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21. Switching PS, was [AMPS] Transformer ++ (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Mon, 26 Mar 2001 23:10:07 -0500; Lets get a bit more specific about buck type switching power supply design. For an interesting web page, see http://www.smpstech.com/tutorial/t02top.htm#BUCK Figure 2-8 shows the basic circuit. The v; /archives//html/Amps/2001-03/msg00275.html (10,124 bytes)
22. [AMPS] HV Cable (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Fri, 5 Jan 2001 23:20:07 -0500; What does the group recommend for running between a Power Supply box and the PA itself. HV wire without a ground around it seems risky. jeff 'springy'. http://www.belden.com/products/Catalog/allList5; /archives//html/Amps/2001-01/msg00190.html (8,648 bytes)
23. [AMPS] DC Filaments??? (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Wed, 1 Nov 2000 02:09:58 -0500; Then why to tubes have a finite service life? Maybe because the filament gets poisoned by gases...then DC or AC won't matter. Maybe because sustained emission degrades emission...then DC will make a; /archives//html/Amps/2000-11/msg00002.html (9,529 bytes)
24. [AMPS] DC Filaments??? (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Wed, 1 Nov 2000 20:48:21 -0500; Even with AC on the filament, the voltage between grid and filament varies along the length of the filament at any instant in time. The filament voltage varies very slowly compared to both the RF car; /archives//html/Amps/2000-11/msg00012.html (8,961 bytes)
25. [AMPS] DC Filaments??? (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Wed, 1 Nov 2000 21:33:12 -0500; is I though you liked AC on the filaments and saw problems with DC? RF amps with AC filaments don't seem to have hum problems from AC filaments. What did I miss, here? I tried to make the point that; /archives//html/Amps/2000-11/msg00015.html (10,354 bytes)
26. [AMPS] DC Filaments??? (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Tue, 31 Oct 2000 23:52:25 -0500; A DC filament has a varying grid to filament voltage along its length and so has uneven cathode to plate current along its length. Thus in theory, one end runs out of emission life faster than the ot; /archives//html/Amps/2000-10/msg00002.html (7,527 bytes)
27. [AMPS] Photograph of autopsied 8877 from AL-1500 amplifier. (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Mon, 2 Oct 2000 04:33:27 -0400; I'm looking but don't understand, yet. I see uniform looking specks to the lower right of the tube, a few specks scattered and similar specks around the cut edge. Where do I look to see the large vs; /archives//html/Amps/2000-10/msg00011.html (8,448 bytes)
28. [AMPS] amp project: 4-400s X 4 (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Sun, 8 Oct 2000 04:17:10 -0400; Here's an idea for a cheap screen supply. Start with the plate supply from a very old Motorola or GE VHF/UHF base station. They usually generate about 600V, 200W CCS. Pull out the 5R4's and replace w; /archives//html/Amps/2000-10/msg00121.html (9,189 bytes)
29. Fw: [AMPS] 3CX1200 (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Mon, 9 Oct 2000 23:51:37 -0400; I had the same problem with my souped up DX-100. I found some CBS labs Volumax units, put one in line and problem solved. It seems that some sort of audio peak limiting would allow you to keep using; /archives//html/Amps/2000-10/msg00158.html (8,843 bytes)
30. [AMPS] Series Tuned Tank? (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Fri, 13 Oct 2000 01:10:33 -0400; My guess: Design the plate output circuit to resonate with a bit less than the rated output cap of the plate plus strays. Then put a series capacitor in the plate to tank coil lead to reduce the effe; /archives//html/Amps/2000-10/msg00263.html (11,175 bytes)
31. [AMPS] Series Tuned Tank? (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Sat, 14 Oct 2000 03:44:02 -0400; Tom suggests that reducing capacitance and increasing inductance with the series cap suggested actually increases Q. At great risk to my lap dog status, I decided to model the two circuits and compar; /archives//html/Amps/2000-10/msg00293.html (9,533 bytes)
32. [AMPS] a sticky issue. (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Sun, 15 Oct 2000 23:47:33 -0400; Someone is certainly confused here. The HF RF bypass cap will reduce 1.8 MHz ripple on the electrolytics. The problem with ripple currents in the electrolytics has to due with resistive heating, The; /archives//html/Amps/2000-10/msg00345.html (10,523 bytes)
33. [AMPS] Series Tuned Tank? (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Tue, 17 Oct 2000 01:20:01 -0400; I was able to confirm that a series cap increases Q and several people helped me to understand intuitively what it works that way. When I model a series L, the results also show an increase in Q, by; /archives//html/Amps/2000-10/msg00416.html (9,242 bytes)
34. [AMPS] need some resistors] (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Wed, 18 Oct 2000 00:26:09 -0400; What's wrong with a chunk of wire? 150 ft of #12 100 ft of #14 60 ft of #16 25 ft of #18 have! -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative reques; /archives//html/Amps/2000-10/msg00451.html (7,876 bytes)
35. [AMPS] need some resistors] (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Wed, 18 Oct 2000 00:35:50 -0400; 25 ft of #18 can be compact. If it get too compact you might need a blower. PVC might melt. How about a ceramic form of some type? watt 400 -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissio; /archives//html/Amps/2000-10/msg00453.html (9,083 bytes)
36. [AMPS] Series Tuned Tank? (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Fri, 20 Oct 2000 03:26:34 -0400; The results of modeling with a serial inductance from plate to PiNet are in...sorta. I still couldn't find a combination that lowers the Q. Here's a table of results. The following table is for a sin; /archives//html/Amps/2000-10/msg00480.html (9,792 bytes)
37. [AMPS] Nichrome wire resistance? (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Fri, 20 Oct 2000 03:47:16 -0400; I think the ribbon corresponds to a 21 gauge wire because .126 x .005 yeilds .00063 sq in, corresponding to 28.3 mils diameter...same as 21 gauge. So, according to the table at http://www.wiretron.co; /archives//html/Amps/2000-10/msg00481.html (8,944 bytes)
38. [AMPS] (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Fri, 27 Oct 2000 00:08:43 -0400; I keep forgetting to hit reply all big less. grid input. With a tube type exciter the output tank of the exciter stage has enough Q to prevent problems with uneven load. The tube in the driver will s; /archives//html/Amps/2000-10/msg00593.html (7,478 bytes)
39. [AMPS] Portable linear using a DAF? (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Sun, 29 Oct 2000 14:52:28 -0500; comments included below Key design problems include - transformer resonates below switching frequency due to high capacitance in large number of turns required - slow switching speed of high voltage; /archives//html/Amps/2000-10/msg00651.html (12,788 bytes)
40. [AMPS] Portable linear using a DAF? (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Sun, 29 Oct 2000 16:28:52 -0500; get your Oops...need better proof reading skills. At 450V, that's 1.0A and about 6 tubes in parallel for 450W. Or with a bit more agressive power supply, 600V, 10 tubes in parallel, for 900W out. exp; /archives//html/Amps/2000-10/msg00654.html (14,864 bytes)

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