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 <d...@uk-ar.co.uk> wrote: > From: Dave Baxter <d...@uk-ar.co.uk> > Subject: Re: [time-nuts] beryllium oxide > To: time-nuts@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.kir...@onetel.net> > Subject: Re: [time-nuts] beryllium oxide > To: Discussion of precise time and frequency measurement > <time-nuts@febo.com> > Message-ID: <4a7364fd.9020...@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. > > > > ------------------------------ > > -----Inline Attachment Follows----- > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.