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21. Re: [Amps] Odd efficiency shift on 80m band (score: 1): Author: Jeff Blaine <keepwalking188@yahoo.com>; Date: Wed, 11 Mar 2009 21:25:46 -0500; Hi Larry, And thanks for your comments. The load cap is an 850 pf unit and I would agree with your 500 pf assessment, the control is about 2:00 on the 4.0M and around 10:00 on the 3.5 so that matches; /archives//html/Amps/2009-03/msg00331.html (11,219 bytes)
22. [Amps] What is the true and actual meaning of a plate dissipation limit? (score: 1): Author: Jeff Blaine <keepwalking188@yahoo.com>; Date: Wed, 11 Mar 2009 21:51:34 -0500; Gentlemen, Wanted: an understanding of the actual and true meaning of the plate disipation limits with respect to duty cycle. I may have missed it, but it seems the answer is hiding at least from me.; /archives//html/Amps/2009-03/msg00333.html (9,052 bytes)
23. Re: [Amps] microwave transformers (score: 1): Author: Jeff Blaine <keepwalking188@yahoo.com>; Date: Wed, 11 Mar 2009 22:34:54 -0500; RM told me that Panasonic has a new HV switching PS for microwave ovens in production now. And that a couple of those may make a decent light duty B+ source. Not sure if he was joking or not. I do su; /archives//html/Amps/2009-03/msg00335.html (9,942 bytes)
24. Re: [Amps] plate dissipation and duty factor (score: 1): Author: Jeff Blaine <keepwalking188@yahoo.com>; Date: Thu, 12 Mar 2009 02:16:41 -0500; Hi John, Thanks very much for the info. That's a great bit of data there. And it's great to have that confirmation. For the duty cycle, the ARRL if I remember correctly calls out the duty cycles for; /archives//html/Amps/2009-03/msg00340.html (13,693 bytes)
25. Re: [Amps] plate dissipation and duty factor (score: 1): Author: Jeff Blaine <keepwalking188@yahoo.com>; Date: Thu, 12 Mar 2009 12:28:01 -0500; Hi Rex, It varies from 50% at idle to about 90% max, depending on data content. Source KK7UQ: http://kk7uq.com/html/download/IMD%2520Presentation.ppt He's the guy who came up with that nifty IMD mete; /archives//html/Amps/2009-03/msg00348.html (16,533 bytes)
26. Re: [Amps] Odd efficiency shift on 80m band (score: 1): Author: Jeff Blaine <keepwalking188@yahoo.com>; Date: Thu, 12 Mar 2009 14:03:41 -0500; Hi Gary, The grid current is almost the same at each point. Within the variation I would see in each itternation of a tune process. And the efficiency number, that was not discounting the feed-throug; /archives//html/Amps/2009-03/msg00353.html (13,905 bytes)
27. Re: [Amps] plate dissipation and duty factor (score: 1): Author: Jeff Blaine <keepwalking188@yahoo.com>; Date: Thu, 12 Mar 2009 14:15:29 -0500; Gentlemen, I was thinking about this anode disipation capability today as well. The ability to pull the heat off the plates is going to be limited by the thermal gradient between the anode face and t; /archives//html/Amps/2009-03/msg00355.html (19,924 bytes)
28. Re: [Amps] 810 Amplifier (score: 1): Author: Jeff Blaine <keepwalking188@yahoo.com>; Date: Thu, 12 Mar 2009 14:21:24 -0500; George, You may want to consider a trio of GI7B (less complicated) or perhaps a 4cx800 (more complicated) if you run something other than SSB. These ceramic tubes are far more durable than the glass; /archives//html/Amps/2009-03/msg00356.html (8,087 bytes)
29. Re: [Amps] 810 Amplifier (score: 1): Author: Jeff Blaine <keepwalking188@yahoo.com>; Date: Thu, 12 Mar 2009 17:20:39 -0500; Carl, Can you send us some of whatever is in the water up there? Because the SB200's in this part of the world are sure in need of that magic elixor. What's the plate dis of a pair of 572b? Something; /archives//html/Amps/2009-03/msg00360.html (11,315 bytes)
30. Re: [Amps] cathode emission prediction (score: 1): Author: Jeff Blaine <keepwalking188@yahoo.com>; Date: Thu, 12 Mar 2009 20:42:22 -0500; Thanks John, Have a nice week break. Unfortunately, for guys that are using the Russian triodes, getting an proper set of curves like what Eimac users enjoy is but only a dream... I will dig out the; /archives//html/Amps/2009-03/msg00365.html (8,635 bytes)
31. Re: [Amps] 810 Amplifier (score: 1): Author: Jeff Blaine <keepwalking188@yahoo.com>; Date: Thu, 12 Mar 2009 20:46:12 -0500; Carl, I need to get a well drilled then. Had one as a kid and that brings back memories. And congratulations on getting the 572b's to sing. On the ones I've seen (stock units), the roll-off in po as; /archives//html/Amps/2009-03/msg00366.html (14,083 bytes)
32. Re: [Amps] 810 Amplifier (score: 1): Author: Jeff Blaine <keepwalking188@yahoo.com>; Date: Thu, 12 Mar 2009 20:57:40 -0500; Bill, I made that claim on this very board (or was it the Heath amps board) a few months back. You cannot imagine the noise I got out of that. But I had similar results as you did. Painting that comp; /archives//html/Amps/2009-03/msg00367.html (16,426 bytes)
33. Re: [Amps] 810 Amplifier (score: 1): Author: Jeff Blaine <keepwalking188@yahoo.com>; Date: Fri, 13 Mar 2009 16:47:42 -0500; Carl, I don't have any experience with the tube at 50mhz. But in my particular case, on 10mhz, the efficiency had dropped down to something like 40%. And that was with a matched input network. Like I; /archives//html/Amps/2009-03/msg00402.html (20,469 bytes)
34. Re: [Amps] winding an HV transformer (score: 1): Author: Jeff Blaine <keepwalking188@yahoo.com>; Date: Wed, 01 Apr 2009 01:22:19 -0500; Tomm, Very interesting information here. I am wondering if any of the commerical tube amps are using this kind of circuit for the plate voltage. Given a decent 2KW TX alone can set easily set a guy b; /archives//html/Amps/2009-03/msg00567.html (12,327 bytes)
35. Re: [Amps] RL Calculations (score: 1): Author: Jeff Blaine <keepwalking188@yahoo.com>; Date: Mon, 27 Apr 2009 19:37:33 +0800; Phil, You hit on a key point here with the Q. I also beleive the high-Q issue is possibly overrated. I realize the theoritical benefit to the higher Q. But the losses associated with high circulating; /archives//html/Amps/2009-04/msg00376.html (9,867 bytes)
36. Re: [Amps] first time questions (score: 1): Author: Jeff Blaine <keepwalking188@yahoo.com>; Date: Sat, 16 May 2009 19:59:50 -0500; Ulf, To make the pi calculations, you should consider using the LOADED plate voltage. Idle plate voltage is not a factor. The difference, however, is not very much. Maybe 10-20%... And on #3, you are; /archives//html/Amps/2009-05/msg00095.html (9,320 bytes)
37. Re: [Amps] first time questions (score: 1): Author: Jeff Blaine <keepwalking188@yahoo.com>; Date: Sat, 16 May 2009 22:25:37 -0500; Carl, Righ you are. Yet here it's hard to know in the case of these tubes. They are pulse rated. So what is the "proper" high voltage? The GI7B range could be argued to run between 1800-9KV. Pretty b; /archives//html/Amps/2009-05/msg00097.html (12,276 bytes)
38. Re: [Amps] AL1200, RTTY contesting, temps, duty cycles (not 100%) (score: 1): Author: "Jeff Blaine AC0C" <keepwalking188@yahoo.com>; Date: Sun, 5 Jul 2009 00:54:02 +0800; Kevin, You are right. RTTY is the big boy challenge for amps. But it tends to make things fall apart in amps in the strangest ways... You had asked some questions about determining temps. I had not s; /archives//html/Amps/2009-07/msg00093.html (15,295 bytes)
39. Re: [Amps] AL1200, RTTY contesting, temps, duty cycles (not 100%) (score: 1): Author: "Jeff Blaine AC0C" <keepwalking188@yahoo.com>; Date: Sun, 5 Jul 2009 09:03:15 +0800; Bill, Assuming the grid current is within specs realtive to the grid disipation limit (which I believe it should be as the 500z need a strong drive), the question is one of plate disipation limits. 2; /archives//html/Amps/2009-07/msg00098.html (20,488 bytes)
40. Re: [Amps] AL1200, RTTY contesting, temps, duty cycles (not 100%) (score: 1): Author: "Jeff Blaine AC0C" <keepwalking188@yahoo.com>; Date: Sun, 5 Jul 2009 11:27:28 +0800; Thanks for the catch, Bill. My point (which I was not clear about) was to outline the relationship between the variables and the plate dissipation. So the guy can do his own calculation. I really don; /archives//html/Amps/2009-07/msg00103.html (12,198 bytes)

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