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R E K

@anders @neauoire I'm currently building a page with resources (still not done), but if you want to do some research on your own, these tubes have many names:
Solar Vacuum Tubes, Solar Evacuated Tubes, and Solar Collector Tubes.
If you append "oven" to that you should find some other write-ups on it.

2 comments
Anders Thoresson

@rek @neauoire Excellent, thanks! Never seen something like this before, but seems genius!

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