[AMRadio] 572B's going Legacy?


jeremy-ca km1h at jeremy.mv.com
Mon Nov 26 21:24:00 EST 2007


I wouldnt bet on it. Maybe one supplier will bow out but glass tubes is 
still a big business and no self respecting Chinaman will pass up the chance 
to get an American dollar.

Carl
KM1H


----- Original Message ----- 
From: "Jim Candela" <jcandela at prodigy.net>
To: <amradio at mailman.qth.net>
Sent: Monday, November 26, 2007 8:27 PM
Subject: [AMRadio] 572B's going Legacy?


>
>
> Hi all,
>
>  I ran into the following info from another source (yahoo ham_amplifiers). 
> It looks like the Chinese 572B manufacturing may have already ended. That 
> leaves the Svetlana version. see info below.
>
> 73,
> Jim
> JKO
>
>
>
>
>
> pentalab wrote:
>
>> Gents.. this from AMPS. It appears that Chinese 572-B's are no
>
>> longer going to be made... and that the Svetlana 572-B is a dud for
>
>> RF.. I read somewhere that the Svetlanan version is for audio use
>
>> only.. and the anode is smaller inside the glass envelope... and
>
>> also doesn't hi-pot test as high.
>
>>
>
>> Jim
>
>>
>
>>
>
>> Yep, dead right. I buy them in direct from China for resale in
>
>> Australia and can attest to their excellent quality.
>
>>
>
>> There is one downside however. The Shuguang factory which makes the
>
>> tubes has decided to DISCONTINUE the 572B. Stocks have all but dried
>
>> up and there won't be any more. As I write this, the last 22 tubes
>
>> that I could source in China, are on their way to me
>
>>
>
>> There is obviously no money in glass rf tubes. The upsurge in tube
>
>> hifi has seen to that.
>
>>
>
>> 73, Alek
>
>> VK6APK
>
>>
>
>> At 01:49 AM 23/11/2007, jeremy-ca wrote:
>
>>> All Chinese tubes are the same now. All RF Parts does is charge you
>
>>> more for the honor of having their name on them.
>
>>>
>
>>> Ive bought directly from Hong Kong as well as the Pentas, no
>
>>> problems in Clippertons or on 6M.
>
>>>
>
>>> Carl
>
>>> KM1H
>
>>>
>
>
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