Yes, very good information, thanks for the post.
Mike, K6BR
-----Original Message-----
Thanks for the update John
Carl
KM1H
----- Original Message -----
From: "John Lyles" <jtml@losalamos.com>
To: <amps@contesting.com>
Sent: Friday, July 25, 2008 4:40 PM
Subject: [Amps] European Tube sources
> For the record here:
> Both Thompson and Amperex are still making glass tubes. Not all of the
> glass tubes, but the more profitable glass tubes. For instance, you can
> still buy 3-500Z from the Amperex Covimag factory in France. It was owned
> for a while by Richardson I believe, but it appears to be independent now,
> however Richardson does depend on this factory for product. We just bought
> some, they are used in one of our pulse amplifiers, and we had tried PRC
> tubes and gotten horrible quality for our first sample, so I avoid them
> now. See http://amfone.net/Amforum/index.php?topic=6841.0.
>
> Thompson is now Thales, and still makes their tubes in the same factory in
> Thonon les Bains. I have visited it numerous times, last in March, and
> seen tubes with glass envelopes still being made - less of them though.
> They are having difficulties getting skilled glass makers (an art as well
> as skill) and getting enough glass tubing from suppliers too. Some of
> their HV pulsed modulator tubes, used in CAT scan machines for example,
> are being discontinued. Its unfortunate because for serious HV (like >100
> kV) glass excels over most ceramic insulators. Thales also bought the
> Telefunken production as well as some of Seimens and the ABB high power
> line. All of these are now produced in the same factory, which helps them
> make these devices more economically.
>
> Last week I took home a pair of brand new matched 3-500Z in cartons, from
> the estate of a SK. They are marked matched, having paperwork stating
> such, and they have PRC stamps on them. Someday I will find out if they do
> indeed work that well, but right now I have good Eimacs in sockets in my
> Powerock 314R1 as well as an SB220.
>
> 73
> John
> K5PRO
>
>> Message: 3
>> Date: Fri, 25 Jul 2008 09:27:49 -0400
>> From: "Carl" <km1h@jeremy.mv.com>
>> Subject: Re: [Amps] Tube sources
>
>> Svetlana is still made in Russia or one of its ex republics AFIK.
>> Amperex/Thompson production Im not sure about. All other glass tubes are
>> Chinese no matter the brand name, no more USA. Taylor has a big logo with
>> San Marcos CA under it. Then on the side is the date code with PRC right
>> under it looking like part of the code. A real con job from RF Parts.
>>
>> ------------------------------
>>
>> Message: 8
>> Date: Fri, 25 Jul 2008 16:29:57 +0200
>> From: "Peter Voelpel" <df3kv@t-online.de>
>> Subject: Re: [Amps] Tube sources
>
>> Amperex stopped glass tube production.
>> A glass factory in Northern Germany were using 4-400B tubes from them as
>> voltage regulators for there magnetron generators.
>> When the tubes got unavailable they diverted to 8877, just needed to
>> exchange the socket.
>> For about 3 years they use now Chinese 8877 in about 50 generators
>> without
>> any trouble, unfortunately for that reason I could not obtain pulls so
>> far.
>> (but a couple of 4-400B with sockets and chimneys).
>> They paid 400 Euro/tube in that quantity.
>>
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