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Re: [Amps] 572Bs

To: <amps@contesting.com>, "Alek Petkovic" <vk6apk@bigpond.com>
Subject: Re: [Amps] 572Bs
From: "Mitch Cox" <ww4cox@embarqmail.com>
Date: Wed, 19 Jan 2011 18:59:59 -0500
List-post: <amps@contesting.com">mailto:amps@contesting.com>
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 Petkovic 
  To: amps@contesting.com 
  Sent: Wednesday, January 19, 2011 5:57 PM
  Subject: Re: [Amps] 572Bs


  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 on numerous occasions.

  
http://stores.ebay.com/qMall/Tube-/_i.html?_fsub=7152201&_sid=214893880&_trksid=p4634.c0.m322

  73, Alek
  VK6APK


  At 06:48 AM 20/01/2011, Mitch Cox wrote:
  >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 white 
  >box variety. I cannot recommend any of these to anyone for any 
  >reason. The quality control on the afore mentioned that I have 
  >purchased were terrible, never 2 the same length, had alignment 
  >problems with the grid and filament structures, lost the anode caps, 
  >were not glued to the base correctly and the ones that didn't flash 
  >over immediately or did actually light up and work, didn't last 6 
  >months. If you can tell me what brand name they are selling in the 
  >US under I would be more than happy to purchase them and gladly give 
  >them a try. If in fact they are marketed under a brand I have 
  >already mentioned don't bother because myself and thousands of other 
  >US hams have had or are experiencing the same problems with these 
  >products daily. Ameritron has piles of them that have been returned.
  >Best Regards,
  >Mitch
  >W4COX
  >----- Original Message -----
  >From: <mailto:vk6apk@bigpond.com>Alek Petkovic
  >To: <mailto:amps@contesting.com>amps@contesting.com
  >Sent: Wednesday, January 19, 2011 5:21 PM
  >Subject: Re: [Amps] 572Bs
  >
  >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 failures "out of the box" and none after that in
  >the 7 years that I have been handling them. I have had zero failures
  >of any kind from a similar number of 811A tubes from the same factory.
  >
  >The 2 failed 572B's were replaced without question on my subsequent
  >order from the supplier in China.
  >
  >Not only are they superb in that regard, they are plug and play with
  >the Cetron variety and they really produce the grunt when needed and
  >their longevity is excellent when care is taken with filament voltage.
  >
  >I can't say anything other than I am really impressed with them.
  >
  >
  >73, Alek
  >VK6APK
  >
  >At 11:27 PM 19/01/2011, Mitch Cox wrote:
  > >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 people using this
  > >tube, only 3 last year and one so far this year. In my experience
  > >the Russian tube is by far superior to what is available from the
  > >Chinese today regardless of the name or label printed on them. In
  > >the past 10 years I have found that the Chinese tubes have about a
  > >40% failure rate new, out of the box here. So far I have had one
  > >Svetlana tube fail to light out of about 50 that has been through my
  > >shop. The Svetlana tubes last much longer and have much higher stage
  > >gain than any of the Chinese tubes that I have tried. I have had
  > >very good luck purchasing these tubes from Frank Krize, K5SVC at
  > >Krize Electronics. I am pretty sure that my experience is not an
  > >exception but keep in mind that a fellow asked a simple question
  > >about a fuse about 5 weeks ago and that lasted at least 3 weeks on
  > >this forum venturing from a simple fuse question blossoming into
  > >fluid induction breakers. There are a lot of people who don't co
  > >  nsider the 572B a worthwhile venture but for $150.00 for 3, they
  > > pretty much equal the performance of a 3-500Z.
  > >Best Regards,
  > >Mitch
  > >W4COX
  > >   ----- Original Message -----
  > >   From: Paul Manuel
  > >   To: <mailto:amps@contesting.com>amps@contesting.com
  > >   Sent: Wednesday, January 19, 2011 8:11 AM
  > >   Subject: [Amps] 572Bs
  > >
  > >
  > >
  > >   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 reasonable price? What is the final concensus on Chinese
  > > vs Russian tubes? Thanks!
  > >
  > >   73, Paul K4PDM
  > >
  > >
  > >
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