http://tubedepot.com/jttcoat.html?utm_source=newsletter3&utm_medium=email&utm_ca mpaign=Spring_2009

OK. It's cool for us geeks. They disect a 6L6 tube.

Maybe some of the "normal" folks may enjoy it too!

Very cool.

Of course, if you work around high power tetrodes and pentodes of the RF variety, don't be attempting disassembly or allow yourself to come in contact with the ceramics (found in e.g. near the output waveguide in a microwave tube or around the cathode in a typical high output RF tube for radio/tv broadcast) or breathe any dust coming off the ceramics ... the beryllium oxide can kill you.

http://books.google.com/books?id=DSHSqWQXm3oC&pg=PA2215&lpg=PA2215&dq=rf+tube+ha zard+beryllium+oxide&source=bl&ots=o_KUEQGJ8P&sig=l7LpNrBT9CuyF6FjFU3I8pY1LeU&hl =en&ei=d__DSZ2yF4HasAPR4cn3Bg&sa=X&oi=book_result&resnum=1&ct=result#PPA2215,M1

Yes it will.

We had 250 watt VHF paging transmitters that ran a 4CS250R for the final. It had a beryllium oxide flange on it that held it against the heat sink.

SOP was if you dropped the tube and the flange broke, leave the room.

Nasty stuff.

I had a professor friend of mine tell me that if you ever wanted to "do someone in" you could sprinkle a tablespoon of the dust into their carpet and it wouldn't be too long before they were pushing up daises!

That substance also is dangerous in the shop. Must be water jet, not laser cut.

I love tubes. Nice video!