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281. [AMPS] 2KD-5 (score: 1): Author: measures@vcnet.com (measures); Date: Tue, 2 Nov 1999 15:31:12 -0700; What is the measured potential across 3-500Z pins 1 and 5 of a U.S. version 2KD-5 when it is being operated from 240v, Dan? Indeed, as per the Jan/1994 QST article. I have thought about this many ti; /archives//html/Amps/1999-11/msg00092.html (7,891 bytes)
282. [AMPS] A look underneath the Ugly amp. chassis. (score: 1): Author: measures@vcnet.com (measures); Date: Wed, 3 Nov 1999 08:59:50 -0700; I added a chassis view of the Ugly amp. to my Web site. Warning. This is a high-res JPEG file, so it takes a while to download. However, you can pretty much see what's what. The grid roller coil [fro; /archives//html/Amps/1999-11/msg00108.html (9,563 bytes)
283. [AMPS] tetrode as triode (score: 1): Author: measures@vcnet.com (measures); Date: Wed, 3 Nov 1999 09:27:42 -0700; A screen supply for the 4cx1500B consists of a string of 5w 20v zeners with a high value resistor going to the B+. This is essentially the same circuit that Eimac recommended in its SSB book in the; /archives//html/Amps/1999-11/msg00112.html (7,856 bytes)
284. [AMPS] En: HELP (score: 1): Author: measures@vcnet.com (measures); Date: Wed, 3 Nov 1999 09:27:44 -0700; I would use 105-degree C, 450v c. 330uF caps, and add 1 cap to the string to make the total rated volts similar. 500v rated electrolytics tend to be problematic. cheerw, SERGIO - Rich..., 805.386.37; /archives//html/Amps/1999-11/msg00113.html (7,324 bytes)
285. [AMPS] A look underneath the Ugly amp. chassis. (score: 1): Author: measures@vcnet.com (measures); Date: Wed, 3 Nov 1999 09:43:47 -0700; 2A @ 7kV. VHF suppression was discussed in a previous post. cheers - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting; /archives//html/Amps/1999-11/msg00114.html (8,752 bytes)
286. [AMPS] "ugly amp" (score: 1): Author: measures@vcnet.com (measures); Date: Wed, 3 Nov 1999 09:43:50 -0700; The eight incher for the tube socket was made by drawing a circle with a compass and following the line with a coping saw. The blade was a fine tooth metal-cutting blade. Other holes were either saw; /archives//html/Amps/1999-11/msg00115.html (7,109 bytes)
287. [AMPS] A look underneath the Ugly amp. chassis. (score: 1): Author: measures@vcnet.com (measures); Date: Wed, 3 Nov 1999 15:45:40 -0700; ? Hang onto your hat. The nichrome resistance wire that the rheostat was made from was subject to disintegration from atmospheric effects. The graphite contact in the movable arm would crumble. The; /archives//html/Amps/1999-11/msg00120.html (10,130 bytes)
288. [AMPS] Re: "ugly amp" (score: 1): Author: measures@vcnet.com (measures); Date: Wed, 3 Nov 1999 17:00:02 -0700; The eight incher for the tube socket was made by drawing a circle with a compass and cutting along the line with a coping saw. The coping saw blade was fine tooth for sheet metal cutting. Other hole; /archives//html/Amps/1999-11/msg00122.html (6,954 bytes)
289. [AMPS] A look underneath the Ugly amp. chassis. (score: 1): Author: measures@vcnet.com (measures); Date: Wed, 3 Nov 1999 21:18:05 -0700; A rheostat in the HV transformer primary is bananas. poor. I disagree. You gotta short the cap with wide Cu foil and measure the resonance with a dipmeter.. cheers, Jon - Rich..., 805.386.3734, www.; /archives//html/Amps/1999-11/msg00127.html (11,104 bytes)
290. [AMPS] A look underneath the Ugly amp. chassis. (score: 1): Author: measures@vcnet.com (measures); Date: Wed, 3 Nov 1999 22:29:10 -0700; No. The current is not semi-constant. . ? Never, ever. All the rheostat can do is create unregulation. ? And when the anode current changes, what then? - Rich..., 805.386.3734, www.vcnet.com/measure; /archives//html/Amps/1999-11/msg00129.html (9,265 bytes)
291. [AMPS] Capacitors & Resonance (score: 1): Author: measures@vcnet.com (measures); Date: Thu, 4 Nov 1999 05:00:09 -0700; A capacitor that is resonant at 50MHz looks like an inductance at 150MHz. A better bypass for 150MHz might be 200 pF. cheers. - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://w; /archives//html/Amps/1999-11/msg00140.html (8,156 bytes)
292. [AMPS] A look underneath the Ugly amp. chassis. (score: 1): Author: measures@vcnet.com (measures); Date: Thu, 4 Nov 1999 05:00:12 -0700; Yes. The rheostat is a 50w unit. It is in the primary of the filament transformer. - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions:; /archives//html/Amps/1999-11/msg00141.html (10,854 bytes)
293. [AMPS] Capacitors & Resonance (score: 1): Author: measures@vcnet.com (measures); Date: Thu, 4 Nov 1999 09:06:51 -0700; I built a 1kW 2m tetrode SSB amplifier. I did not use a 1000pF anode supply bypass. The amplifier seemingly worked ok. cheers - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://w; /archives//html/Amps/1999-11/msg00150.html (7,365 bytes)
294. [AMPS] HV choke (score: 1): Author: measures@vcnet.com (measures); Date: Thu, 4 Nov 1999 12:59:07 -0700; ....in the Ugly amp., the large choke's resonance is parked on 15MHz WWV. Winding your own chokes saves big bucks. - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contesti; /archives//html/Amps/1999-11/msg00154.html (8,528 bytes)
295. [AMPS] AL1500 (score: 1): Author: measures@vcnet.com (measures); Date: Thu, 4 Nov 1999 13:58:37 -0700; I would check the valve for gold sputtering, Clive. To do this you need a high-pot. tester. The grid is common. The anode is hot. Apply pos. 8kV. If the leakage is above 10mA you may have a problem.; /archives//html/Amps/1999-11/msg00156.html (7,748 bytes)
296. [AMPS] HV choke (score: 1): Author: measures@vcnet.com (measures); Date: Thu, 4 Nov 1999 18:47:57 -0700; The three chokes you see in the Top View of the Ugly amplifier were made by yours truly. http://www.vcnet.com/measures/PBox.top.inside.jpeg The cost was about $1.15 per inch. - Rich..., 805.386.3734; /archives//html/Amps/1999-11/msg00163.html (7,778 bytes)
297. [AMPS] Ugly amps. update (score: 1): Author: measures@vcnet.com (measures); Date: Thu, 4 Nov 1999 18:47:58 -0700; An explanation of what you see in the photos is now provided. cheers - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contestin; /archives//html/Amps/1999-11/msg00164.html (6,565 bytes)
298. [AMPS] Copy-editor needed. (score: 1): Author: measures@vcnet.com (measures); Date: Sat, 6 Nov 1999 09:44:18 -0700; The c. 1500-word manuscript on constructing Ugly amplifiers is complete. If someone has the time and inclination to critique it, I would greatly appreciate it. . thanks - Rich..., 805.386.3734, www.v; /archives//html/Amps/1999-11/msg00195.html (6,703 bytes)
299. [AMPS] E. F Johnson type 222. (score: 1): Author: measures@vcnet.com (measures); Date: Sun, 7 Nov 1999 10:09:20 -0700; I need a catalog photograph of an E. F Johnson type-222, 15A-rated rotary inductor. thanks - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submi; /archives//html/Amps/1999-11/msg00197.html (6,626 bytes)
300. [AMPS] 2KD-5 (score: 1): Author: measures@vcnet.com (measures); Date: Sun, 7 Nov 1999 15:53:08 -0700; The only thing that is seemingly more dangerous is rugby and lacrosse. If you love and respect Henry Radio, my advice is do Not under any circumstances go there. However, if you are a curious guy, a; /archives//html/Amps/1999-11/msg00200.html (10,141 bytes)

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