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1. [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)
2. 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)
3. [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)
4. [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)
5. 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)
6. [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)
7. [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)
8. [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)
9. [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)
10. 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)
11. 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)
12. [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)
13. [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)
14. [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)
15. [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)
16. [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)
17. [Amps] QSK-5 (score: 1): Author: "kingwood" <k5jv@kingwoodcable.com>; Date: Sat, 15 Aug 2009 11:06:32 -0500; Greetings to all, Thanks for all of the response to my last post. I was pleasantly surprised at the number. There really are a lot of different ideas on how the QSK-5 operates and methods of it's use; /archives//html/Amps/2009-08/msg00324.html (9,016 bytes)
18. [Amps] more observations on the QSK-5 (score: 1): Author: "kingwood" <k5jv@kingwoodcable.com>; Date: Fri, 14 Aug 2009 20:01:22 -0500; Greetings to all, After a few days playing with the stand alone QSK-5, I think I have it working just about as good as it will ever work. I had to fix two cold solder joints, tighten RCA Phono connec; /archives//html/Amps/2009-08/msg00321.html (9,992 bytes)
19. [Amps] correction (score: 1): Author: "kingwood" <k5jv@kingwoodcable.com>; Date: Wed, 12 Aug 2009 16:26:32 -0500; Greetings to all, In my last post about the diode mod in the QSK-5, used the term "Harbach Soft Start" when I should have said "Harbach Soft Key". 73 de Lon, K5JV 1110 Golden Bear Ln. Kingwood, TX 77; /archives//html/Amps/2009-08/msg00291.html (6,380 bytes)
20. [Amps] QSK-5 diode mod (score: 1): Author: "kingwood" <k5jv@kingwoodcable.com>; Date: Wed, 12 Aug 2009 16:21:12 -0500; Greetings to all, I just received a stand alone Ameritron QSK-5 that I bought on eBay. The unit would not key the Harbach soft start mod that was installed in my HL-2200 amp. An ohm meter check showe; /archives//html/Amps/2009-08/msg00290.html (8,075 bytes)

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