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201. [Amps] al80a (score: 1): Author: 2@vc.net (2); Date: Sat, 3 Aug 2002 04:54:08 -0700; ** The factory never errs ? ** Why ? ** 1N5400-series rectifiers begin conducting c. 0.5V @25ºC. ** Putting glitch diodes in parallel with the meter movement protects the meter. If the meter is; /archives//html/Amps/2002-08/msg00040.html (9,242 bytes)
202. [Amps] ALPHA 77 (score: 1): Author: 2@vc.net (2); Date: Sat, 3 Aug 2002 12:13:35 -0700; This is pretty common if the ZSAC isn't right with the zener, or if a mysterious burst in cathode current caused the orig zener to short. // There are some trade-offs with the RF-actuated electronic; /archives//html/Amps/2002-08/msg00047.html (10,427 bytes)
203. [Amps] al80a (score: 1): Author: 2@vc.net (2); Date: Sat, 3 Aug 2002 12:13:38 -0700; ** I am influnced by the (X x I) V-drop from c.1A passing through an 88-ohm reactance. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-08/msg00048.html (8,390 bytes)
204. [Amps] meter internal R value, quick and easy. (score: 1): Author: 2@vc.net (2); Date: Sat, 3 Aug 2002 12:13:41 -0700; Thanks to the large Christian church in Europe that toasted c. 30k-witches prior to 1830. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-08/msg00049.html (7,925 bytes)
205. [Amps] ALPHA 77 (score: 1): Author: 2@vc.net (2); Date: Sun, 4 Aug 2002 05:28:58 -0700; Why would one need to tune for grid-current ? Minimal grid current does not give a correct tune. Maximal grid-current does not give a correct tune. A correct tune is max out with the drive needed to; /archives//html/Amps/2002-08/msg00053.html (8,964 bytes)
206. [Amps] ALPHA 77 (score: 1): Author: 2@vc.net (2); Date: Sun, 4 Aug 2002 16:16:34 -0700; True, Phil, but the 8877 is so clean that there are no transceivers even in the same league. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-08/msg00058.html (8,547 bytes)
207. [Amps] suppressors (score: 1): Author: 2@vc.net (2); Date: Sun, 4 Aug 2002 18:58:59 -0700; Go for it, Tom. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-08/msg00062.html (7,236 bytes)
208. [Amps] ALPHA 77 (score: 1): Author: 2@vc.net (2); Date: Sun, 4 Aug 2002 19:05:24 -0700; Good point, Conrad. All it would take to make a solid-state final unit cleaner is some neg. feedback R in the emitter or source leads. This would be easy to do with 50v transistors. - R. L. Measures; /archives//html/Amps/2002-08/msg00063.html (9,549 bytes)
209. [Amps] Plate blocking cap (score: 1): Author: 2@vc.net (2); Date: Sun, 4 Aug 2002 19:09:43 -0700; Only when the silver solder melts [430ºF], runs out and the threaded header falls off. Doorknob caps typically fail from a short through the barium titanate dielectric. ... - R. L. Measures, a.k; /archives//html/Amps/2002-08/msg00064.html (6,454 bytes)
210. [Amps] ALPHA 77 (score: 1): Author: 2@vc.net (2); Date: Mon, 5 Aug 2002 07:42:31 -0700; ** Heavier loading means less load-C. Are you saying that less load C shunting the output reduces harmonics? - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-08/msg00068.html (8,806 bytes)
211. [Amps] suppressors (score: 1): Author: 2@vc.net (2); Date: Mon, 5 Aug 2002 07:42:26 -0700; ** The purpose of a parasitic suppressor in a HF amplifier is to de-Q the VHF anode-resonant circuit formed by the anode-C, the anode lead inductance, and the Tune-C. The reason we would like to de-; /archives//html/Amps/2002-08/msg00069.html (13,736 bytes)
212. [Amps] suppressors (score: 1): Author: 2@vc.net (2); Date: Mon, 5 Aug 2002 08:18:36 -0700; ** A parasitic suppressor's design is a compromise that hinges on the dissipative capability of R-sup. To wit: If R-sup burns out at 29MHz, VHF oscillation becomes substantially more possible. Howeve; /archives//html/Amps/2002-08/msg00070.html (7,960 bytes)
213. [Amps] Re: [Amps] suppressors (score: 1): Author: 2@vc.net (2); Date: Mon, 5 Aug 2002 15:08:39 -0700; ** The AL-1500 (1, 8877) is the only HF amplifier I know of that has no vhf suppressor. [Figure 24.1 on my Web site] ** In HF g-g, the problem is not stability at the frequency in use, it's stabilit; /archives//html/Amps/2002-08/msg00073.html (7,836 bytes)
214. [Amps] ALPHA 77 (score: 1): Author: 2@vc.net (2); Date: Mon, 5 Aug 2002 16:46:46 -0700; So a few % heavier loading has no noticable effect on harmonics. tnx, Paul - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-08/msg00075.html (8,287 bytes)
215. [Amps] Loading terminology (score: 1): Author: 2@vc.net (2); Date: Mon, 5 Aug 2002 21:15:33 -0700; Lighter-loading (more Load-C) means the anode's peak-V is allowed to move up and down farther. Heavy-loading allows less movement. Heavier loading generally provides less IMD. - R. L. Measures, a.k.a; /archives//html/Amps/2002-08/msg00079.html (7,024 bytes)
216. [Amps] ALPHA 77 (score: 1): Author: 2@vc.net (2); Date: Mon, 5 Aug 2002 21:44:38 -0700; Heavier loading makes the amplifier more linear - but it does not change harmonic suppression. You missed nothing, Pat. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. e; /archives//html/Amps/2002-08/msg00080.html (9,448 bytes)
217. [Amps] Re: [Amps] Re: [Amps] suppressors (score: 1): Author: 2@vc.net (2); Date: Tue, 6 Aug 2002 17:26:30 -0700; ** No one uses a VHF suppressor in a VHF amplifier. ** With 0.7pF of feedback C, si. The 3cx1200Z7 has c. 1/10 as much. ciao, Mauri - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com; /archives//html/Amps/2002-08/msg00084.html (6,959 bytes)
218. [Amps] ALPHA 77 (score: 1): Author: 2@vc.net (2); Date: Thu, 8 Aug 2002 11:38:52 -0700; it's true, but the imd improvement is minimal. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-08/msg00092.html (9,391 bytes)
219. [Amps] ALPHA 77 (score: 1): Author: 2@vc.net (2); Date: Fri, 9 Aug 2002 14:04:09 -0700; The improvement is slight and virtually un-noticeable with the current crop of Ham transceivers. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-08/msg00094.html (9,684 bytes)
220. [Amps] MLA2500 power up...... (score: 1): Author: 2@vc.net (2); Date: Sat, 10 Aug 2002 10:25:20 -0700; Disconnect the hv from the 8875s, If it stops blowing fuses, the problem is inside the tubes. To test the tubes for current leakage, use a high-pot tester set to 5kV. Anything over 10uA-cold anode-gr; /archives//html/Amps/2002-08/msg00098.html (7,289 bytes)

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