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Total 20 documents matching your query.

1. [Amps] L-PI amp network (score: 1): Author: Steve Bookout <steve@nr4m.com>; Date: Tue, 13 Dec 2022 17:36:44 -0500; Hello all, (First part is background, so you know a more 'overall' of what I'm doing.) I've been intending to finish a long-ago-started mono band amp for 10 meters, and I think I regained the enthusi; /archives//html/Amps/2022-12/msg00044.html (9,130 bytes)
2. Re: [Amps] L-PI amp network (score: 1): Author: Jim W7RY <jimw7ry@gmail.com>; Date: Tue, 13 Dec 2022 17:01:30 -0600; What plate voltage are you going to have on the tube of choice Steve? Jim W7RY (First part is background, so you know a more 'overall' of what I'm doing.) I've been intending to finish a long-ago-sta; /archives//html/Amps/2022-12/msg00045.html (10,625 bytes)
3. Re: [Amps] L-PI amp network (score: 1): Author: Steve Bookout <steve@nr4m.com>; Date: Tue, 13 Dec 2022 18:23:09 -0500; Hello Jim, 4kv. It's about 4.2 kv, no load. On another point, for the group, 'somewhere, sometime', in more than one place on the web, I've seen where people recommended using 2.0 as the 'K' factor,; /archives//html/Amps/2022-12/msg00046.html (10,785 bytes)
4. Re: [Amps] L-PI amp network (score: 1): Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>; Date: Wed, 14 Dec 2022 03:24:29 +0200; _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2022-12/msg00048.html (7,099 bytes)
5. Re: [Amps] L-PI amp network (score: 1): Author: Victor Rosenthal <k2vco.vic@gmail.com>; Date: Wed, 14 Dec 2022 03:26:40 +0200; I faced this problem when building a 4CX1000A amplifier. The GM3SEK calculator gives you a value, but the stray plate-to-ground capacitance is an important variable and it is hard to determine. I mea; /archives//html/Amps/2022-12/msg00049.html (17,346 bytes)
6. Re: [Amps] L-PI amp network (score: 1): Author: Steve Bookout <steve@nr4m.com>; Date: Tue, 13 Dec 2022 21:07:04 -0500; Hi Vic, The GM3SEK calculator gives you a value, but the stray plate-to-ground capacitance is an important variable and it is hard to determine. I measured it (with an AADE LC meter) with the tuning; /archives//html/Amps/2022-12/msg00052.html (19,896 bytes)
7. Re: [Amps] L-PI amp network (score: 1): Author: Jim W7RY <jimw7ry@gmail.com>; Date: Tue, 13 Dec 2022 20:29:29 -0600; Steve.. So... the minimum capacitance of the tune cap is a problem on 10 meters.... I would use about a 100 pF cap MAX for the tune cap (vacuum cap is absolutely not needed). Then L1 is 2.3 uH (most; /archives//html/Amps/2022-12/msg00053.html (14,339 bytes)
8. Re: [Amps] L-PI amp network (score: 1): Author: Steve Bookout <steve@nr4m.com>; Date: Tue, 13 Dec 2022 21:38:04 -0500; Thank Jim, One of my big questions was if I could use GM3SEK's spreadsheet calculator. I'm not too far off from what you came up with and that was because we used different numbers here and there. I; /archives//html/Amps/2022-12/msg00054.html (13,384 bytes)
9. Re: [Amps] L-PI amp network (score: 1): Author: Jeff Blaine <KeepWalking188@ac0c.com>; Date: Tue, 13 Dec 2022 23:33:50 -0600; I bet you won't need much series L. The Cout in GG of the 8877 is only 10pf. 73/jeff/ac0c alpha-charlie-zero-charlie www.ac0c.com One of my big questions was if I could use GM3SEK's spreadsheet calc; /archives//html/Amps/2022-12/msg00057.html (14,167 bytes)
10. Re: [Amps] L-PI amp network (score: 1): Author: "Peter Voelpel" <dj7ww@t-online.de>; Date: Wed, 14 Dec 2022 09:21:26 +0100; A K of 2 applies only when the tubes are biased for class C. Typically they are run in class B (K=1.8). I use such tubes as well, RS1002A or QB4/1100. 73 Peter, DJ7WW Hello Jim, 4kv. It's about 4.2; /archives//html/Amps/2022-12/msg00059.html (12,884 bytes)
11. [Amps] L-PI amp network (score: 1): Author: "jim.thom jim.thom@telus.net" <jim.thom@telus.net>; Date: Sat, 17 Dec 2022 09:55:28 -0800; I cycled all of the unknown tubes thru this amp.? They all were similar, taking 22 to 27 watts of drive for the same 1500 watts out;? 550 ma to 600ma @.030 ma grid. That was the background for my rea; /archives//html/Amps/2022-12/msg00072.html (11,876 bytes)
12. Re: [Amps] L-PI amp network (score: 1): Author: Steve Bookout <steve@nr4m.com>; Date: Sat, 17 Dec 2022 17:15:35 -0500; Jim, Thanks a bunch for your input. I was close. I had used .65 for the current and a "K" factor of 2.0 as I'm 99% CW. It's been DECADES since I was above 28.1 MHz. I could have easily chosen 1.8.; /archives//html/Amps/2022-12/msg00075.html (14,439 bytes)
13. Re: [Amps] L-PI amp network (score: 1): Author: Steve Bookout <steve@nr4m.com>; Date: Sat, 17 Dec 2022 17:18:43 -0500; ...And, I was planning on using about a 1 7/8 - 2 inch dia for the coil. Steve I cycled all of the unknown tubes thru this amp.? They all were similar, taking 22 to 27 watts of drive for the same 150; /archives//html/Amps/2022-12/msg00076.html (12,400 bytes)
14. Re: [Amps] L-PI amp network (score: 1): Author: Jeff Blaine <KeepWalking188@ac0c.com>; Date: Sun, 18 Dec 2022 13:48:31 -0600; Steve, I realize some guys may be able to get the physical build to match these calculations and have it be dead on. But in my limited experience, there is still a lot of manual tweaking that may be; /archives//html/Amps/2022-12/msg00077.html (14,967 bytes)
15. Re: [Amps] L-PI amp network (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Sun, 18 Dec 2022 11:59:49 -0800; I'm not an amp builder, but my EE classes included load lines for tubes so that we could compute their dynamic output resistance, so this advice seems spot on to me. Our class of '64 was the last to; /archives//html/Amps/2022-12/msg00078.html (9,206 bytes)
16. Re: [Amps] L-PI amp network (score: 1): Author: Jim W7RY <jimw7ry@gmail.com>; Date: Sun, 18 Dec 2022 14:14:35 -0600; Yup! Or make the coil a bit longer than needed, then when done tweaking... Make a "completed" one once all the fine tuning is done. 73, Jim W7RY I'm not an amp builder, but my EE classes included loa; /archives//html/Amps/2022-12/msg00079.html (9,565 bytes)
17. Re: [Amps] L-PI amp network (score: 1): Author: Steve Bookout <steve@nr4m.com>; Date: Sun, 18 Dec 2022 17:10:38 -0500; Jeff, and others, Not a problem. I already have an idea to make the connections of the coil, snug, but still moveable. I plan on making my 'best guess' and then have enough slack in the mounting; /archives//html/Amps/2022-12/msg00080.html (16,733 bytes)
18. Re: [Amps] L-PI amp network (score: 1): Author: "jim.thom jim.thom@telus.net" <jim.thom@telus.net>; Date: Mon, 19 Dec 2022 05:16:19 -0800; <Jim, <Thanks a bunch for your input. <I was close. <I had used .65 for the current and a "K" factor of 2.0 as I'm 99% CW.? <It's been DECADES since I was above 28.1 MHz.? I could have easily <chosen; /archives//html/Amps/2022-12/msg00082.html (18,928 bytes)
19. Re: [Amps] L-PI amp network (score: 1): Author: Jim Kinney <jimkinney@bellsouth.net>; Date: Mon, 19 Dec 2022 09:50:23 -0500; Great info Jim, I've been confused on the spreadsheet myself trying to convert an SB-220 to 6m. What LCR meter do you recommend? I don't have a good one. Thanks & 73, Jim WE4S Get BlueMail for Andro; /archives//html/Amps/2022-12/msg00083.html (22,676 bytes)
20. Re: [Amps] L-PI amp network (score: 1): Author: Steve Bookout <steve@nr4m.com>; Date: Tue, 20 Dec 2022 17:25:13 -0500; Hello Jim, Wow! What a treasure trove of good info! Thank you for sharing it with me. I appreciate the detail in which you EXPLAIN things. Although answers may be enough, I really want to know 'why'; /archives//html/Amps/2022-12/msg00090.html (20,416 bytes)

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