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121. Re: [Amps] Screen Power Supply. (score: 1): Author: gdaught6@stanford.edu; Date: Sun, 29 Jun 2008 19:09:05 -0700; W6TR wrote... That darned transistor has generated more correspondence for me than any other phase of the project! That being so, I'll post to the whole reflector. Keeping in the mind the fact that t; /archives//html/Amps/2008-06/msg00236.html (9,273 bytes)
122. [Amps] 3-500Z's available (score: 1): Author: gdaught6@stanford.edu; Date: Wed, 30 Jul 2008 15:02:41 -0700; Hi All, I got a telephone call from N3EGQ, the widow of WA3FIB, stating that she had a matched pair of 3-500Z's available. WA3FIB had told her they were fragile, and should be kept in a safe place, s; /archives//html/Amps/2008-07/msg00360.html (6,778 bytes)
123. [Amps] ham gear for sale (score: 1): Author: gdaught6@stanford.edu; Date: Sun, 14 Sep 2008 20:46:11 -0700; Hi All, The following gear is available from the widow of an SK: It might be a great package deal for a new ham! Heathkit Linear amplifier, SB-200 Spare 572-B tubes (2) Vibroplex paddle Yaesu FT-990; /archives//html/Amps/2008-09/msg00134.html (7,047 bytes)
124. Re: [Amps] RF Interference (score: 1): Author: gdaught6@stanford.edu; Date: Sat, 11 Oct 2008 09:26:17 -0700; < snip, snip > I don't know if this will help your problem but here is my experience. My neighbor's garage door would open and close when I was on 10m CW. Ferrites didn't help, but we put a disc cera; /archives//html/Amps/2008-10/msg00052.html (8,233 bytes)
125. Re: [Amps] Semtech diode (score: 1): Author: gdaught6@stanford.edu; Date: Mon, 27 Oct 2008 21:07:12 -0700; A single device when cut from the processed wafer is a "die". A bunch of them are "dice". That's 1960 terminology from Fairchild, so that ought to be pretty solid. Now everything is "chips". 73, Geo; /archives//html/Amps/2008-10/msg00130.html (7,991 bytes)
126. Re: [Amps] pole transformer (score: 1): Author: gdaught6@stanford.edu; Date: Mon, 02 Feb 2009 08:57:37 -0800; Greetings, Many have contributed to the PCB thread. etc. Let me add my tuppence worth. 1. PCB's are dangerous to living things. 2. There are transformers, capacitors, and the like that are perfectly; /archives//html/Amps/2009-02/msg00029.html (9,175 bytes)
127. Re: [Amps] RF ? (score: 1): Author: gdaught6@stanford.edu; Date: Wed, 04 Feb 2009 09:14:11 -0800; My neighbor's garage door would be triggered to open or close when I was sending CW. After a bit of fiddling, we found that a 0.01uF disc capacitor across the connection to the remote (manual) switc; /archives//html/Amps/2009-02/msg00075.html (8,342 bytes)
128. Re: [Amps] SB-220 and load mismatching... (score: 1): Author: gdaught6@stanford.edu; Date: Mon, 02 Mar 2009 17:04:12 -0800; Carl wrote... Amen to that! Consider an 80M dipole, high in the air, fed with ladder line. The SWR might be VERY high, but It will work very well on most any band! Now consider a dummy load. Its SWR; /archives//html/Amps/2009-03/msg00075.html (8,028 bytes)
129. [Amps] lk-550 manual sought (score: 1): Author: gdaught6@stanford.edu; Date: Tue, 21 Jul 2009 11:21:28 -0700; Does anyone have a .pdf file of the LK-550 manual that they would be willing to send me? I find it listed at BAMA but for some reason I can't download it. Thanks in advance, and vy 73, George T Daugh; /archives//html/Amps/2009-07/msg00241.html (6,852 bytes)
130. Re: [Amps] lk-550 manual sought (score: 1): Author: gdaught6@stanford.edu; Date: Wed, 22 Jul 2009 08:10:24 -0700; Colleagues, I want to offer my thanks to all who responded to my plea for the lk-550 manual. I have received it from fellows who had scanned their own versions, and those who downloaded it from BAMA; /archives//html/Amps/2009-07/msg00276.html (7,221 bytes)
131. [Amps] lk-550 woes (score: 1): Author: gdaught6@stanford.edu; Date: Tue, 15 Sep 2009 14:03:00 -0700; Hi group, I've got a friend's Amp supply LK-550 with the optional PAC-5 power supply. The amp is back for the umpteenth time with melted plates on the tune capacitor. In previous visits, I've filed,; /archives//html/Amps/2009-09/msg00210.html (7,715 bytes)
132. Re: [Amps] Titan II Pedestal (score: 1): Author: gdaught6@stanford.edu; Date: Tue, 01 Dec 2009 16:37:49 -0800; Bob wrote... pedestal on the floor. I will vent and filter the air. The amp will sit on about a 30 degree angle. I would appreciate your comments as to whether sitting at this angle will create a pro; /archives//html/Amps/2009-12/msg00019.html (6,951 bytes)
133. Re: [Amps] Alternative cooling strategies for SB-220? (score: 1): Author: gdaught6@stanford.edu; Date: Sat, 19 Dec 2009 21:27:28 -0800; Mike wrote... Not water cooled! Vapor cooled. It evaporates water to get rid of the heat. That's much more effective than water cooling. 73, George T Daughters, K6GT CU in the California QSO Party (C; /archives//html/Amps/2009-12/msg00506.html (10,127 bytes)
134. Re: [Amps] HB amps - what you can build with no tools (score: 1): Author: gdaught6@stanford.edu; Date: Tue, 02 Feb 2010 09:06:10 -0800; Jeff wrote... That's not too stressful for me. I apply the test "Are the burrs doing to make me bleed?" If so, I work on tidying up the edge. If not, and the hole is going to be covered by the meter; /archives//html/Amps/2010-02/msg00086.html (9,296 bytes)
135. Re: [Amps] Resistor Before the Capacitor? (long) (score: 1): Author: gdaught6@stanford.edu; Date: Mon, 08 Feb 2010 10:38:50 -0800; Several people have contributed to this topic. I'm not sure they have all understood the function of a "glitch" resistor, at least MY idea of the function of a glitch resistor. Putting the resistor "; /archives//html/Amps/2010-02/msg00248.html (7,996 bytes)
136. [Amps] 4cx800a (score: 1): Author: gdaught6@stanford.edu; Date: Mon, 15 Feb 2010 15:44:41 -0800; Let me throw my experience(s) into this. Not God's word, just my own personal experience. Svetlana made the GU-74B (I don't want to fuss with Cyrillic letters here) which was used in some commerciall; /archives//html/Amps/2010-02/msg00419.html (7,090 bytes)
137. Re: [Amps] Matching GU-74Bs (score: 1): Author: gdaught6@stanford.edu; Date: Tue, 23 Mar 2010 08:29:53 -0700; Carl wrote... < snip > I have a bit of experience with the Russian tubes. I was surprised by how different the bias requirements for the tubes can be. I have measured variations in grid bias voltage; /archives//html/Amps/2010-03/msg00491.html (8,369 bytes)
138. [Amps] 30-L1 available (score: 1): Author: gdaught6@stanford.edu; Date: Wed, 24 Mar 2010 10:15:51 -0700; Collins fans (or anyone else) Some time ago I was given a 30-L1 which had started to eat fuses. It is cosmetically about a 9. The tubes are Mullards. I don't know what is wrong with it, and I have to; /archives//html/Amps/2010-03/msg00560.html (6,582 bytes)
139. Re: [Amps] 5CX1500A (score: 1): Author: gdaught6@stanford.edu; Date: Thu, 06 May 2010 13:54:40 -0700; Peter wrote... This, and many other tube data sheets can be found at: http://www.g8wrb.org/pentodes/ 73, George T Daughters, K6GT CU in the California QSO Party (CQP) October 2-3, 2010 ______________; /archives//html/Amps/2010-05/msg00081.html (7,923 bytes)
140. Re: [Amps] Rebuilt tubes (score: 1): Author: gdaught6@stanford.edu; Date: Tue, 06 Jul 2010 14:58:05 -0700; On my last visit to ECONCO [last year] they said that they do NOT rebuild oxide cathode tubes. They have also stopped rebuilding the 5cx1500b and 3cx1200Z7, two tubes of ham interest. [I guess there; /archives//html/Amps/2010-07/msg00065.html (7,816 bytes)

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