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21. Re: [Amps] Miller-Larson effect on thoriated tungsten filaments (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Tue, 25 Jun 2013 01:03:50 -0500
Thanks, Leigh. If nothing else, those books emphasize the importance of a soft-start circuit. Evidently, it's the *change* in temperature that affects the life. If holding the temp constant at those
/archives//html/Amps/2013-06/msg00242.html (9,425 bytes)

22. Re: [Amps] Electron HOLE flow (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Wed, 28 Aug 2013 13:05:13 -0500
Absolutely it is an illusion. IIRC, that was erroneously introduced into textbooks around 1970 the same time as the "electricity flows from positive to negative" nonsense. Whoever came up with the la
/archives//html/Amps/2013-08/msg00159.html (8,416 bytes)

23. Re: [Amps] Electron HOLE flow (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Sat, 31 Aug 2013 18:17:08 -0500
I appreciate all the replies to my comment about the direction of current flow (which I have ALWAYS thought of as the direction that electrons flow). My comments below. Ben Franklin had a 50-50 chanc
/archives//html/Amps/2013-08/msg00194.html (14,455 bytes)

24. Re: [Amps] Hole Flow (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Sat, 31 Aug 2013 18:52:51 -0500
I have never heard it explained any other way! At least not until this thread. I agree with W6WRT. Heated objects --like cathode filaments-- emit electrons. I have always understood that the flow of
/archives//html/Amps/2013-08/msg00195.html (8,367 bytes)

25. Re: [Amps] Hole Flow (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Sat, 31 Aug 2013 22:30:31 -0500
Hi Jim, Indeed. For a long time, I thought it was *always* ground-to-cloud. But that's apparently not the case. http://images.intellicast.com/WxImages/Lightning/usa.jpg shows yellow as negative strik
/archives//html/Amps/2013-08/msg00202.html (9,849 bytes)

26. [Amps] Power output drop (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Tue, 10 Sep 2013 20:03:43 -0500
` Anyone have an idea why the power output of my dual parallel 833C 160m amp often drops 200+ watts after several seconds? Re-tuning does not bring it back up to the initial output. Not that a drop f
/archives//html/Amps/2013-09/msg00019.html (7,493 bytes)

27. Re: [Amps] Power output drop (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Tue, 10 Sep 2013 20:35:17 -0500
Thanks, Vic. Someone else (in a private e-mail) just suggested line voltage. I do monitor the filament voltage, but I should monitor the 240 VAC and look at the HV meter, too. There is a "too-long" r
/archives//html/Amps/2013-09/msg00022.html (9,110 bytes)

28. Re: [Amps] Power output drop (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Wed, 11 Sep 2013 16:14:52 -0500
Hello Carl, Thank you, and you are right about the photos! I'm really sorry about that. I should delete the old photos before I answer anything else. The plate choke (From a Gates 1 kW AM BCB transmi
/archives//html/Amps/2013-09/msg00049.html (9,229 bytes)

29. Re: [Amps] 160M PI network Toroidal Coil (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Sat, 5 Oct 2013 13:10:21 -0500
When I converted my SB-200 to a single-band 160m amp, I followed the directions (more or less) at http://pa0fri.home.xs4all.nl/Lineairs/SB200/sb200eng.htm#DESIGN . The toroid was a single T-200-2 cor
/archives//html/Amps/2013-10/msg00055.html (8,919 bytes)

30. Re: [Amps] Making a broadband transformer (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Tue, 5 Nov 2013 09:08:07 -0600
Bill, I know very little about what it takes to build a solid-state amp, but I have an experience to share that may be of help to you. I have a broadband matching transformer on the input of my swamp
/archives//html/Amps/2013-11/msg00050.html (11,776 bytes)

31. Re: [Amps] Making a broadband transformer (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Tue, 5 Nov 2013 14:43:33 -0600
That's generally true, Bill. But according to Fair-rite, the multi-aperture feature increases the bandwidth vs. a single hole. Whether or not 73 material is suitable, another material molded into a b
/archives//html/Amps/2013-11/msg00057.html (7,865 bytes)

32. Re: [Amps] Discrepencies in Pi-net calculators (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Wed, 20 Nov 2013 11:20:49 -0600
To add to the confusication here, here's the pi-calc I use here: http://www.ifwtech.co.uk/g3sek/pi-l-net.zip I thought G3SEK's spreadsheet above was pretty good. I know VK1OD's is also good, but I fo
/archives//html/Amps/2013-11/msg00392.html (9,845 bytes)

33. Re: [Amps] Building an Amp 101 (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Fri, 17 Jan 2014 11:51:20 -0600
Are we looking at the same amp? It looks like my output loading cap in my legal-limit amp, and it's never arced even into a high SWR. The output loading capacitor only has to handle about 300 volts.
/archives//html/Amps/2014-01/msg00106.html (9,218 bytes)

34. [Amps] SB-200 idling current and plate color (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Mon, 31 Mar 2014 20:51:57 -0500
My SB-200 draws 90 mA of idling plate current, and both 572B plates show a red color with no drive. Is this red color OK, or should I increase the grid bias? (I think I should have increased it when
/archives//html/Amps/2014-03/msg00207.html (6,809 bytes)

35. Re: [Amps] SB-200 input (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Fri, 25 Jul 2014 12:12:45 -0500
Carl, do you mean this web site: http://pa0fri.home.xs4all.nl/Lineairs/SB200/sb200eng.htm A few years ago, I actually did some mods based on that. Not all of them, but I did do one or two changes to
/archives//html/Amps/2014-07/msg00113.html (7,259 bytes)

36. Re: [Amps] 572B - News? (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Sat, 8 Nov 2014 03:11:51 -0600
The GI7-BT mod is the way to go in the absence of good 572Bs. But the thought occurred to me that it might be a lot of fun to replace the 572Bs in my SB-200 with a pair of 813s. It looks like they mi
/archives//html/Amps/2014-11/msg00018.html (7,859 bytes)

37. Re: [Amps] 833A GG (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Mon, 26 Jan 2015 03:01:20 -0600
Not recommended for GG on ANY band.. Not enough gain, for one thing; it would take several hundred watts of drive power to obtain the legal limit. Another issue is that the feedback capacitance is qu
/archives//html/Amps/2015-01/msg00292.html (8,317 bytes)

38. Re: [Amps] 833A GG (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Mon, 26 Jan 2015 10:58:18 -0600
Yup, that's the main problem, Bill. Well, a single 833A won't do the legal limit without pushing the envelope. And the trouble with P-P is that the old parallel-tuned link coupled output circuit does
/archives//html/Amps/2015-01/msg00302.html (8,498 bytes)

39. Re: [Amps] 833A GG (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Mon, 26 Jan 2015 13:47:30 -0600
Hi Bill, I'm sorry, I didn't state that question correctly. I'm fully aware that Gates used two in parallel, but that was on the AM BCB. Those 833Cs and a few other components in my amp came from one
/archives//html/Amps/2015-01/msg00305.html (8,141 bytes)

40. Re: [Amps] 833A GG (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Mon, 26 Jan 2015 16:47:11 -0600
Anybody know where I can get a neutralizing capacitor for two paralleled 833Cs? What I had in mind is in the second photo from the top at www.criticalradio.com/833%20Rig%20Project/Web%20Pages/RF%20De
/archives//html/Amps/2015-01/msg00312.html (8,416 bytes)

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