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mra1 | 14:08 Tue 27th Aug 2013 | Crosswords
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Last one - am at my wits' end here - 21 ac Amplifying electron tube ?L?S?R?N - I had thought electron at first but the S is correct being Hammerstein of Rogers and that ilk - have googled it, tried every conceivable question to Wikepedia and can come with nowt - Help please!
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Klystron
Klystron

noun - an electron tube used to generate or amplify electromagnetic radiation in the microwave region by velocity modulation
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Thank you Captain2!

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