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161. Re: [Amps] Grid Bias Supply followup (score: 1): Author: TexasRF@aol.com; Date: Sat, 22 Mar 2008 11:00:55 EDT; Exactly! I might mention that if you plan to operate SSB, and have grid current, there will be a voltage drop across the 250 ohm rheostat that adds to the bias supply voltage. While not a really big; /archives//html/Amps/2008-03/msg00207.html (10,024 bytes)
162. Re: [Amps] Relays (score: 1): Author: TexasRF@aol.com; Date: Sun, 30 Mar 2008 08:37:30 EDT; When I first saw a Jennings RJ-1, and compared it to the open frame relay my '220 was using, it was astonishing. That was because vacuum relays are good for isolation. However RJ-1's are virtually us; /archives//html/Amps/2008-03/msg00354.html (7,636 bytes)
163. Re: [Amps] Gonset 903 2 meter amplifier question (score: 1): Author: TexasRF@aol.com; Date: Sun, 30 Mar 2008 22:47:29 EDT; Larry, your descriptions sounds like a classic example of self oscillation. The usual fix for that is adjustment of the grid/plate neutralization circuit. There is plenty of info about this in any AR; /archives//html/Amps/2008-03/msg00377.html (9,682 bytes)
164. Re: [Amps] Relays (score: 1): Author: TexasRF@aol.com; Date: Wed, 2 Apr 2008 14:59:11 EDT; I always wondered how to achieve that "Thuuuuung" sound at key down. 73/k5gw In a message dated 4/2/2008 12:39:57 P.M. Central Standard Time, km1h@jeremy.mv.com writes: With a real amp the blower noi; /archives//html/Amps/2008-04/msg00043.html (10,318 bytes)
165. Re: [Amps] HV transformer issue (score: 1): Author: TexasRF@aol.com; Date: Sat, 3 May 2008 20:24:44 EDT; Are these through bolts supposed to be insulated? 73/gw In a message dated 5/3/2008 7:20:02 P.M. Central Daylight Time, n3db@radix.net writes: Hello all, I am seeking input on a potential problem wit; /archives//html/Amps/2008-05/msg00017.html (10,197 bytes)
166. Re: [Amps] HV transformer issue (score: 1): Author: TexasRF@aol.com; Date: Sat, 3 May 2008 21:26:24 EDT; I could be wrong about this but my recollection is that not only should the through bolts be insulated, but also the hardware at both ends as well. The idea is to prevent an accidental shorted turn t; /archives//html/Amps/2008-05/msg00020.html (13,238 bytes)
167. Re: [Amps] liquid cooled Amplifier coolant recommendations (score: 1): Author: TexasRF@aol.com; Date: Fri, 16 May 2008 10:52:53 EDT; Fletch, I have been using the same cavity amplifier for several years. Walmart has distilled water for about $.75 per gallon that works just fine. As the water ages, the screen current tends to creep; /archives//html/Amps/2008-05/msg00108.html (9,202 bytes)
168. Re: [Amps] liquid cooled Amplifier coolant recommendations (score: 1): Author: TexasRF@aol.com; Date: Fri, 16 May 2008 15:31:29 EDT; But, but, but, In a design with a grounded screen, there will be screen current showing due to the dc current generated from plate voltage flowing through the water to ground. With say, 3kvdc, and 50; /archives//html/Amps/2008-05/msg00113.html (11,416 bytes)
169. Re: [Amps] A Grounded Grid biasing question (score: 1): Author: TexasRF@aol.com; Date: Wed, 9 Jul 2008 13:08:45 EDT; Marv, I have used this method in several grounded grid tetrode amplifiers with excellent results. There is an added advantage that a big diode can be placed from B- (cathode) and ground to snub any b; /archives//html/Amps/2008-07/msg00086.html (8,540 bytes)
170. Re: [Amps] Tube sources (score: 1): Author: TexasRF@aol.com; Date: Sat, 26 Jul 2008 10:16:14 EDT; The GS23B aka 4CX1600U is a wonderful tube for the cost. If you are looking for a 1500w output pa at 1296MHZ they are not as wonderful because only 1 in 6 or so will make it to that power level. On t; /archives//html/Amps/2008-07/msg00280.html (9,874 bytes)
171. Re: [Amps] 8877 Advice (score: 1): Author: TexasRF@aol.com; Date: Thu, 31 Jul 2008 10:41:55 EDT; A quick hv leakage test will tell you a lot about the tube(s). This is done without filament power, measured between grid and plate. It is important to make sure the current is limited and one easy w; /archives//html/Amps/2008-07/msg00366.html (9,907 bytes)
172. Re: [Amps] 8877 tests (score: 1): Author: TexasRF@aol.com; Date: Thu, 31 Jul 2008 12:00:28 EDT; I have had exactly the same experience. I am beginning to think that the arc is a required part of the rehab procedure! 73/k5gw In a message dated 7/31/2008 10:52:28 A.M. Central Daylight Time, w0jx@; /archives//html/Amps/2008-07/msg00370.html (7,564 bytes)
173. Re: [Amps] Burning in an 8877 (score: 1): Author: TexasRF@aol.com; Date: Tue, 5 Aug 2008 12:38:56 EDT; There was extensive coverage of this exact subject within the past two weeks. You might want to check the archives for some excellent advice. 73/k5gw In a message dated 8/5/2008 11:10:31 A.M. Central; /archives//html/Amps/2008-08/msg00035.html (8,458 bytes)
174. Re: [Amps] 3-500Z glitch resistor (score: 1): Author: TexasRF@aol.com; Date: Tue, 9 Sep 2008 10:21:24 EDT; I don't recall seeing any info about hv crowbar circuits. Sounds interesting though. Where is the info? 73, Gerald K5GW In a message dated 9/9/2008 6:37:55 A.M. Central Daylight Time, g4ftc@hotmail.c; /archives//html/Amps/2008-09/msg00077.html (9,468 bytes)
175. Re: [Amps] L4 amp question (score: 1): Author: TexasRF@aol.com; Date: Thu, 30 Oct 2008 10:31:10 EDT; Double check input/output cables are connected correctly? Sounds like the drive cable might be connected to the output connector. 73, K5GW In a message dated 10/30/2008 9:27:49 A.M. Central Daylight; /archives//html/Amps/2008-10/msg00143.html (10,131 bytes)
176. Re: [Amps] Ameritron AL-1200 problem -- More info.. (score: 1): Author: TexasRF@aol.com; Date: Mon, 1 Dec 2008 09:13:10 EST; LLoyd, I would suggest you use a different power meter on the output to verify the accuracy of your measurements. With 2500w+ input power and 300w output power, there is a loss of 2200W+. I would exp; /archives//html/Amps/2008-12/msg00008.html (9,187 bytes)
177. Re: [Amps] 2-4CX100A amp (score: 1): Author: TexasRF@aol.com; Date: Fri, 19 Dec 2008 10:44:17 EST; The screen requires a path for current flow to the cathode. If this path has too much resistance or is an open circuit, the screen grid will tend to rise to the plate potential. You can look at the t; /archives//html/Amps/2008-12/msg00265.html (8,925 bytes)
178. Re: [Amps] switchable zener cathode bias (score: 1): Author: TexasRF@aol.com; Date: Wed, 31 Dec 2008 03:53:00 EST; Steve, you can avoid the problem by wiring in the higher voltage zener permanently and using your switch to connect the lower voltage zener in parallel with the higher voltage zener. When both zeners; /archives//html/Amps/2008-12/msg00379.html (8,874 bytes)
179. Re: [Amps] My NCL-2000 warc band experiments (score: 1): Author: TexasRF@aol.com; Date: Sun, 18 Jan 2009 10:55:13 EST; Frank, asking out of curiosity here: did you by chance try 30m with the 20m position and 17m with the 15m position? If there is enough C in the variable caps you might reach resonance without having; /archives//html/Amps/2009-01/msg00149.html (7,429 bytes)
180. Re: [Amps] AL 80B Question (score: 1): Author: TexasRF@aol.com; Date: Mon, 19 Jan 2009 17:04:08 EST; If the input vswr of the amplifier is elevated on 30M your exciter may be reducing drive power to prevent damage. Reduced drive power = reduced output power. You can use a small tuner to reduce the i; /archives//html/Amps/2009-01/msg00172.html (8,556 bytes)

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