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1. [Amps] AL-80B Trouble (score: 1): Author: Mike Schlamp <w5cul@sbcglobal.net>; Date: Fri, 25 Aug 2006 08:28:05 -0700 (PDT); Hi all, I am having my first problem with my AL-80B and I need some help in isolating the trouble, along with some signal tracing data that is not covered in the manual. Below is a synopsis of what i; /archives//html/Amps/2006-08/msg00654.html (7,659 bytes)
2. Re: [Amps] AL-80B trouble (score: 1): Author: "Roy Koeppe" <royanjoy@ncn.net>; Date: Fri, 25 Aug 2006 11:07:22 -0500; Stated; "...SYMPTOM: With the standby switch in standby, band-switch set for 80M, AC power applied to Amp, the meters read ~2700Vdc (normal is ~3000Vdc), 150ma Ip, and the Ig is showing a negative dr; /archives//html/Amps/2006-08/msg00655.html (7,372 bytes)
3. Re: [Amps] AL-80B Trouble (score: 1): Author: Scott Manthe <n9aa@arrl.net>; Date: Fri, 25 Aug 2006 11:30:21 -0500; This seems to be a very common occurrence in later Amperex tubes. The tube is at fault, not the amp- replace the tube and you'll likely get good service from the amp. 73, Scott, N9AA ________________; /archives//html/Amps/2006-08/msg00656.html (7,253 bytes)
4. Re: [Amps] AL-80B Trouble (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Fri, 25 Aug 2006 20:17:00 -0400; 73 Tom _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-08/msg00664.html (7,107 bytes)
5. Re: [Amps] AL-80B Trouble (score: 1): Author: Scott Manthe <n9aa@arrl.net>; Date: Sat, 26 Aug 2006 00:05:55 -0500; Rich, Hundreds of empirical observations from all makes of amplifiers must be wrong. Clearly, the problems must be the mysterious parasitic oscillation, which obviously is pushing the filament sidewa; /archives//html/Amps/2006-08/msg00665.html (8,317 bytes)
6. Re: [Amps] AL-80B trouble (score: 1): Author: R L Measures <r@somis.org>; Date: Fri, 25 Aug 2006 19:21:24 -0700; Agreed. Roy K. == The hot filament helix apparently bends horizontally from EMF during a burst of grid-current. IMO, this occurs during an intermittent VHF parasitic oscillation. Do you have access t; /archives//html/Amps/2006-08/msg00666.html (9,114 bytes)
7. Re: [Amps] AL-80B Trouble (score: 1): Author: R L Measures <r@somis.org>; Date: Fri, 25 Aug 2006 19:27:44 -0700; I do not agree, Scott. New Amperex tubes typically have a gridfilament potential withstanding ability of > 8kV, and a short is not going to occur unless some anomaly pushes the filament sideways, cau; /archives//html/Amps/2006-08/msg00667.html (8,905 bytes)
8. Re: [Amps] AL-80B Trouble (score: 1): Author: R L Measures <r@somis.org>; Date: Fri, 25 Aug 2006 19:39:28 -0700; Passing the buck. R L MEASURES, AG6K. 805-386-3734 r@somis.org _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-08/msg00668.html (8,208 bytes)
9. Re: [Amps] AL-80B Trouble (score: 1): Author: "W5CUL" <w5cul@sbcglobal.net>; Date: Sat, 26 Aug 2006 01:47:58 -0500; All, I appreciate everyone's comments and advice. Unlike some lists groups that I have subscribed to in the past, this group's participants are extremely knowledgeable and quick to respond in a time; /archives//html/Amps/2006-08/msg00670.html (10,087 bytes)
10. Re: [Amps] AL-80B Trouble (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sat, 26 Aug 2006 03:57:08 -0400; Mike, You are into a statistical thing. While some people like to pretend some sinister single event causes problems like this, the truth is tubes are very difficult to build. As a consequence there; /archives//html/Amps/2006-08/msg00671.html (9,289 bytes)
11. Re: [Amps] AL-80B Trouble (score: 1): Author: "Phil Clements" <philc@texascellnet.com>; Date: Sat, 26 Aug 2006 05:38:29 -0500; Mike: Just call RF Parts. They are very reputable and honest, IMO, and since they sell both brands, just ask them which one has the best track record on warranty replacement. The last time I bought; /archives//html/Amps/2006-08/msg00672.html (8,745 bytes)
12. Re: [Amps] AL-80B Trouble (score: 1): Author: Rod Elliott <ve3irf@sympatico.ca>; Date: Sat, 26 Aug 2006 10:46:50 +0000; I sympathize with Mike. About 3 years ago I bought an AL-80B that lost three 3-500s in seven months, all with grid-filament shorts. I posted here about this, which precipitated one of the previous ro; /archives//html/Amps/2006-08/msg00673.html (8,210 bytes)
13. Re: [Amps] AL-80B Trouble (score: 1): Author: GGLL <nagato@arnet.com.ar>; Date: Sat, 26 Aug 2006 08:44:44 -0300; Another way to test I've used, was to disconnect the +B lead, power on the amp and then measure the Grid-Filament isolation. In those three times tubes were blown, was any other event registered? (ex; /archives//html/Amps/2006-08/msg00674.html (11,786 bytes)
14. Re: [Amps] AL-80B Trouble (score: 1): Author: pegasus@mho.net; Date: Sat, 26 Aug 2006 11:36:31 -0600 (MDT); Let me offer a few empirical observation... Seventeen years ago... I received 3 year old SB-1000 (AL-80 in drag) that had just been gone through by Heath factory and a new tube installed. About ever; /archives//html/Amps/2006-08/msg00677.html (11,091 bytes)
15. Re: [Amps] AL-80B Trouble (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sat, 26 Aug 2006 17:29:42 -0400; what was happening. He most emphatically admonished me to write this guy in California for the nichrome supressor kit or I'd lose another tube in short order. I'd never even heard of nichrome, but I; /archives//html/Amps/2006-08/msg00680.html (10,779 bytes)
16. Re: [Amps] AL-80B Trouble (score: 1): Author: "W5CUL" <w5cul@sbcglobal.net>; Date: Thu, 7 Sep 2006 19:44:56 -0500; All, Again I would like to thank everyone who gave advice and help in trouble shooting my AL-80B. I just wanted to give one last update, as there were some people who were specifically watching this; /archives//html/Amps/2006-09/msg00137.html (10,044 bytes)
17. [Amps] AL-80B trouble (score: 1): Author: Keith Hamilton <tuner@zoominternet.net>; Date: Mon, 02 Mar 2009 11:36:23 -0500; I have an AL-80B that does not work on 40 meters. When I try to transmit my exciter shown infinate SWR and of course will not put out any RF. All other bands are OK. I will send it to Ameritron if ne; /archives//html/Amps/2009-03/msg00054.html (6,405 bytes)
18. Re: [Amps] AL-80B trouble (score: 1): Author: W4AWM@aol.com; Date: Mon, 2 Mar 2009 11:53:34 EST; Sounds like a problem in the input circuit, especially if it is a tuned one. Check caps, etc. 73, John, W4AWM **Need a job? Find employment help in your area. (http://yellowpages.aol.com/search?query; /archives//html/Amps/2009-03/msg00055.html (6,963 bytes)
19. Re: [Amps] AL-80B trouble (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Mon, 2 Mar 2009 13:13:49 -0500; The first place Id look is the output bandswitch contacts. Check continuity from the pi net side of the plate blocking cap to the Load cap. Since there are no input relays, very little goes wrong the; /archives//html/Amps/2009-03/msg00059.html (8,024 bytes)
20. Re: [Amps] AL-80B trouble (score: 1): Author: Keith Hamilton <tuner@zoominternet.net>; Date: Mon, 2 Mar 2009 16:47:04 -0500; Several people have suggested checking the 40m tuned input circuitry. Are the input coils switched inline only when transmitting? When the amp is in standby the swr is OK. Sorry for the newbie questi; /archives//html/Amps/2009-03/msg00070.html (8,127 bytes)

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