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41. Re: [Amps] grounding grids (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Thu, 30 Jul 2009 15:55:06 -0400; Ive stayed out of this until now and have been enjoying many of the replies. The best are from those who never got past reading books or drivel from some web site and wouldnt know which end of a SA i; /archives//html/Amps/2009-07/msg00412.html (13,337 bytes)
42. Re: [Amps] grounding grids (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Thu, 30 Jul 2009 13:54:11 -0700; ORIGINAL MESSAGE: REPLY: I guess we will have to agree to disagree. In my view, doing what you state above does reduce gain, increases input impedance and may he highly desirable is several respects,; /archives//html/Amps/2009-07/msg00413.html (9,639 bytes)
43. Re: [Amps] grounding grids (score: 1): Author: "Ward Silver" <hwardsil@gmail.com>; Date: Thu, 30 Jul 2009 15:48:11 -0700; What?! And ruin a perfectly good thread? 73, Ward N0AX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2009-07/msg00414.html (8,044 bytes)
44. Re: [Amps] grounding grids (score: 1): Author: Jack Shirley <jcshirle@gmail.com>; Date: Thu, 30 Jul 2009 19:25:08 -0400; I looked at the various 3-400 and 3-500 circuits in the Eimac Amateur Service Newsletters and did not find this mentioned anywhere. If the SB-220 and L4 use the same grid circuit, I could ask the eng; /archives//html/Amps/2009-07/msg00415.html (8,873 bytes)
45. Re: [Amps] grounding grids (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Thu, 30 Jul 2009 20:51:33 -0400; Yes Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2009-07/msg00418.html (9,436 bytes)
46. Re: [Amps] grounding grids (score: 1): Author: "Phil Clements" <philc@texascellnet.com>; Date: Thu, 30 Jul 2009 20:14:24 -0500; Inquiring minds want to know, Jack! I think we are about to cloud the issue with real facts; can we handle the truth? (((73))) Phil, K5PC _______________________________________________ Amps mailing; /archives//html/Amps/2009-07/msg00419.html (8,389 bytes)
47. Re: [Amps] grounding grids (score: 1): Author: Thomas Carlsson <thomascarl@gmail.com>; Date: Thu, 30 Jul 2009 23:00:16 -0300; Interesting addition: LK-500 and its brothers have Grids direct to Ground, no components.Cathode resistor only 0.15ohm/3W. SB220 and L4(B) both 1ohm in cathode and they have the same grid components,; /archives//html/Amps/2009-07/msg00420.html (9,990 bytes)
48. Re: [Amps] grounding grids (score: 1): Author: "Jeff Blaine AC0C" <keepwalking188@yahoo.com>; Date: Thu, 30 Jul 2009 21:11:09 -0500; Great idea Jack. 73/jeff/ac0c _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2009-07/msg00421.html (9,573 bytes)
49. Re: [Amps] grounding grids (score: 1): Author: Jack Shirley <jcshirle@gmail.com>; Date: Thu, 30 Jul 2009 22:59:36 -0400; The answer is: to provide -2db negative feedback. This was done to match the output power of the TR-3 and TR-4. Also of note; it was the first 3-400/500 amp to have tuned input circuits, The output c; /archives//html/Amps/2009-07/msg00422.html (11,410 bytes)
50. Re: [Amps] grounding grids (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Fri, 31 Jul 2009 01:50:41 -0400; At what frequency since the impedance between the grid and common (ground) changes by a factor of nearly 10:1 between 3.5 MHz and 29.7 MHz? What other steps were taken to hold the -2dB feedback cons; /archives//html/Amps/2009-07/msg00427.html (12,975 bytes)
51. Re: [Amps] grounding grids (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Fri, 31 Jul 2009 02:05:11 -0400; This would also indicate a value to removing the negative feedback circuit with modern 100 Watt output solid state transceivers. With their three finals, the TR-3 and TR-4 were capable of 150+ watts; /archives//html/Amps/2009-07/msg00428.html (12,931 bytes)
52. Re: [Amps] grounding grids (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Fri, 31 Jul 2009 09:38:05 -0400; Not necessarily. Altho the average rice box has far worse IMD than say a SB-220 it is far less tolerant of reflections from the amp which further aggravate the IMD. A pair of 3-500Z's can easily hand; /archives//html/Amps/2009-07/msg00433.html (14,213 bytes)
53. Re: [Amps] grounding grids (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Fri, 31 Jul 2009 20:54:29 -0500; Joe, What makes you think that the impedance between the grid and common changes by a factor of 10:1 between 3.5 and 29.7 MHz? 73 Gary K4FMX _______________________________________________ Amps maili; /archives//html/Amps/2009-07/msg00458.html (14,764 bytes)
54. [Amps] grounding grids (score: 1): Author: Herzog <herzog@frontiernet.net>; Date: Sat, 01 Aug 2009 18:44:42 -0400; RE: What makes you think that the impedance between the grid and common changes by a factor of 10:1 between 3.5 and 29.7 MHz? 73 Gary K4FMX == That is a red herring. Because the frequency ratio is ab; /archives//html/Amps/2009-08/msg00011.html (6,958 bytes)
55. Re: [Amps] grounding grids (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Sun, 2 Aug 2009 00:24:21 -0400; The question we should ask now what are our preferences in grounding grids. Mine is as direct to ground as possible with the least series impedance. 73 Bill wa4lav PS Has the gentleman trying out the; /archives//html/Amps/2009-08/msg00019.html (8,223 bytes)
56. Re: [Amps] grounding grids (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Sat, 01 Aug 2009 21:49:17 -0700; ORIGINAL MESSAGE: REPLY: I agree. If series or parallel impedance is needed in the input network, it generally should be added in the cathode. There may be some obscure reason to put it in the grid c; /archives//html/Amps/2009-08/msg00020.html (7,450 bytes)
57. Re: [Amps] grounding grids (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sun, 2 Aug 2009 10:38:41 -0400; Mine is to leave things alone after performing the PM and other improvements I mentioned earlier. I get a kick out of a small minority always thinking they are better than the design engineers. Yet w; /archives//html/Amps/2009-08/msg00023.html (9,677 bytes)
58. Re: [Amps] grounding grids (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Sun, 2 Aug 2009 12:13:05 -0400; It is very helpful to question what has been done in the past so we can learn from it. Making real measurements helps also. I did not see the details of your experiment but comparison with directly g; /archives//html/Amps/2009-08/msg00024.html (10,548 bytes)
59. Re: [Amps] grounding grids (score: 1): Author: Robert Morris <robrk@nidhog.net>; Date: Sun, 02 Aug 2009 14:35:21 -0400; Change your server account setting from POP to IMAP. Mail not deleted will be there, when you get home. -- This message has been scanned for viruses and dangerous content by MailScanner, and is belie; /archives//html/Amps/2009-08/msg00025.html (7,518 bytes)
60. Re: [Amps] grounding grids (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sun, 2 Aug 2009 16:37:35 -0400; I was taking IMD and other measurements long before the Internet got popular. Ive also made the results available enough times on amplifier forums the past 15 or so years that I would have thought it; /archives//html/Amps/2009-08/msg00026.html (12,242 bytes)

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