Here you find some stuff about vacuum tubes. Most of this stuff I've found in very old books wich are not longer produced. I created pdf-files, so you can easy download this files for free.
All the informations you find here are only for educational and/or private use! I am not responsible for everything including disasters/deaths coming from the usage of the data/info given here. You use all these informations of your own risk.
You are welcome to download all stuff for free, but don't sell it to other people or use it in a commercial way!
Thanks for reading and have fun!
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freeware.de counts for me.