Image Map Image Map
Page 3 of 3 FirstFirst 123
Results 21 to 23 of 23

Thread: Anyone know what this Vacuum tube is for?

  1. #21
    Join Date
    Jan 2007
    Location
    Pacific Northwest, USA
    Posts
    27,024
    Blog Entries
    20

    Default

    Actually, radar was the driving force behind a lot of computer tech.

    I remember being tempted by some surplus head-per-track drums that John Meshna (remember them?) offered that were surplus aircraft items--400Hz motors and all. I almost sprang for one when a friend who had worked on these things opined that they most likely had numerous defects in the surface.

    The 1960s CDC IGS 200 used long-persistence radar CRTs. I recall seeing one of the IGS folks fooling with one--the color of the drawing spot was different from the color of the afterimage.

  2. #22

    Default

    Was it long persistence, or a storage tube? I recall seeing storage tubes in CAD terminals that had storage tubes with that feature. I don't recall what the two colours were, but the normal bright image during screen drawing was a different colour than the resulting image.

  3. #23
    Join Date
    Jan 2007
    Location
    Pacific Northwest, USA
    Posts
    27,024
    Blog Entries
    20

    Default

    Not a storage tube--a long persistence phosphor. Blue when writing, yellow-green persistence (P-7 phosphor).

    The CDC Digigraphic 270 series, a 22 inch flat-faced round CRT.

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •