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121. [AMPS] Roller Inductor v. Bandswitch (score: 1): Author: k7fm@teleport.com (Lamb); Date: Wed, 7 Feb 2001 02:19:46 -0800; One other possibility - which has not been mentioned - is a fairly simple approach. Ask yourself how many bands you will really use the amplifier on. In my case, I have about 10 amplifiers. All are b; /archives//html/Amps/2001-02/msg00175.html (7,785 bytes)
122. [AMPS] runaway amp. (score: 1): Author: k7fm@teleport.com (Lamb); Date: Fri, 23 Feb 2001 17:21:28 -0800; I now recall working on an Alpha 77 that had a similar problem. Power output creeped upward. After awhile, the amp became very efficient. It took a bit longer than it should have taken for me to real; /archives//html/Amps/2001-02/msg00316.html (7,754 bytes)
123. [AMPS] K2RIW Amps (score: 1): Author: k7fm@teleport.com (Lamb); Date: Sun, 25 Feb 2001 13:38:35 -0800; I think for EME work, good means putting out enough power to be barely heard by someone 100 miles away after bouncing off the moon. Quality is less important than being heard. Longevity of the tube i; /archives//html/Amps/2001-02/msg00335.html (8,282 bytes)
124. [AMPS] Eimac - Care and Feeding of Power Grid Tubes (score: 1): Author: k7fm@teleport.com (Lamb); Date: Sun, 7 Jan 2001 08:52:05 -0800; "My point is that it's wrong to attribute personal blame. We don't know who was responsible for demanding that C&F be updated on the cheap with no significant budget, but I'll bet it wasn't the unfor; /archives//html/Amps/2001-01/msg00240.html (11,072 bytes)
125. [AMPS] Fertility (score: 1): Author: k7fm@teleport.com (Lamb); Date: Wed, 31 Jan 2001 06:40:33 -0800; A friend's metal bladed wind generator at the top of the hill used to bother many of his neighbors television sets. Ghosts would appear in direct relation to the wind speed. Colin K7FM -- FAQ on WWW:; /archives//html/Amps/2001-01/msg00763.html (7,932 bytes)
126. [AMPS] RCA (score: 1): Author: k7fm@teleport.com (Lamb); Date: Wed, 31 Jan 2001 06:14:50 -0800; "I would like to see RCA's diagram of neutralized g-g 811s." RCA's circuit for neutralizing a gg amplifier is on page 302 of "RCA Transmitting Tubes Technical Manual TT-5". "I would like to see a dia; /archives//html/Amps/2001-01/msg00764.html (7,607 bytes)
127. [AMPS] Choke series resonance clarification (score: 1): Author: k7fm@teleport.com (Lamb); Date: Sat, 9 Dec 2000 16:56:51 -0800; "Creative Electronics uses a very "creative" approach to choke design that works 99% of the time without measuring and pruning. A 38 uh choke is installed in series with a 180 uh choke; the 180 uh ch; /archives//html/Amps/2000-12/msg00166.html (9,688 bytes)
128. [AMPS] DC Filaments??? (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Thu, 2 Nov 2000 08:18:09 -0800; Statement: "With the advent of radially-finned anodes this advice is out of date. Tubes should only be swapped from back to front!" Question: Shouldn't the tubes be inverted every 6 months to even ou; /archives//html/Amps/2000-11/msg00022.html (8,625 bytes)
129. [AMPS] AC on the plates??? (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Thu, 2 Nov 2000 09:58:28 -0800; For a distinctive cw sound, try putting ac directly on the plates of the 813's, similar to designs of the 30's. It saves having to install rectifiers and generally clears a path similar to Norm's gat; /archives//html/Amps/2000-11/msg00025.html (8,701 bytes)
130. SV: [AMPS] SB-220 Glitch Resistor ??? (score: 1): Author: k7fm@teleport.com (Lamb); Date: Thu, 30 Nov 2000 07:24:20 -0800; "You're forgetting that the only HV faults that ever appear are because of parasitics!" The only possible explanation for this is parasitics in the power supply. Perhaps it should be recommended to p; /archives//html/Amps/2000-11/msg00453.html (9,998 bytes)
131. [AMPS] High-SWR protection (score: 1): Author: k7fm@teleport.com (Lamb); Date: Tue, 31 Oct 2000 18:00:52 -0800; "I'm not "anxious to criticize", the statement in the Ten Tec manual is simply incorrect. Reactance causes reflected voltage to appear in the directional coupler just as much as resistance errors do.; /archives//html/Amps/2000-10/msg00005.html (11,377 bytes)
132. [AMPS] Bird meters (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Mon, 2 Oct 2000 08:56:13 -0700; Are you willing to pay for the shipping of the holes, Carsten, and what about customs? British cutoms may want a Certificate of Origin. If they come to the US, then we need a certificate that childre; /archives//html/Amps/2000-10/msg00047.html (9,147 bytes)
133. [AMPS] Bill Orr (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Tue, 3 Oct 2000 16:11:33 -0700; W6SAI is my hero. Read much of the stuff he has written. The correct stuff I know about amplifiers is due to his books and magazine articles. I take full credit for the incorrect stuff. Still remembe; /archives//html/Amps/2000-10/msg00077.html (8,285 bytes)
134. [AMPS] 811A Filament Voltage (score: 1): Author: k7fm@teleport.com (Lamb); Date: Fri, 6 Oct 2000 18:09:29 -0700; Mike asks: "Can anyone tell me the reliability consequences of running the filament voltage on a set of 811As a little on the low side? Specification is 6.3VAC. At Vline = 114.4 VAC, I am measuring V; /archives//html/Amps/2000-10/msg00111.html (8,022 bytes)
135. [AMPS] amp project: 4-400s X 4 (score: 1): Author: k7fm@teleport.com (Lamb); Date: Sun, 8 Oct 2000 18:51:03 -0700; Marv suggests using the old computer power supplies to provide regulated filament voltages for PA tubes. Marv, you really know how to spoil a guy's day. I collect old tubes, old transformers, old rad; /archives//html/Amps/2000-10/msg00130.html (8,726 bytes)
136. [AMPS] MFJ-259B Question (score: 1): Author: k7fm@teleport.com (Lamb); Date: Tue, 10 Oct 2000 03:18:23 -0700; Hi Michael: What you describe sounds like measurement error of the MFJ unit and proof that there is a difference between a $250 piece of test equipment and a $10,000 unit. Probably the greatest accur; /archives//html/Amps/2000-10/msg00168.html (8,422 bytes)
137. [AMPS] Switches (score: 1): Author: k7fm@teleport.com (Lamb); Date: Wed, 11 Oct 2000 20:27:20 -0700; Hi Phil: Take a look at the Henry amplifier. Instead of using a wafer switch, at least some of the amps use a group of cams to operate switches. It would be fairly easy to duplicate those cams to mak; /archives//html/Amps/2000-10/msg00196.html (8,578 bytes)
138. [AMPS] Switches (score: 1): Author: k7fm@teleport.com (Lamb); Date: Thu, 12 Oct 2000 07:00:49 -0700; It is possible to construct an output switch using standard components that greatly exceeds the normal switch voltage ratings. By using a separate wafer for each band and having each wafer separated; /archives//html/Amps/2000-10/msg00230.html (9,291 bytes)
139. [AMPS] Switches (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Thu, 12 Oct 2000 08:48:57 -0700; If the rotor is not connected to anything, the spacing between the rotor and the contact is unimportant. By using adjacent contacts on the wafer as the switch - with the rotor simply acting as a conn; /archives//html/Amps/2000-10/msg00238.html (8,987 bytes)
140. [AMPS] A new band switch (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Thu, 12 Oct 2000 13:38:55 -0700; This is a multi-part message in MIME format. --=_NextPart_000_0007_01C03451.C42C3240 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Here is a proposal for; /archives//html/Amps/2000-10/msg00248.html (16,220 bytes)

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