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41. [AMPS] SB-220 cooling/filaments (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Sun, 07 Oct 2001 01:26:51 -0400; Recently, thinking to help keep my SB-220 cool under contest conditions, I added a small 110v muffin fan pulling air from the top front of the tube compartment -- my thought was to enhance the overal; /archives//html/Amps/2001-10/msg00132.html (7,382 bytes)
42. [AMPS] Deoxit/ProGold (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Sun, 07 Oct 2001 07:40:15 -0400; Elsewhere, people have highly recommended this stuff to improve the conductivity of connector and battery holder contacts which have become oxidized. I'm wondering if anyone has ever used it on filam; /archives//html/Amps/2001-10/msg00138.html (6,955 bytes)
43. [AMPS] Hot SB-220 (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Sun, 07 Oct 2001 21:53:38 -0400; Tuirned out that the solder had melted out of one of the filament pins. I have resoldered it and ordered the high-capacity fan from Harbach/W8CQ. Thanks to Ian, VE7HHS, for his excellent erite-up on; /archives//html/Amps/2001-10/msg00157.html (6,682 bytes)
44. [AMPS] SB-220 cooling (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Mon, 08 Oct 2001 10:39:18 -0400; Well, I resoldered the pin yet again and thoroughly polished the filament pins, and so far the repair seems to be holding. The socket seems to be reasonably tight on the filament pins, so I hope it's; /archives//html/Amps/2001-10/msg00176.html (8,235 bytes)
45. [AMPS] SB-220 cooling -- another thought (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Tue, 09 Oct 2001 17:12:50 -0400; In my SB-220, at least, the springs that clamp the socket contacts on the pins are very readily removable. The design really looks as if the springs were designed to be changed out if and when they b; /archives//html/Amps/2001-10/msg00248.html (7,640 bytes)
46. [AMPS] SB-220 cooling -- another thought (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Wed, 10 Oct 2001 08:33:11 -0400; I think we may be talking about different sockets -- the spring clips I was referring to are about 3/8 inch wide, U-shaped, with tongues (at the top of the U) that are bent in slightly and actually p; /archives//html/Amps/2001-10/msg00261.html (7,937 bytes)
47. [AMPS] Filament resistance and power output (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Wed, 10 Oct 2001 17:15:24 -0400; I resoldered the filament pins on the ailing 3-500Z, and then put it in the opposite socket, thinking that the spring tension might be better there. I also rebent the spring clips on the original soc; /archives//html/Amps/2001-10/msg00271.html (7,837 bytes)
48. [AMPS] SB-220 cooling (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Fri, 12 Oct 2001 06:41:40 -0400; To: <amps@contesting.com> Steve, the SB-220 has an internal cover that already accomplishes what you describe, with an interlock that shorts the HV to ground if it is removed. I probably won't need t; /archives//html/Amps/2001-10/msg00289.html (9,132 bytes)
49. [AMPS] SB-220 cooling (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Fri, 12 Oct 2001 21:28:47 -0400; This is wrong. I'm sitting here looking at the top of my SB-220 with the cosmetic cover off. There are no gaps in the perforated aluminum shield over the entire top of the amplifier. I would never ha; /archives//html/Amps/2001-10/msg00313.html (8,722 bytes)
50. [AMPS] A Clone of an SB-220 by SBE (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Wed, 24 Oct 2001 12:25:44 -0400; Interesting, all right -- unless my eyes are failing me there is no plate bandswitch, and only the 10/11m coil is in place. Also the cooling does not not appear to extend below the chassis, so this a; /archives//html/Amps/2001-10/msg00461.html (8,469 bytes)
51. [AMPS] A Clone of an SB-220 by SBE (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Wed, 24 Oct 2001 20:00:34 -0400; I can't see the plate bandswitch wafer. I can see something there under the standoff for the plate line, but no switch. 73, Pete N4ZR -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: am; /archives//html/Amps/2001-10/msg00478.html (8,291 bytes)
52. [AMPS] Which Came First? (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Fri, 21 Sep 2001 15:25:10 -0400; Can anyone answer off the top of his or her head? Which series of amplifiers came first at Ameritron -- the AL-1200/1500/82 or the AL-800H/80B/etc.? 73, Pete N4ZR -- FAQ on WWW: http://www.contesting; /archives//html/Amps/2001-09/msg00397.html (6,624 bytes)
53. [AMPS] Linear AMP timing (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Wed, 08 Aug 2001 14:37:01 -0400; Well, I don't know, but when the T/R relay on my SB-220 began to stick in the "on" position, it turned out to be the bias contacts that were the worst burnt. Maybe a sign that they were trying to ope; /archives//html/Amps/2001-08/msg00091.html (8,645 bytes)
54. [AMPS] Amplifier T/R circuit behavior (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Sun, 19 Aug 2001 16:55:21 -0400; Can minor increases in input circuit lead length or stray capacitance make a major difference in how the amplifier behaves on one low HF band but not on others? My specific puzzle -- last year I inst; /archives//html/Amps/2001-08/msg00229.html (8,082 bytes)
55. [AMPS] Al HArbach WA4DRU (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Mon, 20 Aug 2001 01:16:05 -0400; The original Harbach web page redirects you to Jeff -- he bought the amplifier side of things. 73, Pete N4ZR -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Adminis; /archives//html/Amps/2001-08/msg00236.html (7,008 bytes)
56. [AMPS] Need help with HV Power Supply for 3CX800A7 (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Thu, 30 Aug 2001 08:10:49 -0400; The rectifier seems to be the key -- you might explore the unusual diode FAQ at http://margo.student.utwente.nl/el/componen/diodefaq.html. Varo was bought by Microsemi, and a call to them might get h; /archives//html/Amps/2001-08/msg00382.html (7,950 bytes)
57. [AMPS] Tuned Input Circuit Board (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Wed, 11 Jul 2001 11:34:03 -0400; Can we infer from this that replacing the 10 and 15m relays with something beefier (for example, the NAiS/Aromat relays used in the Top Ten relay boxes) would lead to a reliable input system? The pri; /archives//html/Amps/2001-07/msg00150.html (8,340 bytes)
58. [AMPS] Harbach SB-220 Fan Noise (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Sun, 15 Jul 2001 10:51:38 -0400; I understand that Harbach's replacement fan for the SB-220 has usefully more air flow. Is it much noisier than the stock fan? 73, Pete N4ZR No, no ... that's WEST Virginia -- FAQ on WWW: http://www.c; /archives//html/Amps/2001-07/msg00168.html (7,036 bytes)
59. [AMPS] Harbach SB-220 Fan Noise (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Sun, 15 Jul 2001 12:03:58 -0400; Well, it doesn't seem likely to be a problem, based on inputs received so far. Several folks report that their noise is no different. My main concern is to get a little more airflow, if I can, so it; /archives//html/Amps/2001-07/msg00170.html (7,583 bytes)
60. [AMPS] SELL: Heath SB220 RF Deck components (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Thu, 19 Jul 2001 10:15:33 -0400; For what it's worth, the Harbach replacement relay is $18 plus shipping. 73, Pete N4ZR No, no ... that's WEST Virginia -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.c; /archives//html/Amps/2001-07/msg00220.html (7,147 bytes)

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