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221. [AMPS] Swinging Choke Theory (score: 1): Author: k7fm@teleport.com (Lamb); Date: Mon, 27 Mar 2000 21:06:18 -0800; This is a multi-part message in MIME format. --=_NextPart_000_000B_01BF9830.4B6DC340 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable " Someone advertised a; /archives//html/Amps/2000-03/msg00995.html (27,972 bytes)
222. [AMPS] Swinging Choke Theory (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Tue, 28 Mar 2000 09:57:40 -0800; Rich Queried: "What kind of filter is used in the second section?" Answer: A swinging choke preceeded a smoothing choke. Another Question: "What does it take to convert a swinger to fixed L?" Answer:; /archives//html/Amps/2000-03/msg01016.html (8,190 bytes)
223. [AMPS] 3/2 power law and Rich's very wide signal (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Tue, 28 Mar 2000 12:46:32 -0800; "Eimac, Amperex, Philips, Svetlana and RCA recommend regulated screen potential for tetrodes in AB linear service Could they all be out of step except Mr. Thornley?" Boeing, Douglas, DeHaviland, Brit; /archives//html/Amps/2000-03/msg01019.html (9,336 bytes)
224. [AMPS] Northrup and the 3/2 law (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Tue, 28 Mar 2000 15:06:17 -0800; "Northrup left the tail off altogether, though lacking adequate stabilization computers nor an ongoing war for incentive, they put flying wing development behind about 50 years..." Now, the next ques; /archives//html/Amps/2000-03/msg01025.html (9,538 bytes)
225. [AMPS] Is screen potential important? (score: 1): Author: k7fm@teleport.com (Lamb); Date: Thu, 30 Mar 2000 06:32:53 -0800; "In order to achieve linear amplification, current gain must be constant at All signal levels. Screen potential has a large effect on current gain. At 33% of normal screen volts, an 8171 exhibits 1/4; /archives//html/Amps/2000-03/msg01080.html (10,104 bytes)
226. [AMPS] Is screen potential important? (score: 1): Author: k7fm@teleport.com (Lamb); Date: Thu, 30 Mar 2000 06:42:37 -0800; "Not until the screen bypass C becomes sufficiently charged. Another problem is keeping the screen bypass C from mostly discharging on soft syllables." Rich, this is not a problem, except for you. It; /archives//html/Amps/2000-03/msg01081.html (9,649 bytes)
227. [AMPS] Is screen potential important? (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Thu, 30 Mar 2000 09:14:49 -0800; " With any tetrode, to obtain linear suds, one can vary the grid v. Or one can vary the screen v. -- but Not at the same time. In other words, When the grid potential varies, the screen potential mus; /archives//html/Amps/2000-03/msg01085.html (10,548 bytes)
228. [AMPS] The 3/2 Power Law (score: 1): Author: k7fm@teleport.com (Lamb); Date: Fri, 31 Dec 1999 21:23:54 -0800; Rich: That is not my definition of the 3/2 power law. It is Eimac's. "the screen voltage is not critical for most applications and the value used has been chosen as a convenient value consistent with; /archives//html/Amps/2000-01/msg00001.html (7,572 bytes)
229. [AMPS] The 3/2 Power Law (score: 1): Author: k7fm@teleport.com (Lamb); Date: Sat, 1 Jan 2000 06:58:04 -0800; Reference on Eimac's definition of the 3/2 power law. Page 97, Care and Feeding of Power Grid Tubes, copyright 1967 by Varian, third Printing 1978. Re: Pulling out of hat. Rich has cited the measurem; /archives//html/Amps/2000-01/msg00006.html (8,155 bytes)
230. [AMPS] Re: Norm's Circuit (score: 1): Author: k7fm@teleport.com (Lamb); Date: Sat, 1 Jan 2000 14:50:11 -0800; ? The equipment used at the transmitting station was never a consideration. Measurement of transmitted distortion was the whole ballgame. The question is what sort of amplifier was being measured. Ri; /archives//html/Amps/2000-01/msg00015.html (8,516 bytes)
231. [AMPS] Grid current: Rich's Rules of Engagement. (score: 1): Author: k7fm@teleport.com (Lamb); Date: Sun, 2 Jan 2000 08:06:20 -0800; Rich, you are the master of the red herring. You argue that the G2DAF circuit cannot be linear because it draws grid current. Class AB1 does not draw grid currrent. Class AB2 and B is allowed to draw; /archives//html/Amps/2000-01/msg00020.html (8,604 bytes)
232. [AMPS] Final.. (score: 1): Author: k7fm@teleport.com (Lamb); Date: Sun, 2 Jan 2000 14:02:03 -0800; Dear Lars: Yes, we have scrutinized the G2DAF circuitry long enough. Your web site will serve a useful function to allow those interested to explore recent developments, and the website of G3SEK will; /archives//html/Amps/2000-01/msg00026.html (8,540 bytes)
233. [AMPS] ALC (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Thu, 6 Jan 2000 14:19:09 -0800; Hi Ron: If the ALC operates, the rise time of ALC voltage will occur after the amplifier stage has amplified the leading pulse of the signal. If the amplifier can remain linear with the leading pulse; /archives//html/Amps/2000-01/msg00166.html (7,591 bytes)
234. [AMPS] Simplified Approach To Power Measurement (score: 1): Author: k7fm@teleport.com (Lamb); Date: Fri, 14 Jan 2000 17:27:30 -0800; I have found a simpler approach to power measurement, on the air. It requires no complicated formulas or sophisticated equipment. The method outlined below is used on the air in the 75 meter dx windo; /archives//html/Amps/2000-01/msg00300.html (7,385 bytes)
235. [AMPS] Output power question (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Tue, 25 Jan 2000 14:15:33 -0800; Yes, there is a way to predict the correct length of cable to assist you in matching the transmitter to the amplifier. However, the method of prediction is not necessarily simple. The first step is t; /archives//html/Amps/2000-01/msg00523.html (9,158 bytes)
236. [AMPS] Alpha 86 qsk question (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Thu, 2 Dec 1999 13:16:54 -0800; Make sure the first character is not important! -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: o; /archives//html/Amps/1999-12/msg00014.html (8,161 bytes)
237. [AMPS] Metal disc inserts on Alpha 77 (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Fri, 3 Dec 1999 08:40:49 -0800; Hello: I am restoring my Alpha 77SX and need to replace the thin, shiny metal discs on the two main tuning knobs. Anyone know a source for these. Thanks, Colin K7FM -- FAQ on WWW: http://www.contesti; /archives//html/Amps/1999-12/msg00022.html (7,050 bytes)
238. [AMPS] SB-230 re-tube? (score: 1): Author: k7fm@teleport.com (Lamb); Date: Mon, 13 Dec 1999 20:03:20 -0800; Best to pull old tube out before putting new one in. Be sure to pull plug, also. Seriously, the effort you put in to replace the tube with an air cooled tube could be put into finding a used replacem; /archives//html/Amps/1999-12/msg00144.html (7,548 bytes)
239. SV:SV:SV: [AMPS] Tetrode Amp Help (score: 1): Author: k7fm@teleport.com (Lamb); Date: Wed, 15 Dec 1999 06:43:28 -0800; We have probably beat the screen regulation issue to death - but the very nice Collins S-line and M-2 series did not use regulated screen voltage on their final 6146's. As a matter of fact, they were; /archives//html/Amps/1999-12/msg00172.html (10,975 bytes)
240. [AMPS] SV: G2DAF and super cathode (score: 1): Author: k7fm@teleport.com (Lamb); Date: Thu, 16 Dec 1999 16:52:51 -0800; One significant factor regarding the G2DAF is the time delay on the screen voltage. If the dc created by the rectified rf charges a capacitor in the screen circuit and that charging causes a delay in; /archives//html/Amps/1999-12/msg00197.html (7,974 bytes)

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