Red magic eye tube

This is experimental red magic eye tube. As you know, in the world is a lot of magic eyes, but with blue or green luminescent screen. I tryied red phosphor type SPD580. This phosphor is good, because screen is shining very well during anode voltage is 200V.

The parameters of experimental tube:

  • oxide cathode
  • anode voltage 200V
  • resistance in screen 22kOhm
  • filament voltage 1,0 V
  • control electrode voltage 0-100V
  • serial resistance in control electrode (working with external source of signal) 56kOhm
  • resistance in control electrode (working with internal triode) 1-4,7MOhm
  • Grid voltage 0...-2V

     



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