Re: Early PET fosphor colour

From: Rhialto <>
Date: Sun, 22 May 2022 17:37:03 +0200
Message-ID: <>
On Fri 20 May 2022 at 09:33:48 +0200, Francesco Messineo wrote:
> it indeed was a "P4" B&W CRT, unfortunately, P4 phosphors were made in
> at least 5 different
> formulas, each having different "secondary" phosphorescence.  The most
> common P4 in the '70s
> would glow a bit bluish at increased brightness levels.

I guess that explains the blue effect, since no matter how I look at
various youtube clips, I can't see it as pure white :) Here is another
good example which has a lot of screen-time so to speak: (Permanent Killer Poke Mod
and CRT Spot fix on the Commodore PET 2001).

___ "Buying carbon credits is a bit like a serial killer paying someone else to
\X/  have kids to make his activity cost neutral." -The BOFH    falu.nl_at_rhialto

Received on 2022-05-22 18:00:04

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