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In the Forum: Audio Discussions
In the Thread: Valve Technology Timeline
Post Subject: The Proliferation of Tube TypesPosted by Romy the Cat on: 5/30/2009
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Here is a very good article about the development tube types in the 1920 and the birth of my Telefunken RE-604

 http://www.goodsoundclub.com/PDF/ProliferationTubeTypes.pdf

 Then, here is very cool later but still old advertising from Telefunken, there is certainly an interesting “class” in thie ad:

The Cat

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