Mail Archive Search: <+from:rakefet@rakefet.com>

Results:

References: [ +from:rakefet@rakefet.com: 234 ]

Total 234 documents matching your query.

161. [AMPS] explain this one (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sat, 31 Jul 1999 14:36:48 -0700; Rich, If the tank is resonated with too-light loading, the 'loaded' Q of the circuit will be much higher and so will the voltage. This can happen due to an inexperienced operator or antenna switching; /archives//html/Amps/1999-07/msg00664.html (8,291 bytes)
162. [AMPS] Purpose of components on SB-1000 (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Thu, 10 Jun 1999 07:22:23 -0700; Actually I find the grid current meter very useful as an indication of the degree of loading. It's also quite easy to cause excessive grid current to flow with a 100w exciter, and it's a good warning; /archives//html/Amps/1999-06/msg00342.html (8,419 bytes)
163. [AMPS] Finally - a real amp (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Fri, 11 Jun 1999 07:32:18 -0700; The single 3-500Z can be tuned and loaded to 550ma single tone (CW) for a very short period in order to establish the correct operating conditions for the peak of the SSB signal. It should then be dr; /archives//html/Amps/1999-06/msg00386.html (9,992 bytes)
164. [AMPS] measuring meter shunt resistance (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Thu, 17 Jun 1999 22:24:37 -0700; There are ways of doing it, but maybe you should consider a different method: Put a 1 or 10 ohm resistor in series with the circuit. Then use a multiplier resistance to convert your milliammeter to a; /archives//html/Amps/1999-06/msg00513.html (8,600 bytes)
165. [AMPS] Solid-state relay question (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sun, 20 Jun 1999 09:35:55 -0700; I have a solid-state relay rated at 45 amps, 277 volts. I would like to use it in the primary circuit of my plate supply, which has a 2400 va ccs transformer in it. Is there any reason not to use thi; /archives//html/Amps/1999-06/msg00534.html (7,443 bytes)
166. [AMPS] Solid-state relay question (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sun, 20 Jun 1999 11:04:51 -0700; The design has a 25-amp 250v DPST toggle switch as a safety switch first. Then the relay will be controlled by a couple of smaller toggle switches, interlock, etc. in series. My practice is always to; /archives//html/Amps/1999-06/msg00539.html (8,029 bytes)
167. [AMPS] Solid-state relay question (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sun, 20 Jun 1999 11:29:34 -0700; Well, the secondary resistance is 26 ohms and the capacitor is 30 mf. I haven't measured the peak current, since I don't know how to do that! The relay is an Opto 22 type 240D45; the catalogs I have; /archives//html/Amps/1999-06/msg00540.html (8,150 bytes)
168. [AMPS] Dentron GLA-1000 Filter Capacitors (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Tue, 22 Jun 1999 18:09:50 -0700; You can certainly use *four* 450v capacitors of 120 mf each to be on the safe side. That would give you 30 mf instead of 33, but I'm sure it will be fine. 73, Vic, K2VCO Fresno CA -- FAQ on WWW: http; /archives//html/Amps/1999-06/msg00580.html (7,577 bytes)
169. [AMPS] Neutralizing HB amp (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Thu, 24 Jun 1999 08:05:57 -0700; Is this a bridge neutralizing circuit, in which the Cn is connected to the bottom of the grid tuned circuit, which is grounded via a second capacitor? If so, you can increase the value of this second; /archives//html/Amps/1999-06/msg00652.html (8,151 bytes)
170. [AMPS] Another doorknob question: (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Thu, 24 Jun 1999 08:17:07 -0700; I have a capacitor marked only 'Sprague 1000MMFD6KVDC'. It's about 1" (2.5cm) diameter and 5/8" (1.56cm) thick. Is this a 'TV doorknob'? I had planned to use it for a blocking capacitor for my 1500-w; /archives//html/Amps/1999-06/msg00654.html (7,056 bytes)
171. [AMPS] Re: Another Doorknob Query (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Thu, 24 Jun 1999 16:39:03 -0700; Any suggestions on sources for such capacitors? 73, Vic, K2VCO Fresno CA -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@co; /archives//html/Amps/1999-06/msg00675.html (7,339 bytes)
172. [AMPS] Plate transformer, chimneys (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sun, 02 May 1999 10:03:47 -0700; I've got just about all of the parts for my 2 x 3-500z amplifier except the plate transformer. I haven't been able to find one of reasonable size and weight inexpensively, so I'm thinking about buyin; /archives//html/Amps/1999-05/msg00008.html (7,905 bytes)
173. [AMPS] Transformer choice (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Mon, 17 May 1999 16:43:16 -0700; I've been reading the traffic here about transformers and power supply types, with the intent of picking a transformer (the *last* big missing piece) for my 2 x 3-500z amplifier project. To remind ev; /archives//html/Amps/1999-05/msg00202.html (7,489 bytes)
174. [AMPS] Coil stock needed (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Mon, 17 May 1999 17:05:48 -0700; I need some b&w or airdux coil stock. I am interested in 2-1/2 to 3" diameter sizes, #10 or #12 wire, 4, 6, or 8 tpi. Yes, I wish I could have gone to Dayton. 73, Vic, K2VCO Fresno CA -- FAQ on WWW:; /archives//html/Amps/1999-05/msg00203.html (6,612 bytes)
175. [AMPS] Power supply question (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sat, 22 May 1999 09:49:29 -0700; I am planning the power supply for my amp. One problem is that I have a 115v blower (draws 1 amp) and a 115v filament transformer (about 1.3 amps), and I'm possibly going to move overseas where only; /archives//html/Amps/1999-05/msg00282.html (7,517 bytes)
176. [AMPS] 'Glassmike' for blocking cap (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sun, 23 May 1999 12:16:35 -0700; A guy on ebay is advertising Glassmike .04mfd @ 5 kvdc capacitors. Any opinions on how this would do as a plate blocking capacitor for an HF amp with 3kv on the plates? It looks large enough to have; /archives//html/Amps/1999-05/msg00291.html (7,012 bytes)
177. [AMPS] Tube load resistance calculation (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Wed, 26 May 1999 09:31:43 -0700; My ARRL handbook gives the following formula for calculating the load resistance of a vacuum tube power amplifier: Vp Rl = -- KIp where K is 1.5 for class AB, 1.57 for class B, and 2 for class C. I'm; /archives//html/Amps/1999-05/msg00306.html (7,428 bytes)
178. [AMPS] WTB: Sockets for 3-500Z's (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Thu, 01 Apr 1999 08:52:41 -0800; Wanted, a pair of GOOD 3-500Z sockets. I'll consider either the flat type of the air-system type, if the price is right. 73, Vic, K2VCO Fresno CA -- FAQ on WWW: http://www.contesting.com/ampfaq.html; /archives//html/Amps/1999-04/msg00014.html (7,052 bytes)
179. [AMPS] Oron 3-500z sockets at Fair Radio (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Thu, 01 Apr 1999 17:37:53 -0800; Several people pointed me to Fair Radio sales, which has new Oron sockets that look like they would work with a pressurized chassis & chimneys, for $47 a pair. Has anyone any experience with these? 7; /archives//html/Amps/1999-04/msg00024.html (7,387 bytes)
180. [AMPS] Cathode-driven questions (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sun, 11 Apr 1999 07:16:29 -0700; In planning my 2 x 3-500z gg amp, I've been looking at schematics of similar units, and there are a couple of questions that have arisen: 1) Some of them do not ground the grids directly, but do so t; /archives//html/Amps/1999-04/msg00226.html (8,334 bytes)

Current List: 161 - 180
Page: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12]