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1. [Amps] testing 572 B tubes (score: 1): Author: alan.kaul@att.net (alan.kaul@att.net); Date: Sat, 04 Mar 2006 10:33:14 +0000; Does anyone know if there is a way to test 572 B's? I recently acquired this AMP. It had "fairly new tubes" -- according to the previous owner perhaps 20-30 hours on them. I found I was unable to loa; /archives//html/Amps/2006-03/msg00058.html (7,225 bytes)
2. Re: [Amps] testing 572 B tubes (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Sat, 4 Mar 2006 12:16:10 +0100; 73/ Karl-Arne SM0AOM _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-03/msg00059.html (9,550 bytes)
3. Re: [Amps] testing 572 B tubes (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sat, 4 Mar 2006 12:44:03 +0100 (CET); If the tubes are soft, there will be (usually) a blue glow between electrodes when drawing current (I have seen it tend more to purple). The emission could be down, which would explain the problem: y; /archives//html/Amps/2006-03/msg00061.html (7,309 bytes)
4. Re: [Amps] testing 572 B tubes (score: 1): Author: "Phil Clements" <philc@texascellnet.com>; Date: Sat, 4 Mar 2006 09:52:40 -0600; What does the manual say that the anode voltage and current should be when tuned up? What is your actual voltage and current? What is the input vswr? Phil, K5PC _____________________________________; /archives//html/Amps/2006-03/msg00062.html (7,695 bytes)
5. Re: [Amps] testing 572 B tubes (score: 1): Author: "Mike" <noddie@comcast.net>; Date: Sat, 4 Mar 2006 08:39:20 -0800; Where can we get a copy of the article, is it posted someplace? mike 73/ Karl-Arne SM0AOM to the previous to more than 400-600W you mentioned as a possible a .01 mfd in parallel. designed for use in; /archives//html/Amps/2006-03/msg00064.html (9,764 bytes)
6. Re: [Amps] testing 572 B tubes (score: 1): Author: alan.kaul@att.net (alan.kaul@att.net); Date: Sat, 04 Mar 2006 18:44:47 +0000; -- Original message -- CQ Magazine online store has a CD set for $59.95 -- HR Magazine 1977-1983. Anyone have the CD? Or the original magazine? -- I forgot to mention, my AMP is a Clipperton L with 4; /archives//html/Amps/2006-03/msg00067.html (7,734 bytes)
7. Re: [Amps] testing 572 B tubes (score: 1): Author: "noddie" <noddie@comcast.net>; Date: Sat, 4 Mar 2006 11:20:30 -0800; Hi Alan, I have the same amp and the same problem; I am very interested following this thread. Please email me if somebody gives you the fix off for this problem off this group. I also changed the RF; /archives//html/Amps/2006-03/msg00069.html (8,954 bytes)
8. Re: [Amps] testing 572 B tubes (score: 1): Author: "Joe DiPietro, N2UF" <n2uf@joeham.net>; Date: Sat, 04 Mar 2006 14:19:11 -0500; I have April 1978 HR right here. Testing Power Tubes is Page 60-63. Joe, N2UF -- ++++++++++++++++++++++++++ Joe DiPietro, N2UF http://www.joeham.net N2UF@joeham.net ++++++++++++++++++++++++++ _______; /archives//html/Amps/2006-03/msg00070.html (10,841 bytes)
9. Re: [Amps] testing 572 B tubes (score: 1): Author: "Phil Clements" <philc@texascellnet.com>; Date: Sat, 4 Mar 2006 13:32:39 -0600; Measure the power going into the amp and the SWR. Make sure you are getting the recommended driving power. If your anode current and voltage are as listed in the manual when under full load, and you; /archives//html/Amps/2006-03/msg00071.html (8,503 bytes)
10. Re: [Amps] testing 572 B tubes (score: 1): Author: "Joe DiPietro, N2UF" <n2uf@joeham.net>; Date: Sat, 04 Mar 2006 14:46:35 -0500; I am not sure what copyright issues are involved with scanning and distributing the article. Any lawyers out there who can tell me if this would be considered a 'fair use'? If so, I would be glad to; /archives//html/Amps/2006-03/msg00072.html (8,794 bytes)
11. Re: [Amps] testing 572 B tubes (score: 1): Author: R@contesting.com;Measures <r@somis.org>; Date: Sat, 4 Mar 2006 17:02:33 -0800; Low emission causes gas ionization? Rich Measures, 805.386.3734, AG6K, www.somis.org _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/; /archives//html/Amps/2006-03/msg00080.html (8,729 bytes)
12. Re: [Amps] testing 572 B tubes (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 5 Mar 2006 12:57:58 +0100 (CET); The original questionner asked if maybe the tubes were soft. My suggestion was that if they weren't (no blue or purple glow between electrodes), low emission was a more likely cause of his problem. I; /archives//html/Amps/2006-03/msg00082.html (8,480 bytes)

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