1930's DeForest 569 Mercury Vapor Rectifier

I think this is more of a product announcement rather than an advertisement. The tube structure is very interesting. I'll have to keep a look out for the 569.

This post originated at retro vintage modern hi-fi http://itishifi.blogspot.com
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IMPROVED THREE-WAY CROSSOVER BY LARRY KLEIN April 1958

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Garrard 301 Transcription Turntable Ad