[time-nuts] beryllium oxide

Robert Atkinson robert8rpi at yahoo.co.uk
Sat Aug 1 19:16:58 UTC 2009


The british military marking for BeO is a pale blue color. Normally a paint spot but I've seen insulators that were tinted blue.

Robert G8RPI.

--- On Sat, 1/8/09, Dave Baxter <dave at uk-ar.co.uk> wrote:

> From: Dave Baxter <dave at uk-ar.co.uk>
> Subject: Re: [time-nuts] beryllium oxide
> To: time-nuts at febo.com
> Date: Saturday, 1 August, 2009, 7:24 PM
> Many high power TWT's (traveling wave
> tubes) use it at the collector end, for thermal coupling to
> the baseplate, or heat disipator.   They will
> be marked up accordingly, with a BeO sticker, or a "Do not
> cut open" warning.
>  
> Also, some high power RF semiconductors use it, though many
> modern examples use alumina ceramic. (I think that's what
> it's called.)
>  
> We have several scrap TWT's and "Buckets" of scrap QRO
> semi's here at the salt mine, that we just can't dispose of
> as a result.  Thankfully, they don't take up much
> space.
>  
> Regards.
>  
> Dave Baxter.
>  
> 
> ________________________________
> 
> --------------Original Message----------------
> 
> Message: 10
> Date: Fri, 31 Jul 2009 22:41:17 +0100
> From: "Dr. David Kirkby" <david.kirkby at onetel.net>
> Subject: Re: [time-nuts] beryllium oxide
> To: Discussion of precise time and frequency measurement
>         <time-nuts at febo.com>
> Message-ID: <4A7364FD.9020304 at onetel.net>
> Content-Type: text/plain; charset=ISO-8859-1;
> format=flowed
> 
> Dr. David Kirkby wrote:
> > Marco IK1ODO wrote:
> >> Robert,
> >>
> >>> Some power tubesmay use it internally.
> >>
> >> As far as I know, from many discussions with power
> tube manufacturers,
> >> no power tube uses beryllia, except for that
> conduction-cooled Eimac
> >> tubes. It's simply not needed.
> >> Other tubes (not power ones) may be different, but
> I never heard of
> >> any beryllia in them.
> >>
> >> Marco IK1ODO / AI4YF
> >
> > I believe some of the bases for the conduction cooled
> tubes use BeO too.
> > I might be wrong on this. I have a few sitting in the
> garage somewhere.
> >
> > I doubt there is any point having it inside
> air/water/vapor cooled tubes
> 
> 
> Sorry, just realised I replied to something written
> ages  ago.
> 
> 
> 
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