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161. Re: [Amps] E-core transformer (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Mon, 02 Dec 2013 01:44:23 +0100; OK Larry, we may need to notch this up a bit, Try witchcraft, for which you need to sacrifice a virgin if you can find one........the exact method of sacrifice is left to you as it isn't specified...; /archives//html/Amps/2013-12/msg00010.html (9,165 bytes)
162. Re: [Amps] Why do commercial makers parallel up small value caps in pi circuits? (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Wed, 04 Dec 2013 12:12:45 +0100; The most extreme use of the technique I've seen was some 50 years ago in a 50kW (output)long wave (50kHz region) tx at Marconi, where something like 50 or 60 ceramic capacitors of about 68pF and 5kVA; /archives//html/Amps/2013-12/msg00015.html (7,335 bytes)
163. Re: [Amps] 5000v wide capacitance vacuum variabke (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Wed, 04 Dec 2013 17:27:51 +0100; Try Max Gain systems http://www.mgs4u.com/index.html#microwave 73 Peter G3RZP == Message Received: Dec 04 2013, 03:54 PM From: "jonkd4mpw@yahoo.com" <jonkd4mpw@yahoo.com> To: amps@contesting.com Cc:; /archives//html/Amps/2013-12/msg00023.html (8,032 bytes)
164. Re: [Amps] Why do commercial makers parallel up small value capsinpi circuits? (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Wed, 04 Dec 2013 17:31:39 +0100; Max gain systems can sell them to you. Starting around $250, and where you need that sort of value, on the loading side, way OTT on voltage for what is needed. You can buy a lot of NP0 doorknobs for; /archives//html/Amps/2013-12/msg00024.html (8,786 bytes)
165. Re: [Amps] blower advice? (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Wed, 04 Dec 2013 19:13:19 +0100; Jim, Are the bearings sealed? Is it possible the lubrication has dried up? I'm not sure what lubrication is best for ball bearings - some people say grease, and others, oil. I prefer grease although; /archives//html/Amps/2013-12/msg00026.html (9,001 bytes)
166. Re: [Amps] PARALLEL CAPS IN OUTPUT (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Wed, 04 Dec 2013 19:49:04 +0100; If one is to believe Philip H. Smith in 'Electronic Applications of the Smith Chart', McGraw-Hill 1969, page 6, Fig 1.3, the maximum voltage appearing on a lossless transmission line with an SWR of i; /archives//html/Amps/2013-12/msg00028.html (9,285 bytes)
167. Re: [Amps] PARALLEL CAPS IN OUTPUT (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Thu, 05 Dec 2013 00:08:34 +0100; Larry, the argument used by all the authorities is this: At an open circuit the forward voltage is Vf. Because it is reflected as VR and is the same voltage - necessarily - the two voltages add to gi; /archives//html/Amps/2013-12/msg00037.html (18,690 bytes)
168. Re: [Amps] PARALLEL CAPS IN OUTPUT (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Thu, 05 Dec 2013 01:14:41 +0100; This is where life gets interesting....... About ten or twelve years back, there was a big argument about whether you should have a conjugate match between PA and load. Argument one was that Thevenin; /archives//html/Amps/2013-12/msg00042.html (10,712 bytes)
169. Re: [Amps] Arctic Silver (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Thu, 12 Dec 2013 11:40:30 +0100; Steve, If the copper has been rolled there will have been some work hardening. It could well be worthwhile annealing it BEFORE doing the final milling. Same as one does for BMS (Bright Mild Steel) An; /archives//html/Amps/2013-12/msg00094.html (8,660 bytes)
170. Re: [Amps] Is this tube anygood for a monoband 80meter GG amp (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Sun, 15 Dec 2013 22:08:27 +0100; Short answer is "No". A mu of 20 is too low to be very useful in GG. As a swamped grid driven, grounded cathode Class AB2 amplifier with shunt regulated bias supply, quite possibly, although you woul; /archives//html/Amps/2013-12/msg00116.html (8,797 bytes)
171. Re: [Amps] Dual 8877 HF amplifier RF design (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Sun, 15 Dec 2013 22:11:21 +0100; Of course, you wouldn't actually use it on the air for just the 400 watts PEP output for which almost all G stations are licenced at HF... == Message Received: Dec 15 2013, 05:48 PM From: radio@modes; /archives//html/Amps/2013-12/msg00117.html (8,470 bytes)
172. Re: [Amps] Meters for HB amps? (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Sat, 28 Dec 2013 10:25:28 +0100; Fair radio have a number in the $8 - $10 range https://www.fairradio.com/catalog.php?mode=view&categoryid=3984 73 Peter G3RZP == Message Received: Dec 27 2013, 06:53 PM From: TexasRF@aol.com To: stev; /archives//html/Amps/2013-12/msg00154.html (8,980 bytes)
173. Re: [Amps] Runaway Plate Current (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Sat, 28 Dec 2013 23:27:01 +0100; I sent basically the same comment four hours ago, but such are the marvels of the internet, it has disappeared. probably resurface ina couple of months..... But, yes, I totally agree with Gary. 73 Pe; /archives//html/Amps/2013-12/msg00163.html (9,028 bytes)
174. Re: [Amps] Runaway Plate Current (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Sun, 29 Dec 2013 17:14:57 +0100; The NCL 2000 used a pair of 8122s, I believe. The RCA data sheet says a maximum screen supply impedance of 10kohm for them and does not say that you can get negative screen grid current. The 4X150 ca; /archives//html/Amps/2013-12/msg00168.html (11,778 bytes)
175. Re: [Amps] Runaway Plate Current (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Mon, 30 Dec 2013 11:03:00 +0100; I agree that biasing the control grid off is better. Because of negative screen current, an active (rather than VR tubes or zeners) shunt regulator is best, and not difficult to do, although the heav; /archives//html/Amps/2013-12/msg00179.html (7,466 bytes)
176. Re: [Amps] "N" Connector (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Mon, 30 Dec 2013 11:20:03 +0100; The current density on the centre pin of an N connector running 1kW at 432 is enormous. Skin depth in thousands of an inch is 2.6 divided by the sq. root of the frequency in MHz, or 1.25 times 10E-3; /archives//html/Amps/2013-12/msg00180.html (6,830 bytes)
177. Re: [Amps] Ā Runaway Plate Current (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Mon, 30 Dec 2013 17:28:28 +0100; You can never bias a tube completely off with a cathode resistor, although you can reduce the plate current to a very low value - no cathode current, no drop across the resistor, hence no bias. With; /archives//html/Amps/2013-12/msg00185.html (9,382 bytes)
178. Re: [Amps] negative screen current (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Mon, 30 Dec 2013 20:31:43 +0100; I too have a problem with this explanation. Electrons gathered by the screen are 'positive' current flow, no matter where they come from: 'negative' flow must surely be electrons leaving the screen.; /archives//html/Amps/2013-12/msg00192.html (10,256 bytes)
179. Re: [Amps] negative screen current (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Mon, 30 Dec 2013 21:17:46 +0100; Were that to be so Don, then all screens would emit electrons, which we know is not the case. There is a problem between 'electron current flow' and 'conventional current flow' here. Screens collect; /archives//html/Amps/2013-12/msg00194.html (8,432 bytes)
180. Re: [Amps] negative screen current (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Mon, 30 Dec 2013 23:22:17 +0100; Peter, Please explain then how electrons from the electron stream cathode - grid 1 - grid 2 - anode that are intercepted by the screen grid are different to those that hit the screen grid because the; /archives//html/Amps/2013-12/msg00199.html (12,011 bytes)

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