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1. Re: [Amps] AL1200, high input swr, all bands (score: 1): Author: Hal W5GHZ <w5ghz@yahoo.com>; Date: Mon, 18 Oct 2010 07:11:51 -0700 (PDT); Kevin, Check out the two Zener diodes above the filament transformer mounted on the wall. The high duty cycle may have burned out one or both. Hal W5GHZ I must have fried something in my AL-12; /archives//html/Amps/2010-10/msg00279.html (8,603 bytes)
2. Re: [Amps] AL-1200 debug at a distance: we might have a winner (W5GHZ) (score: 1): Author: Hal W5GHZ <w5ghz@yahoo.com>; Date: Tue, 19 Oct 2010 00:07:04 -0700 (PDT); It seems to be a common failure mode, Kevin. That arcing was most likely what you heard. If you can, clean up the mark left by the arc with some very fine wet/dry sand paper or emory cloth, about 8; /archives//html/Amps/2010-10/msg00291.html (11,313 bytes)
3. Re: [Amps] AL-1200 debug at a distance: we might have a winner(W5GHZ) (score: 1): Author: Hal W5GHZ <w5ghz@yahoo.com>; Date: Tue, 19 Oct 2010 07:25:10 -0700 (PDT); Gerald, Wouldn't that cause the grid to fail rather quickly? Hal W5GHZ Carl and all, if the plate choke opened, there would be no plate voltage or current alright. But, with drive, the grid curre; /archives//html/Amps/2010-10/msg00299.html (12,960 bytes)
4. Re: [Amps] diode junction temps and thermal resistance (score: 1): Author: Hal W5GHZ <w5ghz@yahoo.com>; Date: Tue, 19 Oct 2010 22:06:36 -0700 (PDT); Thermal compound can be highly conductive if you buy the right kind. Hal Carl: "There is an ample front to rear aluminum shield that is more than adequate to dissipate the 8W or so in normal use."; /archives//html/Amps/2010-10/msg00318.html (9,608 bytes)
5. Re: [Amps] AL-1200 debug at a distance: we might have a winner(W5GHZ) (score: 1): Author: Hal W5GHZ <w5ghz@yahoo.com>; Date: Tue, 19 Oct 2010 23:11:14 -0700 (PDT); Kevin, Don't forget to clean up the mark left by the arc (remember the sizzle you heard?). Then replace the diodes with the 50 watters and turn on the amp. Let us know how it works. Hal W5GHZ O; /archives//html/Amps/2010-10/msg00321.html (9,211 bytes)
6. Re: [Amps] AL-811H Question (score: 1): Author: Hal W5GHZ <w5ghz@yahoo.com>; Date: Fri, 22 Oct 2010 15:23:38 -0700 (PDT); Check the grid resistors. You probably destroyed one or more. Keep the old tubes, they may still be good. Mine did the same thing, but took out two of the tubes. Hal W5GHZ Recently replaced the; /archives//html/Amps/2010-10/msg00353.html (8,436 bytes)
7. [Amps] AL-811H (score: 1): Author: Hal W5GHZ <w5ghz@yahoo.com>; Date: Fri, 22 Oct 2010 19:39:49 -0700 (PDT); Charles, Did you check the grid resistors? I have an AL-811H that did the self destruct thing and it took out a couple of the grid resistor along with a couple of tubes. I posted this, but didn't; /archives//html/Amps/2010-10/msg00356.html (6,301 bytes)
8. [Amps] Bird 4381 RF Power Analyst (score: 1): Author: Hal W5GHZ <w5ghz@yahoo.com>; Date: Tue, 26 Oct 2010 21:20:28 -0700 (PDT); I too need a schematic for a Bird 4381 Power Analyst. The battery charging circuit is bad. Hal W5GHZ _______________________________________________ Amps mailing list Amps@contesting.com http://l; /archives//html/Amps/2010-10/msg00396.html (6,537 bytes)
9. Re: [Amps] Ameritron AL-572 (score: 1): Author: Hal W5GHZ <w5ghz@yahoo.com>; Date: Sun, 7 Nov 2010 12:11:35 -0800 (PST); Neutralize, do not ground the grids directly. Hal W5GHZ I have been trying to help a fellow ham get an AL-572 tamed down via emails. He had a tube short/arc and blow one of the 50 ohms to ground gr; /archives//html/Amps/2010-11/msg00034.html (8,667 bytes)
10. Re: [Amps] 1800 Watt Henry 2K4? (score: 1): Author: Hal W5GHZ <w5ghz@yahoo.com>; Date: Mon, 22 Nov 2010 04:28:22 -0800 (PST); Mike, Even with the best watt meter, ie: my Bird digital RF Power Analyst, if the load is mismatched, the forward power can read much higher than the actual output. This guy should also list the r; /archives//html/Amps/2010-11/msg00378.html (8,122 bytes)
11. Re: [Amps] 1800 Watt Henry 2K4? (score: 1): Author: Hal W5GHZ <w5ghz@yahoo.com>; Date: Tue, 23 Nov 2010 13:27:01 -0800 (PST); Jeremy, A good 2000 watt 50 ohm dummy load is an absolute necessity. Hal -- On Mon, 11/22/10, Carl <km1h@jeremy.mv.com> wrote: Thats where you really need a 2-30MHz slug to capture all the sp; /archives//html/Amps/2010-11/msg00407.html (9,366 bytes)
12. Re: [Amps] AL-811H with 572's question (score: 1): Author: Hal W5GHZ <w5ghz@yahoo.com>; Date: Sat, 27 Nov 2010 13:19:51 -0800 (PST); Hector, The tuning remains the same due to power supply limitations in the AL-811H. The advantage of using the 572B's is that the tube is more rugged and will withstand mis-tuning better. It will; /archives//html/Amps/2010-11/msg00519.html (8,302 bytes)
13. [Amps] 811A vs 572B (score: 1): Author: Hal W5GHZ <w5ghz@yahoo.com>; Date: Sun, 13 Feb 2011 19:44:09 -0800 (PST); My AL811H just went into VHF parasitic oscillation and took out a brand new set of 811A's, plate choke, several capacitors and a couple of resistors and the fuses. This is the second time this has h; /archives//html/Amps/2011-02/msg00104.html (7,616 bytes)
14. Re: [Amps] WARNING! W4RT (score: 1): Author: Hal W5GHZ <w5ghz@yahoo.com>; Date: Thu, 14 Apr 2011 09:08:37 -0700 (PDT); John, just because Roger mentioned "PayPal" doesn't mean he bought the item on eBay. PayPal services many other companies. You know what happens when you ass-u-me something. I also like to hear abo; /archives//html/Amps/2011-04/msg00419.html (9,205 bytes)
15. Re: [Amps] 87a cured (score: 1): Author: Hal W5GHZ <w5ghz@yahoo.com>; Date: Tue, 17 Jan 2012 07:02:27 -0800 (PST); It is never a good thing to leave electronic equipment in hot, humid conditions. Even those new fancy and expensive rigs hate those conditions. The humidity can be absorbed into the pc board and ca; /archives//html/Amps/2012-01/msg00149.html (9,453 bytes)
16. Re: [Amps] SB-200 (score: 1): Author: Hal W5GHZ <w5ghz@yahoo.com>; Date: Thu, 9 Feb 2012 19:25:18 -0800 (PST); My vote is for the grid resistor and cap W5GHZ ________________________________ From: "TexasRF@aol.com" <TexasRF@aol.com> To: w7why@frontier.com; amps@contesting.com Sent: Friday, February 10, 2012 1; /archives//html/Amps/2012-02/msg00084.html (9,193 bytes)
17. Re: [Amps] AL-811H (score: 1): Author: Hal W5GHZ <w5ghz@yahoo.com>; Date: Mon, 27 Feb 2012 09:38:27 -0800 (PST); I have an AL-811H that was given to me. Had to replace the tubes and have had nothing but problems. I can't get the amp to neutralize no mater what I do. I haven't tried 572B's yet. Sure wish I c; /archives//html/Amps/2012-02/msg00286.html (11,390 bytes)
18. Re: [Amps] Squirrely 30L-1 (score: 1): Author: Hal W5GHZ <w5ghz@yahoo.com>; Date: Fri, 15 Jun 2012 08:43:09 -0700 (PDT); Jerry, You could try detuning the input coil a bit on 15 meters. Maybe a quarter turn at most. Be careful not to crack the slug. I have two of those amps and never had a problem with them. Hal W5G; /archives//html/Amps/2012-06/msg00143.html (10,045 bytes)
19. Re: [Amps] 300 W single band mobile amp needed (score: 1): Author: Hal W5GHZ <w5ghz@yahoo.com>; Date: Sun, 7 Oct 2012 14:09:25 -0700 (PDT); Whats is the point? Your friend is wanting a linear amplifier that has a narrow tuning range of 200 KHz, 14.150 MHz to 14.350 MHz., assuming he is an Extra. Why does he want to eliminate the lower p; /archives//html/Amps/2012-10/msg00047.html (10,301 bytes)
20. Re: [Amps] 300 W single band mobile amp needed (score: 1): Author: Hal W5GHZ <w5ghz@yahoo.com>; Date: Mon, 8 Oct 2012 11:10:21 -0700 (PDT); Good points, Jim, but you still have to design the amp and a ready made one can be left in the 20 meter position and drive reduced. To get the narrow phone band only operation you would have to re-d; /archives//html/Amps/2012-10/msg00061.html (11,008 bytes)

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