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161. [Amps] Distortion (score: 1): Author: 2@vc.net (Rich); Date: Wed, 30 Oct 2002 01:05:04 -0800; The Z at max I-cathode is the one that counts. - Rich..., 805.386.3734, www.vcnet.com/measures.; /archives//html/Amps/2002-10/msg00305.html (6,861 bytes)
162. [Amps] Distortion (score: 1): Author: 2@vc.net (Rich); Date: Wed, 30 Oct 2002 05:52:50 -0800; the critical moment is I-peak when anode conduction is maximal. - Rich..., 805.386.3734, www.vcnet.com/measures.; /archives//html/Amps/2002-10/msg00308.html (7,684 bytes)
163. [Amps] Distortion (score: 1): Author: 2@vc.net (Rich); Date: Wed, 30 Oct 2002 11:22:09 -0800; If maximum power transfer does not occur at I-peak, then what happens? To: <amps@contesting.com> - Rich..., 805.386.3734, www.vcnet.com/measures.; /archives//html/Amps/2002-10/msg00310.html (8,693 bytes)
164. [Amps] Glitch resistors (score: 1): Author: 2@vc.net (2); Date: Sun, 1 Sep 2002 02:24:32 -0700; We buy Ohmite glass-coated/vitreous resistors for glitch service. They are not as tough as high-energy discharge type resistors, but they cost Much less $$. A 10-ohm, 10Wer will discharge a 3kV SB-22; /archives//html/Amps/2002-09/msg00000.html (8,190 bytes)
165. [Amps] Glitch resistors (score: 1): Author: 2@vc.net (2); Date: Mon, 2 Sep 2002 04:34:02 -0700; Any that survive the short to ground test, sans-fireworks are up to the job. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-09/msg00010.html (7,255 bytes)
166. [Amps] 4CX400A (score: 1): Author: 2@vc.net (2); Date: Tue, 3 Sep 2002 09:32:11 -0700; The 4cx400 is not rated for as high a V as the 4-400A/C. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-09/msg00020.html (6,786 bytes)
167. [Amps] L4B Problem (score: 1): Author: 2@vc.net (2); Date: Thu, 5 Sep 2002 09:53:40 -0700; C. 65-ohms. This should work to check the tuned input without drive. yes. What Drake used in the days of tube-type exciters may not be optimal for solid-state exciters. A Q of 2 - 3 is what's needed; /archives//html/Amps/2002-09/msg00039.html (7,952 bytes)
168. [Amps] mounting a vac variable (score: 1): Author: 2@vc.net (2); Date: Mon, 9 Sep 2002 05:11:37 -0700; Jennings recommends vertical mounting - driven by a right-angle drive. Multronics-Cardwell makes an ideal right-angle drive for this purpose. It replaces the original allen-screw fastened shaft-colle; /archives//html/Amps/2002-09/msg00057.html (7,707 bytes)
169. [Amps] Amps to make (score: 1): Author: 2@vc.net (2); Date: Mon, 9 Sep 2002 10:31:37 -0700; 2, 4-1000As will make about 1/3 as much suds as a nice tetrode with handles. and the tetrode (8171, et cetera) takes less drive power. On the other hand, the tetrode also has less feedback C, which; /archives//html/Amps/2002-09/msg00059.html (6,941 bytes)
170. [Amps] 800H questions (score: 1): Author: 2@vc.net (2); Date: Wed, 11 Sep 2002 09:12:40 -0700; ** 1.2db makes no perceptable difference at the RX end on MF/HF. ** This suggests that the 3cx800s have Ba migration from the cathode to the grid. To reduce the rate of barium migration, operate the; /archives//html/Amps/2002-09/msg00078.html (9,287 bytes)
171. [Amps] amp smoked now (score: 1): Author: 2@vc.net (2); Date: Wed, 11 Sep 2002 09:12:47 -0700; ** It night be a good idea to measure the inrush-current at turn on. with an o'scope and a 1m-ohm current shunt. My guess is that it's over 30mV = 30A-pk. - R. L. Measures, a.k.a. Rich..., 805.386.3; /archives//html/Amps/2002-09/msg00079.html (8,256 bytes)
172. [Amps] amp smoked now (score: 1): Author: 2@vc.net (2); Date: Wed, 11 Sep 2002 09:12:45 -0700; Step-start and a replacement switch should do the trick. The reason Ameritron apparently left out a step-start is that they would like customers to purchase theirs separately. TL-922s also need a ste; /archives//html/Amps/2002-09/msg00080.html (6,795 bytes)
173. [Amps] Tank Circuit Help (score: 1): Author: 2@vc.net (2); Date: Wed, 11 Sep 2002 18:16:32 -0700; Very few roller coils have as large a conductor as is needed for 10m, so it is a common practice to operate on 10m with zero-turns on the roller and the rest of the needed L from a heavy Cu conductor; /archives//html/Amps/2002-09/msg00088.html (7,435 bytes)
174. [Amps] NEED 10 -470K RESISTORS @2 WATTS (score: 1): Author: 2@vc.net (2); Date: Fri, 13 Sep 2002 08:14:52 -0700; You need resistors that will change resistance with age? If you don't, Mouser sells film-type 470k/2Wers that are more stable. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/meas; /archives//html/Amps/2002-09/msg00097.html (7,295 bytes)
175. [Amps] A general question about why anodes get hot (score: 1): Author: 2@vc.net (2); Date: Wed, 18 Sep 2002 10:05:06 -0700; Tube-type amplifiers dissipate roughly half as much heat as the amount of RF they produce. Electrons impacting the anode. cheers, Kim - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.c; /archives//html/Amps/2002-09/msg00129.html (8,428 bytes)
176. [Amps] Amplifier Power Supply Ripple (score: 1): Author: 2@vc.net (2); Date: Thu, 19 Sep 2002 13:24:08 -0700; It's lower for AM service than for SSB. A friend ran a 2uF filter in a 7000V power supply for a 4-1000A running SSB. It sounded hum-free. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcne; /archives//html/Amps/2002-09/msg00150.html (6,651 bytes)
177. [Amps] ALPHA 77 SX STATUS (score: 1): Author: 2@vc.net (2); Date: Fri, 20 Sep 2002 19:47:06 -0700; This does not explain heater burnout because insufficient warm-up can result only in cathode flaking. Did you perform the Funderberg loose gold test? Would you sell me the kaput tubes? cheerz, Bob -; /archives//html/Amps/2002-09/msg00159.html (7,297 bytes)
178. [Amps] Tank tweaking (score: 1): Author: 2@vc.net (2); Date: Sun, 22 Sep 2002 15:47:39 -0700; ** What is the RL and the Q ? tnx ** 800pF is not small for 160m because the Z is not low. RFParts ** 1000pF at 1.8MHz (88-ohms) is not enough to keep RF out of the PS. ** Sounds good. - R. L. Measu; /archives//html/Amps/2002-09/msg00185.html (8,094 bytes)
179. [Amps] High-potential tester transformer FS (score: 1): Author: 2@vc.net (2); Date: Sun, 22 Sep 2002 15:47:45 -0700; Transformer, potted, 115vac pri /sec 15,000vac/30mA current-limiting. Will produce 42kVdc in FWD configuration. Recommended filter C 2 x 0.01uF or so. Price $42 (a buck per kV) plus UPS. Secondary CT; /archives//html/Amps/2002-09/msg00186.html (6,588 bytes)
180. [Amps] Fw: Tank tweaking (score: 1): Author: 2@vc.net (2); Date: Sun, 22 Sep 2002 20:24:31 -0700; ** However, the DC blocker cap dissipates virtually no power. More Xc ohms results in a slightly different setting of the Tune & Load caps, but no change in P out. - R. L. Measures, a.k.a. Rich...,; /archives//html/Amps/2002-09/msg00195.html (11,062 bytes)

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