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Total 6 documents matching your query.

1. [Amps] AL-572 Negative grid current? (score: 1): Author: Scott Manthe <n9aa@arrl.net>; Date: Sat, 11 Nov 2006 12:46:58 -0600; Hi Ampers, I bought a used Ameritron AL-572 in June and have just been able to check it out the last couple of weeks. (It's a long story involving moving into an OLD house...) Output seemed fine, but; /archives//html/Amps/2006-11/msg00148.html (7,736 bytes)
2. Re: [Amps] AL-572 Negative grid current? (score: 1): Author: "Robert B. Bonner" <rbonner@qro.com>; Date: Sat, 11 Nov 2006 12:56:45 -0600; Scott one of your tubes might have a grid cathode short. Remove one at a time to find the offender. BOB DD Hi Ampers, I bought a used Ameritron AL-572 in June and have just been able to check it out; /archives//html/Amps/2006-11/msg00149.html (8,599 bytes)
3. Re: [Amps] AL-572 Negative grid current? (score: 1): Author: "Scott Manthe" <n9aa@arrl.net>; Date: Sat, 11 Nov 2006 15:19:42 -0600; OK, time for more info. After removing all of the tubes, meter readings are OK. Putting one (I assume good) tube back in the amp causes the strangeness to begin again. Any ideas? 73, Scott, N9AA ____; /archives//html/Amps/2006-11/msg00150.html (6,407 bytes)
4. Re: [Amps] AL-572 Negative grid current? (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sat, 11 Nov 2006 17:47:13 -0500; When the amp has a typical grid and plate current metering system in the B- return lead: 1.) Any short from the filament or cathode to ground causes the grid meter to read backwards. Always backward; /archives//html/Amps/2006-11/msg00151.html (7,633 bytes)
5. Re: [Amps] AL-572 Negative grid current? (score: 1): Author: Scott Manthe <n9aa@arrl.net>; Date: Sun, 12 Nov 2006 10:53:23 -0600; Thanks to everyone for their suggestions, I really appreciate it! Well, I don't think it's a tube short, because the behavior is present until all the tubes are removed and then, with no tubes, the m; /archives//html/Amps/2006-11/msg00155.html (7,203 bytes)
6. Re: [Amps] AL-572 Negative grid current? (score: 1): Author: Scott Manthe <n9aa@arrl.net>; Date: Sun, 12 Nov 2006 11:15:24 -0600; OK, I have taken all the tubes out of the AL-572 and put only 1 in at a time and turned the amp on each time, with the same results: a slight negative pulling of the grid current meter and then a slo; /archives//html/Amps/2006-11/msg00156.html (7,668 bytes)

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