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1. [Amps] 572B (score: 1): Author: "c." <carlseye@tampabay.rr.com>; Date: Tue, 23 Jan 2007 16:32:26 -0500; I don't remember asking this but does anyone know if the Taylor 572B's advertised by RF PARTS are chinese made ?? carl / kz5ca _______________________________________________ Amps mailing list Amps@c; /archives//html/Amps/2007-01/msg00236.html (6,147 bytes)
2. Re: [Amps] 572B (score: 1): Author: Scott Manthe <n9aa@arrl.net>; Date: Tue, 23 Jan 2007 17:23:04 -0600; I believe all new 572Bs are chinese. The Taylors seem to be good tubes. I run them in my AL-572 with no problems. 73, Scott, N9AA _______________________________________________ Amps mailing list Amp; /archives//html/Amps/2007-01/msg00238.html (7,128 bytes)
3. Re: [Amps] 572B (score: 1): Author: "Mike (K6BR)" <noddy1211@sbcglobal.net>; Date: Tue, 23 Jan 2007 15:36:47 -0800; Yup, all Chinese and work okay, maybe a bit more gain and could be a problem for some. --Original Message-- I believe all new 572Bs are chinese. The Taylors seem to be good tubes. I run them in my AL; /archives//html/Amps/2007-01/msg00239.html (7,708 bytes)
4. Re: [Amps] 572B (score: 1): Author: "Roy" <royanjoy@ncn.net>; Date: Sun, 1 Jul 2007 10:03:03 -0500; "did Amperex make a 572B/T160L ?? just wondering" c.s. never saw or heard of one r.k. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com; /archives//html/Amps/2007-07/msg00005.html (6,473 bytes)
5. Re: [Amps] 572B (score: 1): Author: "Tom Osborne" <w7why@verizon.net>; Date: Sun, 01 Jul 2007 08:21:10 -0700; Check this link for some on eBay. 73 Tom W7WHY http://cgi.ebay.com/Pair-Amperex-572B-exc-cond-Transmitting-Triode-x2_W0QQitemZ260108706973QQihZ016QQcategoryZ48710QQrdZ1QQssPageNameZWD1VQQcmdZViewItem; /archives//html/Amps/2007-07/msg00006.html (6,543 bytes)
6. Re: [Amps] 572B (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Sun, 1 Jul 2007 17:29:07 -0400; I have a pair of Amperex here. Also GE and Raytheon plus several private labeled versions such as Dentron, Waters, Hunter. The shape/size of the bulb, the black base and style of lettering tells me t; /archives//html/Amps/2007-07/msg00015.html (8,127 bytes)
7. [Amps] 572b (score: 1): Author: Matthew McCloskey <hidesertdrifter@live.com>; Date: Thu, 2 May 2013 12:56:25 -0600; There's no doubt that the manufacturer is the problem, but since they are the only one making them and most Ham's just need a few, a reputable distributer is very important in the supply chain. He te; /archives//html/Amps/2013-05/msg00017.html (6,791 bytes)
8. Re: [Amps] 572b (score: 1): Author: L L bahr <pulsarxp@embarqmail.com>; Date: Thu, 2 May 2013 18:00:37 -0400 (EDT); If quality control is so poor, how do you test for longevity or robustness? Just checking the emission when new may have nothing to do with longevity. I'd like to know how well a Chinese 572B will ho; /archives//html/Amps/2013-05/msg00020.html (8,443 bytes)
9. Re: [Amps] 572b (score: 1): Author: "Jeff Blaine" <keepwalking188@yahoo.com>; Date: Thu, 2 May 2013 17:22:34 -0500; I have used about 8 of the Chinese 572 specifically for torture testing in RTTY service and I can say without qualification that the plate dissipation limit (IIRC 160w) is not something which will ke; /archives//html/Amps/2013-05/msg00021.html (10,262 bytes)
10. Re: [Amps] 572b (score: 1): Author: MU 4CX250B <4cx250b@miamioh.edu>; Date: Thu, 2 May 2013 16:32:00 -0600; I'm afraid I don't understand why the plate dissipation would affect longevity, provided the tubes have adequate cooling. Exceeding rated grid current or plate current, or using the wrong filament vo; /archives//html/Amps/2013-05/msg00022.html (11,089 bytes)
11. Re: [Amps] 572b (score: 1): Author: "Jeff Blaine" <keepwalking188@yahoo.com>; Date: Thu, 2 May 2013 17:39:15 -0500; Jim, I don't know why either. Maybe I don't understand the spec or the application or some other error. Or it could be a faster roll off in emission at higher sustained currents. No idea. I gave up o; /archives//html/Amps/2013-05/msg00023.html (11,980 bytes)
12. Re: [Amps] 572b (score: 1): Author: Alek Petkovic <vk6apk@bigpond.com>; Date: Fri, 03 May 2013 06:50:10 +0800; Usually the filament volts gets 'em. For example, here in VK6, in the old Yaesu 2100 amps, the filament voltage is around 7% high. In the Ameritrons, it is 10% high. Our mains typically reach 245V. O; /archives//html/Amps/2013-05/msg00024.html (13,007 bytes)
13. Re: [Amps] 572b (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Thu, 2 May 2013 19:11:10 -0400; The 160W Pd of the Chinese tubes is a fallacy many fall into atho the Shuguan spec clearly states 125W and I dont care what RFP claims. The last few batches appear to have thicker anodes but I stress; /archives//html/Amps/2013-05/msg00025.html (12,125 bytes)
14. Re: [Amps] 572b (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Thu, 02 May 2013 19:14:16 -0700; On 5/2/2013 3:32 PM, MU 4CX250B wrote: I'm afraid I don't understand why the plate dissipation would affect longevity, provided the tubes have adequate cooling. Exceeding rated grid current or plate; /archives//html/Amps/2013-05/msg00026.html (9,504 bytes)
15. Re: [Amps] 572b (score: 1): Author: L L bahr <pulsarxp@embarqmail.com>; Date: Thu, 2 May 2013 20:00:04 -0400 (EDT); Makes no sense comparing to older tubes? It makes a lot of sense to me. They are a benchmark for the new Chinese tubes quality. It has nothing to do with obtaining them. Lee, w0vt That's because you; /archives//html/Amps/2013-05/msg00028.html (8,279 bytes)
16. [Amps] 572B (score: 1): Author: "Roger Gates" <w7kvt@wvi.com>; Date: Sat, 17 Jan 2015 15:07:43 -0800; I had an unexpected failure of one of the 572B's in my AL-572 amplifier and am now looking for a replacement. Would anyone on the list happen to have one residing on the shelf, with no possibility of; /archives//html/Amps/2015-01/msg00141.html (6,960 bytes)
17. Re: [Amps] 572B (score: 1): Author: "Hsu" <hsu4qro@gmail.com>; Date: Sun, 18 Jan 2015 07:56:03 +0800; I just contact the manufacturer, they told me ,it is short of material,they can not make 572B before end of next month. next month is a very long holiday in China. I had an unexpected failure of one; /archives//html/Amps/2015-01/msg00143.html (7,396 bytes)
18. [Amps] 572B (score: 1): Author: "Roger Gates" <w7kvt@wvi.com>; Date: Sun, 25 Jan 2015 14:24:32 -0800; Hey guys, I still need one more 572B to get this AL572 back in full operation. I received a nice Cetron from Colin and a couple of used Chinese ones from William, but am still short one. If you have; /archives//html/Amps/2015-01/msg00285.html (6,840 bytes)

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