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141. [AMPS] Commercial amp design on AMPS (score: 1): Author: k7fm@teleport.com (Lamb); Date: Mon, 16 Oct 2000 18:27:06 -0700; "It was said that: Don't dare ask a question that requires any technical thought or you will get ignored because all the so call EXPERTS here are to busy sniping at each other to be bother with anyth; /archives//html/Amps/2000-10/msg00417.html (9,229 bytes)
142. [AMPS] G2DAF Circuit (score: 1): Author: k7fm@teleport.com (Lamb); Date: Wed, 25 Oct 2000 22:05:21 -0700; A simple question seems to have been the hot button for a good number of hams. When the issue came up some time ago, I breadboarded a beam power tube and monitored the screen and control grid voltage; /archives//html/Amps/2000-10/msg00551.html (9,226 bytes)
143. [AMPS] G2DAF Circuit (score: 1): Author: k7fm@teleport.com (Lamb); Date: Thu, 26 Oct 2000 05:41:24 -0700; All the proponents of grounded grid are violating Rich's Rules - that the voltage on the screen grid of a pentode must have constant voltage to produce an acceptable signal. Yet, in a grounded grid a; /archives//html/Amps/2000-10/msg00566.html (8,461 bytes)
144. [AMPS] G2DAF Circuit (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Thu, 26 Oct 2000 09:31:04 -0700; "Does the fact you measured one bad sweep tube amp suddenly mean the DAF is considered good engineering? (I don't think so.)" I simply stated that some grounded grid amps, which happen to use sweep t; /archives//html/Amps/2000-10/msg00569.html (10,144 bytes)
145. [AMPS] G2DAF Circuit (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Thu, 26 Oct 2000 13:36:48 -0700; "How do you feel about tetrode users who close their minds to the 3/2 Power Law, Colin?" This has previously been discussed. I quoted the language from Eimac here and am in total agreement with their; /archives//html/Amps/2000-10/msg00583.html (8,684 bytes)
146. [AMPS] G2DAF Circuit (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Thu, 26 Oct 2000 14:25:29 -0700; "You can find all sorts of things that aren't true on Web sites. Web sites simply present the owner's personal opinion, presented without any form of peer review. For a good example of this, look at; /archives//html/Amps/2000-10/msg00587.html (9,643 bytes)
147. [AMPS] G2DAF Circuit (score: 1): Author: k7fm@teleport.com (Lamb); Date: Thu, 26 Oct 2000 19:38:47 -0700; The address of the web site with the plots of the Swedish DAF circuit is: http://home3.swipnet.se/~w-30548/g2daf "I would think real "experimentation" would be building a clean amplifier that is prop; /archives//html/Amps/2000-10/msg00597.html (10,085 bytes)
148. [AMPS] G2DAF Circuit (score: 1): Author: k7fm@teleport.com (Lamb); Date: Fri, 27 Oct 2000 05:56:29 -0700; Regarding the 3/2 law, Rich asked?: "In your opinion, what does Eimac say, Colin" "The 3/2 power law simply states that if you change all of the interelectrode voltages applied to a power grid tube b; /archives//html/Amps/2000-10/msg00608.html (10,093 bytes)
149. SV: [AMPS] G2DAF Circuit (score: 1): Author: k7fm@teleport.com (Lamb); Date: Sat, 28 Oct 2000 07:22:20 -0700; "If your DAF amp measures minus 22db total IMD, YOU foolishly selected the wrong tube." Rich, you have continually cited a -22 db 3rd order imd for the "DAF" design. However, when pinned down the las; /archives//html/Amps/2000-10/msg00630.html (10,879 bytes)
150. SV: [AMPS] G2DAF Circuit (score: 1): Author: k7fm@teleport.com (Lamb); Date: Sat, 28 Oct 2000 07:01:40 -0700; ..."the fact remains that circuit does about everything you are not supposed to do with a linear PA. If one or two work, that's fine with me. But it is not a good design. Because one or two of someth; /archives//html/Amps/2000-10/msg00631.html (11,456 bytes)
151. SV: [AMPS] G2DAF Circuit (score: 1): Author: k7fm@teleport.com (Lamb); Date: Sat, 28 Oct 2000 14:39:35 -0700; "Norm's circuit was grid driven. " Rich, I am looking at Norm's circuit on page 157 of the New Sideband Handbook published by Don Stoner. On the left of the schematic, there is a notation that says "; /archives//html/Amps/2000-10/msg00639.html (9,072 bytes)
152. SV: [AMPS] G2DAF Circuit (score: 1): Author: k7fm@teleport.com (Lamb); Date: Sat, 28 Oct 2000 14:44:09 -0700; "To avoid choke fires, keep all resonances at least 6% from amateur bands. Choke resonances should be checked with the hv rf choke wired into the circuit and not shorted." This is an example of bad i; /archives//html/Amps/2000-10/msg00640.html (8,765 bytes)
153. SV: [AMPS] G2DAF Circuit (score: 1): Author: k7fm@teleport.com (Lamb); Date: Sat, 28 Oct 2000 22:38:41 -0700; "? Can you prove that this is the only amplifier that Norm ever constructed?" No! Colin K7FM -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests; /archives//html/Amps/2000-10/msg00645.html (7,681 bytes)
154. [AMPS] High-SWR protection (score: 1): Author: k7fm@teleport.com (Lamb); Date: Sun, 29 Oct 2000 14:35:49 -0800; Hi Chuck: One of the problems with many of the swr protection circuits is that when there is a direct short the measured reflected power may be zero - simply because there is no voltage present becau; /archives//html/Amps/2000-10/msg00661.html (8,316 bytes)
155. [AMPS] High-SWR protection (score: 1): Author: k7fm@teleport.com (Lamb); Date: Sun, 29 Oct 2000 18:04:14 -0800; The rig in question was an Drake TR-5. The rig failed. The coax was found shorted. I replaced the finals and checked the foldback circuit. It worked properly. Not too much later, I repaired an Atlas; /archives//html/Amps/2000-10/msg00664.html (8,419 bytes)
156. [AMPS] High-SWR protection (score: 1): Author: k7fm@teleport.com (Lamb); Date: Mon, 30 Oct 2000 19:06:10 -0800; "I can't think of any way to build a directional coupler that won't show high SWR when the load is shorted. Can anyone think of a way?" That is not the problem. Let me quote my Ten-Tec manual. "ALC s; /archives//html/Amps/2000-10/msg00695.html (10,286 bytes)
157. [AMPS] High-SWR protection (score: 1): Author: k7fm@teleport.com (Lamb); Date: Tue, 31 Oct 2000 05:42:27 -0800; "That's an old and very incorrect wive's tale. Incorrect rumor has it that a 25 ohm load and 25 ohm R will look like 50 ohms and have a 1:1 false SWR reading, or that a 50 ohm impedance (which is not; /archives//html/Amps/2000-10/msg00705.html (9,463 bytes)
158. [AMPS] High-SWR protection (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Tue, 31 Oct 2000 09:20:00 -0800; Hi Steve: Regarding your question of 35 -j35, I come up with an swr of about 2.25, using the Smith Chart. K7FM -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Admin; /archives//html/Amps/2000-10/msg00709.html (8,793 bytes)
159. [AMPS] 30-S1 Question (score: 1): Author: k7fm@teleport.com (Lamb); Date: Wed, 6 Sep 2000 00:46:15 -0700; Perhaps the best reason for changing the final tube in the 30S-1 is that the 4CX1500 is specially designed for linear amplifiers and therefore has a much cleaner output than the 4CX1000. It is rare t; /archives//html/Amps/2000-09/msg00141.html (7,267 bytes)
160. [AMPS] Storing tubes (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Thu, 7 Sep 2000 06:45:44 -0700; It was stated that the worst thing in the world for some tubes is to put them into storage for long periods. I disagree! The worst thing is to pull a perfectly good tube out of your amplifier for som; /archives//html/Amps/2000-09/msg00208.html (6,981 bytes)

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