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1. [Amps] AL-1200 Pop/Arching, 756 Pro II failure (score: 1): Author: Dana Roode <K6NR@ARRL.net>; Date: Fri, 10 Oct 2003 21:40:48 -0700; A question for those with AL-1200 repair experience -- I bought a used AL-1200 amp a few months ago - it has a low serial number, 108, so I assume its pretty old. I have used it in several contests a; /archives//html/Amps/2003-10/msg00080.html (8,075 bytes)
2. Re: [Amps] AL-1200 Pop/Arching, 756 Pro II failure (score: 1): Author: Dana Roode <K6NR@ARRL.net>; Date: Sun, 12 Oct 2003 13:32:52 -0700; Bill/Others -- I found that the resister in the copper coil from the plate of the tube leading to the tank circuit had indeed come unsoldered. This may sound naive, but would this make an arc? The co; /archives//html/Amps/2003-10/msg00095.html (9,856 bytes)
3. Re: [Amps] AL-1200 Pop/Arching, 756 Pro II failure (score: 1): Author: Dana Roode <K6NR@ARRL.net>; Date: Sun, 12 Oct 2003 13:43:57 -0700; Rich - - Does your AL-1200 have the "neutralization" circuit? I'm not sure, how do you tell? There is a small diameter red wire wrapped around a small toroid core feeding the +HV to the plate; there; /archives//html/Amps/2003-10/msg00096.html (8,470 bytes)
4. [Amps] AL-1200 Grid Current - negative? (score: 1): Author: Dana Roode <K6NR@ARRL.net>; Date: Sat, 08 Nov 2003 15:21:59 -0800; What does it mean when you power up an AL-1200 and the grid current meter pins negative (no drive power supplied)? Dana _______________________________________________ Amps mailing list Amps@contesti; /archives//html/Amps/2003-11/msg00110.html (6,696 bytes)
5. Re: [Amps] AL-1200 Grid Current - negative? (score: 1): Author: Dana Roode <K6NR@ARRL.net>; Date: Sun, 09 Nov 2003 11:36:49 -0800; Amps folks - Ok, I removed the tube and the meter still went negative. I checked the filament connections with the tube out, nothing is shorted to ground. I was suspect of the metering circuit itself; /archives//html/Amps/2003-11/msg00118.html (8,360 bytes)
6. Re: [Amps] AL-1200 Grid Current - negative? (score: 1): Author: Dana Roode <K6NR@ARRL.net>; Date: Sun, 09 Nov 2003 17:29:15 -0800; Continuing this thread... In addition to the bad resister inside the meter, the two 1.5 ohm grid resistors were open (thanks to W1QJ for encouraging me to check those too). Several weeks back I poste; /archives//html/Amps/2003-11/msg00119.html (9,507 bytes)
7. [Amps] SB220/221 - won't load on 80 (score: 1): Author: Dana Roode <K6NR@ARRL.net>; Date: Sun, 09 Nov 2003 17:48:59 -0800; Amp folks - I'm also working on a SB221 that belonged to my father (K6VO). He had this Amp out on his workbench for several years before he passed away in 1999. I have studied it to see what its stat; /archives//html/Amps/2003-11/msg00120.html (7,838 bytes)
8. [Amps] AL-1200 Questions (score: 1): Author: Dana Roode <K6NR@ARRL.net>; Date: Sat, 22 Nov 2003 09:36:30 -0800; Folks - My AL-1200 repair efforts continue. As you may recall, the parasitic suppresser came unsoldered and I had some sort of oscillation in the grid that took out the grid resistors, a resister in; /archives//html/Amps/2003-11/msg00319.html (7,110 bytes)
9. [Amps] sb-220 questions (score: 1): Author: Dana Roode <K6NR@ARRL.net>; Date: Sat, 22 Nov 2003 09:48:13 -0800; Folks - Im also working on a SB221 (modified for 10) that wont load on 80 under about 3.95 mhz. I measured the resonant frequency of the plate coil and it doesnt seem to dip below 4 mhz. I looked at; /archives//html/Amps/2003-11/msg00320.html (6,809 bytes)
10. [Amps] AL-1200 Resting Current (score: 1): Author: Dana Roode <K6NR@ARRL.net>; Date: Fri, 12 Dec 2003 19:08:10 -0800; Folks - I finally got a chance to accurately measure the resting plate current on my AL-1200 (See below) - its 12ma on CW (supposed to be 40) and 88 on SSB (should be 150). Does this sound like bad Z; /archives//html/Amps/2003-12/msg00219.html (7,860 bytes)
11. [Amps] Sb220 Tank Coil access (score: 1): Author: Dana Roode <K6NR@ARRL.net>; Date: Sun, 18 Apr 2004 12:41:55 -0700; Hello, Ive got a SB220 that has a tank coil resonant above 4mhz on 80m - evidently a previous owner took some turns off the coil. It looks like I have to do a good deal of disassembly to get to the b; /archives//html/Amps/2004-04/msg00117.html (6,988 bytes)
12. [Amps] AL-1200 Pop (score: 1): Author: Dana Roode <K6NR@ARRL.net>; Date: Sun, 04 Jul 2004 18:25:14 -0700; I just finished replacing the open frame relay in my old AL-1200 with the Ameritron relay PCB mod. Put it all back together, seemed to work fine, tuning on 40m. Moved to 160m, had the Amp in Standby; /archives//html/Amps/2004-07/msg00021.html (6,930 bytes)
13. [Amps] Replacing a AL-1200 blower/fan (score: 1): Author: Dana Roode <K6NR@ARRL.net>; Date: Mon, 12 Jul 2004 21:17:48 -0700; AL-1200 owners/experts -- My latest is problem is that my blower motor stopped spinning. Well, for a few hours, now its working again. Anyone know whats involved in replacing the blower? Mine appears; /archives//html/Amps/2004-07/msg00059.html (6,803 bytes)

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