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" <[email protected]> Subject: Re: [time-nuts] beryllium oxide To: Discussion of precise time and frequency measurement <[email protected]> Message-ID: <[email protected]> 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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