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21. Re: [Amps] AL-811 & 572's (score: 1): Author: "Jim W7RY" <w7ry@inbox.com>; Date: Wed, 9 Feb 2011 18:38:26 -0800; Because the H has 4 tubes and the non H has only 3. And the power supply is smaller. 73 Jim W7RY _______________________________________________ Amps mailing list Amps@contesting.com http://lists.con; /archives//html/Amps/2011-02/msg00078.html (14,174 bytes)
22. Re: [Amps] AL-811 & 572's (score: 1): Author: "W7MJM" <w7mjm@arrl.net>; Date: Wed, 9 Feb 2011 20:38:24 -0800; Thanks Bob and all those who responded to my queries. I now have a better understanding of the AL-811 vs. AL811H amplifier capabilities when retubed with three 572B tubes. To be sure, I'm not looking; /archives//html/Amps/2011-02/msg00079.html (11,232 bytes)
23. Re: [Amps] AL-811 & 572's (score: 1): Author: "W7MJM" <w7mjm@arrl.net>; Date: Wed, 9 Feb 2011 21:20:23 -0800; Joe, Just looked at the parts list for the AL-811 and AL-811H. The power supply transformer, T1, is listed for both versions of the amp as part #406-1532. So it's the same transformer. Which brings m; /archives//html/Amps/2011-02/msg00080.html (16,556 bytes)
24. Re: [Amps] AL-811 & 572's (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Thu, 10 Feb 2011 15:10:52 -0500; I can do almost that with 2 new tubes, 2400V, and 100W drive in a SB-200. Of course its pushing them and the PS very hard and its 6M and only done for a brief test. Multiband amps waste a lot of powe; /archives//html/Amps/2011-02/msg00089.html (16,062 bytes)
25. Re: [Amps] AL-811 & 572's (score: 1): Author: "W7MJM" <w7mjm@arrl.net>; Date: Thu, 10 Feb 2011 19:22:24 -0800; Brian, Yes indeed; it appears to be the same power supply transformer in both the AL-811 and the AL-811H. The conclusion I'm coming to is, IF you can run 800 watts PEP output from an AL-811H using 3; /archives//html/Amps/2011-02/msg00096.html (13,395 bytes)
26. Re: [Amps] AL-811 & 572's (score: 1): Author: "Thomas F. Giella NZ4O" <nz4o@tampabay.rr.com>; Date: Fri, 11 Feb 2011 16:46:33 -0500; Martin I own an AL-811 with three 572B's and get 800 watts out PEP easily on SSB but run it at 400 watts PEP. I own an AL-811H with four 572B's and get 900 watts out PEP easily on SSB but run it at 6; /archives//html/Amps/2011-02/msg00099.html (8,935 bytes)
27. Re: [Amps] AL-811 & 572's (score: 1): Author: "W7MJM" <w7mjm@arrl.net>; Date: Sun, 13 Feb 2011 10:49:11 -0800; "Martin I own an AL-811 with three 572B's and get 800 watts out PEP easily on SSB but run it at 400 watts PEP. I own an AL-811H with four 572B's and get 900 watts out PEP easily on SSB but run it at; /archives//html/Amps/2011-02/msg00102.html (10,859 bytes)
28. Re: [Amps] AL-811 & 572's (score: 1): Author: "W7MJM" <w7mjm@arrl.net>; Date: Sun, 13 Feb 2011 10:52:06 -0800; Oops. That quote was from NZ40, not NZ4Q. Got to clean my eyeglasses! Sorry for getting your call wrong, Thomas. -MM _______________________________________________ Amps mailing list Amps@contesting.; /archives//html/Amps/2011-02/msg00103.html (11,748 bytes)
29. Re: [Amps] AL-811 & 572's (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Tue, 15 Feb 2011 01:13:11 -0500; If you run 572Bs at say 1600 volts on the plates rather than 2400 as in the spec I would expect about 20% decrease in output and gain. Even going by the specs 3 572Bs would produce 900 watts output w; /archives//html/Amps/2011-02/msg00110.html (12,667 bytes)
30. Re: [Amps] AL-811 & 572's (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Tue, 15 Feb 2011 10:37:18 -0500; A well tweaked Clipperton L will do 1200W at 100W drive. The manual specifies maximum drive at 150W and it will do 1500W out but the bandswitch is already stressed so I dont recommend it. At 2400V th; /archives//html/Amps/2011-02/msg00118.html (15,020 bytes)
31. Re: [Amps] AL-811 & 572's (score: 1): Author: "W7MJM" <w7mjm@arrl.net>; Date: Tue, 15 Feb 2011 08:17:20 -0800; Thanks for the additional info, Bill. As I said, I run a trio of 572Bs in my AL-811 at a maximum of 600 watts PEP output, mas o menos, with no reports of distortion or splatter. Was just curious abou; /archives//html/Amps/2011-02/msg00120.html (13,738 bytes)

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