[Amps] 572Bs

Wed Jan 19 14:57:57 PST 2011

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 at bigpond.com>Alek Petkovic
>To: <mailto:amps at contesting.com>amps at 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 at contesting.com>amps at 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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