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The 1st generation of radio technology was probably similar to the 1st generation of automobiles. Many small makers, eventually narrowed down to just several major companies. Which probably means that you may not be able to find a schematic. But odds are Daven followed a conventional design, likely a reference design created by the tube companies. Here, a "reference design" was a design created by the tube engineers to demonstrate circuits that would make the tubes work well, to help their customers like Daven get the most out of the tubes. The tube manufacturer wants happy customers. I used to do stuff like this ten years ago in Silicon Valley working for a small fabless analog chip company.
If you can't find a Daven schematic, look at other brands of radios that uses the same or similar tube line-up.
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