Utilities
Fivre tube box

Picture of constructional details of a duo-diode triode indirectly heated tube from "Inside the vacuum tube" by J..F. Rider 1951. A nice Windows® wallpaper or a good picture to put near your work bench for well impressing visitors. Click on the preferred format to download file.

Wallpaper 1024x768 172kb

Wallpaper 800x600 138kb

Wallpaper 640x480 166kb (few better resolution to preserve reading)

A4 Full size 1.26Mb (top resolution)

   
A collection of symbols for drawing schematics with MS Paint. Found in the web, don't remember where, reported as found with copyright *.txt file 376kb
   
4 stand alone utils for getting better pictures in few seconds.
   
DjVu Solo 3.1 Install this and make your Djvu files.