David Robbins <k1ttt@arrl.net> Cc: 'Amps' <amps@contesting.com> To: <amps@contesting.com> Date: 15 May 2002 07:15 Subject: Re: [Amps]; /archives//html/Amps/2002-05/msg00214.html (10,612 bytes)
79. [Amps] Nonsense (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Thu, 16 May 2002 15:04:26 +0000; Perhaps 'sub harmonic' is a poor choice of term, but it's been in use as long as I've been in the rf business to describe division products. In RF Design some years ago there was a detailed article a; /archives//html/Amps/2002-05/msg00239.html (7,216 bytes)
80. [Amps] Nonsense (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Thu, 16 May 2002 19:49:03 +0000; In linear circuits, I expect it's not possible, but few circuits are without non-linear aspects that become significant under some conditions. As best I remember the article I read, the argument goes; /archives//html/Amps/2002-05/msg00247.html (8,519 bytes)

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