- 41. [Amps] Measuring HV thread (score: 1)
- Author: "kingwood" <k5jv@kingwoodcable.com>
- Date: Sun, 16 Aug 2009 12:40:36 -0500
- Greetings to all, Those of you who went to Dayton probably saw the HI voltage voltmeter I had in my trailer. It came out of Peter Dahl's shop. It read in steps of 0 to 5,000, 25,000, and 50,000 volts
- /archives//html/Amps/2009-08/msg00332.html (7,006 bytes)
- 42. [Amps] [Heathkit] The SB-220 (score: 1)
- Author: "k5jv" <k5jv@kingwoodcable.com>
- Date: Sat, 22 Aug 2009 14:13:18 -0500
- Greetings to all, I usually do not comment on topics like this but could not resist this time. I, also, have been repairing amps for about 40 years -- have probably worked on 100 SB-220's. I think it
- /archives//html/Amps/2009-08/msg00386.html (8,462 bytes)
- 43. [Amps] suppressor material (score: 1)
- Author: "k5jv" <k5jv@kingwoodcable.com>
- Date: Sat, 22 Aug 2009 16:32:58 -0500
- Greetings to all, Yes, I agree that there are better materials available for making parasitic suppressors -- stainless steel is just one good example. But, have you ever tried to fabricate a PRACTICA
- /archives//html/Amps/2009-08/msg00392.html (8,073 bytes)
- 44. [Amps] one mor SB-220 fix (score: 1)
- Author: "kingwood" <k5jv@kingwoodcable.com>
- Date: Sat, 22 Aug 2009 18:40:12 -0500
- Greetings to all, There is one other fix that should be really considered on the SB-220 that does not get much mention. The recent thread should be taken seriously. The subject is the RF choke across
- /archives//html/Amps/2009-08/msg00394.html (8,245 bytes)
- 45. [Amps] Design VS parasitic (score: 1)
- Author: "kingwood" <k5jv@kingwoodcable.com>
- Date: Sun, 23 Aug 2009 08:28:50 -0500
- Greetings to all, A couple of comments to my last post have prompted another reply. The question must be asked, "What causes a parasitic oscillation, in the first place?" The very basic answer is "st
- /archives//html/Amps/2009-08/msg00406.html (9,212 bytes)
- 46. Re: [Amps] one mor SB-220 fix (score: 1)
- Author: "kingwood" <k5jv@kingwoodcable.com>
- Date: Sun, 23 Aug 2009 08:55:34 -0500
- Gary, What you say about the RF choke reducing arcing is correct, but this is just one of its several functions. Your point about C1 arcing is a valid point. But, what if, as you say, it was set near
- /archives//html/Amps/2009-08/msg00407.html (7,953 bytes)
- 47. Re: [Amps] [HeathKit] The SB-220 (score: 1)
- Author: "kingwood" <k5jv@kingwoodcable.com>
- Date: Sun, 23 Aug 2009 12:08:29 -0500
- Dick, I would like to have a copy of this service bulletin also. The only one I have heard of dealt with fusing the, otherwise unprotected, filament transformer primary. Of course, this change should
- /archives//html/Amps/2009-08/msg00413.html (10,200 bytes)
- 48. [Amps] SB-220 mod (score: 1)
- Author: "kingwood" <k5jv@kingwoodcable.com>
- Date: Sun, 23 Aug 2009 12:21:10 -0500
- Greetings to all, I found this HeathKit Service Bulletin. If this is the bulletin Carl mentioned, it does apply to the filament transformer, but has absolutely nothing to do with what we were discuss
- /archives//html/Amps/2009-08/msg00416.html (8,324 bytes)
- 49. [Amps] SB-220 filament transformer failure (score: 1)
- Author: "k5jv" <k5jv@kingwoodcable.com>
- Date: Thu, 27 Aug 2009 10:35:33 -0500
- Greetings to all, Just had another SB-220 come in with a dead filament transformer. Someone had replaced the original transformer, that had also failed, with a brand new, expensive, Peter Dahl transf
- /archives//html/Amps/2009-08/msg00543.html (7,528 bytes)
- 50. [Amps] SB220 bias thread (score: 1)
- Author: "kingwood" <k5jv@kingwoodcable.com>
- Date: Sun, 30 Aug 2009 08:36:35 -0500
- Greetings to all, An interesting thread. If you use a trapezoid display to tune your linear amp, you will quickly see all the differences in tuning that are being mentioned. The most obvious conclusi
- /archives//html/Amps/2009-08/msg00631.html (8,018 bytes)
- 51. [Amps] 8874 pulls (score: 1)
- Author: "kingwood" <k5jv@kingwoodcable.com>
- Date: Mon, 21 Sep 2009 12:43:58 -0500
- Greetings to all, I have two sets (total of four) 8874's pulled from working Alpha amps that were converted to 3CX800's. These are probably the last 8874 pulls that I will have as I will no longer ma
- /archives//html/Amps/2009-09/msg00257.html (6,813 bytes)
- 52. Re: [Amps] LK-500-NTC v. SB-220 v. Clipperrton L (score: 1)
- Author: "kingwood" <k5jv@kingwoodcable.com>
- Date: Tue, 6 Oct 2009 07:31:05 -0500
- Greetings to all, "Required age to attain geezer status" Wow! That sounds like Mark Twain's "Threshold of age." 73 de Lon, K5JV 1110 Golden Bear Ln. Kingwood, TX 77339 281-358-4207 281-358-4234 FAX 2
- /archives//html/Amps/2009-10/msg00127.html (9,388 bytes)
- 53. [Amps] 4CX-1000/1500 in Collins 30S-1 (score: 1)
- Author: "kingwood" <k5jv@kingwoodcable.com>
- Date: Tue, 20 Oct 2009 13:43:30 -0500
- Greetings to all, The real important difference between the 1000 an the 1500 (other than price) is the grid dissipation rating. The 4CX-1000 has something like .1 watt grid dissipation rating while t
- /archives//html/Amps/2009-10/msg00280.html (6,853 bytes)
- 54. [Amps] {Collins} 30S-1 (score: 1)
- Author: "kingwood" <k5jv@kingwoodcable.com>
- Date: Tue, 20 Oct 2009 17:07:01 -0500
- Greetings to all, There is some misinformation being passed out here about these tubes. There are two common 4CX1,500 tube types, the "A", and the "B". The "A" tube has a 25 watt grid dissipation rat
- /archives//html/Amps/2009-10/msg00282.html (8,115 bytes)
- 55. Re: [Amps] {Collins} 30S-1 (score: 1)
- Author: "kingwood" <k5jv@kingwoodcable.com>
- Date: Wed, 21 Oct 2009 07:48:06 -0500
- Bill, The "1000" refers to the 4CX1000A tube and the "1500" refers to the 4CX1,500B. Do not mix up the 4CX1,500A with this bunch. It is a very different tube, with a very different base, and requires
- /archives//html/Amps/2009-10/msg00284.html (7,440 bytes)
- 56. [Amps] Choke from Warrior HA-10 amp (score: 1)
- Author: "k5jv" <k5jv@kingwoodcable.com>
- Date: Wed, 21 Oct 2009 09:23:19 -0500
- Greetings to all, I am in search for a power supply choke from a Heathkit Warrior, HA-10, amp. Cash or trade. 73 de Lon, K5JV 281-358-4207 281-795-1335 Cell __________________________________________
- /archives//html/Amps/2009-10/msg00285.html (6,512 bytes)
- 57. [Amps] Wanted Collins 30L-1 relay (score: 1)
- Author: "kingwood" <k5jv@kingwoodcable.com>
- Date: Fri, 4 Dec 2009 15:18:37 -0600
- Greetings to all, I need an antenna relay for a Collins 30L-1, original or after market, as long as it will fit. 73 de Lon, K5JV 1110 Golden Bear Ln. Kingwood, TX 77339 281-358-4207 281-358-4234 FAX
- /archives//html/Amps/2009-12/msg00117.html (6,461 bytes)
- 58. [Amps] QSK switching time (score: 1)
- Author: "k5jv" <k5jv@kingwoodcable.com>
- Date: Fri, 18 Dec 2009 11:56:22 -0600
- Greetings to all, I would like to share a great discussion that I was evolved in this morning on an 80 meter net about QSK, with some of my own comments. The basic argument is that because PIN diodes
- /archives//html/Amps/2009-12/msg00440.html (9,318 bytes)
- 59. [Amps] Response the "QSK switching time" (score: 1)
- Author: "kingwood" <k5jv@kingwoodcable.com>
- Date: Fri, 18 Dec 2009 14:53:26 -0600
- Greetings to all, I started responding to each reply off line. I am getting so many responses, and most are similar, so I am responding through the reflector. The idea of increased IMD is something I
- /archives//html/Amps/2009-12/msg00460.html (8,457 bytes)
- 60. [Amps] QSK-1500 chip (score: 1)
- Author: "kingwood" <k5jv@kingwoodcable.com>
- Date: Wed, 7 Jul 2010 14:59:05 -0500
- Greetings to all, I have located a source for the, hard to find, Motorola MC14011BCP chips. The only problem is that I must order 25 of them to get the price anywhere with reason. Does anyone have an
- /archives//html/Amps/2010-07/msg00072.html (6,938 bytes)
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