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1. [Amps] 572Bs (score: 1): Author: Paul Manuel <k4pdm@yahoo.com>; Date: Wed, 19 Jan 2011 05:11:43 -0800 (PST); Good morning. I'm a new list member and I've really learned a lot from the archives. The knowledge is much appreciated. Now a couple of questions...where do most of you buy quality 572Bs at a reasona; /archives//html/Amps/2011-01/msg00183.html (7,115 bytes)
2. Re: [Amps] 572Bs (score: 1): Author: Paul Manuel <k4pdm@yahoo.com>; Date: Wed, 19 Jan 2011 05:26:26 -0800 (PST); Thanks, Randy. That brings up another question, is matching important in grounded grid operation (a Clipperton L?) I read somewhere that it is not. 73, Paul K4PDM ____________________________________; /archives//html/Amps/2011-01/msg00184.html (6,652 bytes)
3. Re: [Amps] 572Bs (score: 1): Author: "Mitch Cox" <ww4cox@embarqmail.com>; Date: Wed, 19 Jan 2011 10:27:56 -0500; Paul, I am sure you will receive many answers to your question on this subject. I will give you an answer that pertains to my experience with 572B's. I have built many amplifiers over the years for p; /archives//html/Amps/2011-01/msg00186.html (8,991 bytes)
4. Re: [Amps] 572Bs (score: 1): Author: Al Kozakiewicz <akozak@hourglass.com>; Date: Wed, 19 Jan 2011 10:26:47 -0500; In any realistic parallel application. matching is not important. You match tubes for gain in a push-pull configuration to ensure linearity as each tube only conducts for half a cycle. Al AB2ZY Thank; /archives//html/Amps/2011-01/msg00187.html (7,463 bytes)
5. Re: [Amps] 572Bs (score: 1): Author: Alek Petkovic <vk6apk@bigpond.com>; Date: Thu, 20 Jan 2011 06:21:19 +0800; That's certainly different to my experience Mitch. The 200+, Shuguang (Chinese) 572B, that I have bought direct from China and onsold to hams in VK have been absolutely superb. I have had just 2 fail; /archives//html/Amps/2011-01/msg00188.html (11,631 bytes)
6. Re: [Amps] 572Bs (score: 1): Author: "Mitch Cox" <ww4cox@embarqmail.com>; Date: Wed, 19 Jan 2011 17:48:27 -0500; I have no way of knowing where the Chinese tubes I have experienced have come from. The brands that I have tried would include; Taylor, RF Parts select, Penta (X dealer), Jet Stream and the no name w; /archives//html/Amps/2011-01/msg00189.html (12,901 bytes)
7. Re: [Amps] 572Bs (score: 1): Author: Alek Petkovic <vk6apk@bigpond.com>; Date: Thu, 20 Jan 2011 06:57:57 +0800; My pleasure Mitch I get mine from a supplier in China but you can get them from the guy below at exactly the same prices. I have bought from him also and I believe that Carl, KM1H has dealt with him; /archives//html/Amps/2011-01/msg00190.html (16,960 bytes)
8. Re: [Amps] 572Bs (score: 1): Author: Al Kozakiewicz <akozak@hourglass.com>; Date: Wed, 19 Jan 2011 18:01:56 -0500; I thought the Svetlana tubes were long out of production? Al AB2ZY My pleasure Mitch I get mine from a supplier in China but you can get them from the guy below at exactly the same prices. I have bou; /archives//html/Amps/2011-01/msg00191.html (17,688 bytes)
9. Re: [Amps] 572Bs (score: 1): Author: "Hsu" <hsu4qro@gmail.com>; Date: Thu, 20 Jan 2011 07:41:15 +0800; Alek, Frankly, this price even lower than I can get from my dealer.I know the manufacturer's list price,this price only few gross profit.If the manufacturer return some gain to seller in the end of a; /archives//html/Amps/2011-01/msg00192.html (18,741 bytes)
10. Re: [Amps] 572Bs (score: 1): Author: "Mitch Cox" <ww4cox@embarqmail.com>; Date: Wed, 19 Jan 2011 18:53:48 -0500; There are thousands of the Russian tubes still on the market. I have been buying them constantly without having any trouble finding them for the past 10 years. They may not be making them as the rumo; /archives//html/Amps/2011-01/msg00193.html (17,682 bytes)
11. Re: [Amps] 572Bs (score: 1): Author: "Mitch Cox" <ww4cox@embarqmail.com>; Date: Wed, 19 Jan 2011 18:59:59 -0500; I have ordered them. At that price if they are just close the Russian tube they will be well worth the effort. Thanks for the information. Best Regards, Mitch W4COX -- Original Message -- From: Alek; /archives//html/Amps/2011-01/msg00194.html (17,217 bytes)
12. Re: [Amps] 572Bs (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 19 Jan 2011 22:06:35 -0500; Ive been buying direct from China for several years and have been very pleased. Honest and quick delivery as well as reliable. A Clipperton L needs other help before installing them, especially bette; /archives//html/Amps/2011-01/msg00197.html (8,710 bytes)
13. Re: [Amps] 572Bs (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 19 Jan 2011 22:26:54 -0500; Thats the first Ive ever heard of that, better tell the old BC engineers who just used what came in the door. OTOH, in parallel you are dealing with a single bias supply or lack therof for zero bias.; /archives//html/Amps/2011-01/msg00198.html (9,830 bytes)
14. Re: [Amps] 572Bs (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 19 Jan 2011 22:36:58 -0500; I sure hope so, they are a very unstable tube as replacements in many amps without some rework and especially neutralization. I wound up using them for AM modulators or replacing 811A's at lower volt; /archives//html/Amps/2011-01/msg00199.html (19,466 bytes)
15. Re: [Amps] 572Bs (score: 1): Author: Paul Manuel <k4pdm@yahoo.com>; Date: Thu, 20 Jan 2011 07:16:19 -0800 (PST); Thanks for all the responses. Looks like there is no real concensus on current Russian or Chinese tube quality. Lots of different experiences. Maybe some work better in some amplifier designs than ot; /archives//html/Amps/2011-01/msg00200.html (8,145 bytes)
16. Re: [Amps] 572Bs (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Thu, 20 Jan 2011 08:54:31 -0800 (PST); I believe that they just cannot be sold under the brand name here in the United States. It has something to do with a failed agreement between Svetlana and a stateside company. Glen, K9STH Website: h; /archives//html/Amps/2011-01/msg00202.html (8,151 bytes)
17. Re: [Amps] 572Bs (score: 1): Author: "Hsu" <hsu4qro@gmail.com>; Date: Fri, 21 Jan 2011 01:38:21 +0800; The Chinese 572B's manufacturer Jingguang just a second-rate tube manufacturer in China. The best glass bottle maunfacturer is BOE Groups(http://www.boe.com.cn/) and Sanle Groups,.( 3-500Z 's manufac; /archives//html/Amps/2011-01/msg00203.html (9,381 bytes)

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