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21. Re: [Amps] IM distortion and such (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Mon, 26 Jun 2006 20:53:45 -0400; I don't know why. With just a little bit of searching, I found a 3-500Z spec sheet that clearly shows constant current curves going as high as 2.2 amps! (Here:<http://www.mif.pg.gda.pl/homepages/fran; /archives//html/Amps/2006-06/msg00474.html (8,190 bytes)
22. Re: [Amps] IM distortion and such (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Mon, 26 Jun 2006 21:17:21 -0400; In mechanical engineering, they usually refer to this as a "design rule". For example, light aircraft are typically designed to withstand 3.8 positive Gs (in the Normal category). But, you wouldn't b; /archives//html/Amps/2006-06/msg00476.html (10,255 bytes)
23. Re: [Amps] IM distortion and such (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Mon, 26 Jun 2006 21:39:21 -0400; The single quickest way to bankruptcy for a manufacturing organization is excess capacity. There are many ways to get there, not all are in the hands of the engineers. There are a number of greatly e; /archives//html/Amps/2006-06/msg00480.html (9,117 bytes)
24. Re: [Amps] IM distortion and such (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Mon, 26 Jun 2006 21:45:54 -0400; So, Mike, explain to me how the manufacturer can get constant current curves all the way up to 2.2 A if the maximum plate current is .4 A. Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net Quote: "No; /archives//html/Amps/2006-06/msg00482.html (9,585 bytes)
25. Re: [Amps] IM distortion and such (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Mon, 26 Jun 2006 21:52:02 -0400; In this litigious society, you can't do anything to positively avoid lawsuits except to close up shop. I don't know if Ameritron has a letter from Eimac or not. That's really immaterial. Bill Coleman; /archives//html/Amps/2006-06/msg00483.html (8,837 bytes)
26. Re: [Amps] QRO membership revoked (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Tue, 18 Jul 2006 21:56:17 -0400; Sounds interesting, Tom, what were rig were you operating? Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net Quote: "Not within a thousand years will man ever fly!" -- Wilbur Wright, 1901 ___________; /archives//html/Amps/2006-07/msg00611.html (8,401 bytes)
27. Re: [Amps] Grid Vs cathode drive (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Sat, 5 Aug 2006 11:54:25 -0400; I was just looking at the 160m history information on your own site, Tom, and seems like there were plenty of guys in the 30s who ran a handful of watts. And there are certainly a lot of Novice rigs; /archives//html/Amps/2006-08/msg00187.html (10,225 bytes)
28. Re: [Amps] Tokyo Hy-Power and Elecraft (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Tue, 19 Dec 2006 21:42:21 -0500; So far as anyone knows, it is still in the works. Last heard, they were waiting for FCC type certification, as is required in the USA. Latest estimate was that both the 800 and 1500W units would be a; /archives//html/Amps/2006-12/msg00179.html (6,978 bytes)
29. Re: [Amps] Ameritron AL-80A Receive muted - relay? (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Sat, 2 Jan 2010 02:46:32 -0500; Relay contacts aren't fully connecting on receive every time. When I first got my AL-80A from K4GA, it was doing this as well. You need to clean the contacts. Don't use anything as abrasive as emory; /archives//html/Amps/2010-01/msg00009.html (7,385 bytes)
30. Re: [Amps] [Bulk] Help identifying tubes (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Sun, 28 Nov 2010 23:24:59 -0500; Looks more like a 4-400A. Go to Google and then click on images and search a bit. 3-500Z / 3-400Z don't have the metal base. Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@mac.com Quote: "We invented perso; /archives//html/Amps/2010-11/msg00530.html (8,375 bytes)
31. Re: [Amps] Ameritron AL-80A (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Mon, 16 May 2011 18:39:06 -0400; I added a step-start circuit to my AL-80A, and it reduced the incidence of the hard THUMP at power-on. In my opinion it is a simple and worthwhile modification. Bill Coleman, AA4LR, PP-ASEL Mail: aa4; /archives//html/Amps/2011-05/msg00189.html (7,622 bytes)
32. Re: [Amps] [Bulk] Re: Picture tubes (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Mon, 16 May 2011 18:56:52 -0400; I have a 50 watt (output) 6146 "Novice" transmitter that uses the transformer out of a 17" Emerson Black and White TV. The TV originally had about 17 tubes. It has no trouble at all producing about 7; /archives//html/Amps/2011-05/msg00190.html (9,800 bytes)
33. [Amps] AL-80A - Grid Meter Replacement (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Tue, 17 May 2016 21:02:35 -0400; OK, Ive got an AL-80A that works pretty well. Last April, I was tuning up on 17m and I heard a SNAP, and suddenly the meters read all wacky. The Grid current meter would pin when keyed, and the plate; /archives//html/Amps/2016-05/msg00028.html (8,428 bytes)
34. [Amps] AL-80A - Grid Meter Replacement (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Fri, 20 May 2016 15:14:01 -0400; OK, Ive got an AL-80A that works pretty well. Last April, I was tuning up on 17m and I heard a SNAP, and suddenly the meters read all wacky. The Grid current meter would pin when keyed, and the plate; /archives//html/Amps/2016-05/msg00031.html (8,393 bytes)
35. [Amps] AL-80A - Won't tune on 160m. (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Wed, 22 Jun 2016 18:56:06 -0400; I managed to fix my issues with the metering circuits on the AL-80A. However, while it appears to work correctly on 80-10m, I cannot get the output network circuit to resonate on 160m. I hooked it up; /archives//html/Amps/2016-06/msg00078.html (6,944 bytes)
36. Re: [Amps] AL-80A - Won't tune on 160m. (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Fri, 2 Sep 2016 20:11:02 -0400; I finally got the AL-80A on the bench again and found that the switch contacts for the extra plate circuit capacitance are burnt away. Since Ive never used the amp on 160m, this wasnt me, but probab; /archives//html/Amps/2016-09/msg00004.html (7,640 bytes)
37. Re: [Amps] AL-80A - Won't tune on 160m. (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Mon, 5 Sep 2016 11:48:51 -0400; Thanks for the picture, George. No, my AL-80A did not have this washer. Ill certainly add it when I make the repair. Hey, for anyone that is interested, I wrote up my latest mis-adventure with the A; /archives//html/Amps/2016-09/msg00007.html (9,524 bytes)
38. Re: [Amps] AL-80A - Won't tune on 160m. (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Mon, 5 Sep 2016 11:53:40 -0400; Will do! Yes, Ive read the debates on this. Uh. Yeah. I have no choice but to do this now Part has been ordered. Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net Web: http://boringhamradiopart.blog; /archives//html/Amps/2016-09/msg00008.html (9,381 bytes)
39. Re: [Amps] AL-80A - Won't tune on 160m. (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Fri, 23 Sep 2016 17:38:57 -0400; Just a follow-up. Replaced the RF choke, replaced the switch contacts, added the corona washer. You can read about the repair on my blog: http://boringhamradiopart.blogspot.com/2016/09/ameritron-al-; /archives//html/Amps/2016-09/msg00107.html (10,012 bytes)
40. [Amps] AL-80A - Pi/Pi-L Switch Wafer Failure due to arcing (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Fri, 27 Jul 2018 16:42:04 -0400; I have an Ameritron AL-80A, which unfortunately during the KH1/KH7Z expedition experienced bandswitch arcing when used on 17m in the 20m bandswitch position. (Oops!) The arc melted the contact on the; /archives//html/Amps/2018-07/msg00080.html (7,362 bytes)

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