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 rumor states, but I have certainly
had no trouble obtaining them when needed.
----- Original Message -----
From: Al Kozakiewicz
To: amps@contesting.com
Sent: Wednesday, January 19, 2011 6:01 PM
Subject: Re: [Amps] 572Bs
I thought the Svetlana tubes were long out of production?
Al
AB2ZY
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Alek Petkovic
Sent: Wednesday, January 19, 2011 5:58 PM
To: amps@contesting.com
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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