Image Map Image Map
Page 1 of 3 123 LastLast
Results 1 to 10 of 27

Thread: Commodore PET 2001-8C with blue phosphor screen?

  1. #1

    Default Commodore PET 2001-8C with blue phosphor screen?

    Hi gang, after buying a PET 8032 the other day, I decided to dig out the other PET I have had in the attic for ages.

    Turns out it's a PET 2001-8C, in quite nice shape except for the front label missing:



    It turns on and shows a more or less expected garbled screen. I'll get to fixing it later, but for now I wondered about the blue phosphor screen. I usually see white or green, but this is distinct blue. It doesn't turn to white when turning up contrast. Photos of low and high contrast settings, high contrast might seem white-ish, but in real life it's very blue:





    Anybody know if there's anything special about this?

  2. #2
    Join Date
    Jan 2012
    Location
    Connecticut, USA
    Posts
    2,268

    Default

    I call shenanigans on this post? Blue phosphor CRT on a pet 2001? Hogwash I say!

  3. #3

    Default

    Please take a picture of any label on CRT, that might shed some light on what that actually is.

    Frank

  4. #4

    Default

    Off hand it will have a P11 phosphor.

    Blue was not that uncommon for some CRT's for photographic applications, it has a shorter persistence than green (P1) or white (P4). It is relatively rare though for an electromagnetically deflected CRT, most CRT's I have with P11 are scope style electrostatic CRT's.

    So the CRT type is likely "somethingP11", or possibly a P5 phosphor.

    Here is a good phosphor list:

    http://www.bunkerofdoom.com/tubes/cr...r_research.pdf


    (The other options to explain it, it could be a color CRT with the blue gun on , but I cannot see a dot pitch style phosphor in the photo, or a hoax/shenanigans as suggested by VERAULT in post #2 , with say a blue filter in front of a P4 white CRT, but I think not, and that suggestion might impune the OP).

    If this is a blue CRT in the PET as it appears, then its super cool in my opinion.

  5. #5
    Join Date
    Oct 2008
    Location
    Kamloops, BC, Canada
    Posts
    5,778
    Blog Entries
    44

    Default

    Sanity check. Is this a regular CRT with a blue filter in front of it? Something about the images seems off to me.
    = Excellent space heater

  6. #6

    Default

    It doesn't even look that real to me. Clear, square pixels don't come from CRTs. CRT faces aren't that flat. Blue CRTs don't generate both blue and cyan on a PET.

  7. #7

    Default

    Quote Originally Posted by NeXT View Post
    Sanity check. Is this a regular CRT with a blue filter in front of it? Something about the images seems off to me.
    There is perhaps a tiny blue glow from the screen filter. So its either a white CRT behind a blue filter or a blue CRT behind a clear filter, but the OP could tell right away just by shining a torch at the filter.

  8. #8

    Default

    Screenshot_20190928-230024.jpg

    That's not a CRT.

    But the forum won't show enough clarity in my image so you'll have to zoom in for yourself.

  9. #9

    Default

    It fills me with joy that shenanigans are considered a possibility in the world of microcomputer enthousiasts! But I can asure you, not pulling anyone's leg here.

    I see I posted the wrong link for the first photo, but I can't edit my post (nor see the photos myself, nor see my replies as I'm new to the forum...)

    So here's more photos: https://pixelambacht.nl/dump/pet/2001-8c

    Here's one photo of the PET:



    You can see the blue gloss on the screen when the computer is turned off. It looks like there's maybe a blue layer in front of the screen -- I didn't mean to imply the phosphor is actually blue. I called it that to distinguish between the "blue monitors" that this version has, with blue plastic instead of actual blue screen.

    Anyway, I hope these extra photos shed some light. The PET is back in the attic but I don't mind taking extra pictures.

  10. #10

    Default

    Quote Originally Posted by KC9UDX View Post
    Screenshot_20190928-230024.jpg

    That's not a CRT.

    But the forum won't show enough clarity in my image so you'll have to zoom in for yourself.
    I'm still of the opinion for now that the OP is genuine with the post, who would make a hoax out of the notion of a blue CRT in a PET ?

    Also when I look closely at the photo, in the areas that are very bright I can see definite scanning lines with the usual spaces between them, typical of a monochrome CRT.

    So I think it's either a genuine (rare) blue CRT, or a white CRT with a blue filter over it.

    But, if I have been fooled, it's a very strange joke.

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
  •