2 May
2005
2 May
'05
4:35 p.m.
On Mon, 2 May 2005 18:55:08 +0100 (BST)
ard at p850ug1.demon.co.uk (Tony Duell) wrote:
The CRT on a Mac Plus is probably one of the easiest video tubes to
replace. It's nice and small, and it's not many screws to get a Plus
apart enough to swap it. I'm not sure that (used) replacement CRTs are
as plentiful as they were five years ago when I replaced one, though.
There used to be Apple-oriented 'scrap' shops where you could get a
pulled tube for ten dollars.
I have a
Viewsonic PT813 21" CRT monitor, a very high-end
professional model that I was told used to cost $1800 new (1997),
has both DE15 and BNC inputs and supports both PeeCee video and sync
on green. Unfortunately it is malfunctioning - the picture is
smudged to the point of being totally unreadable. It seems like
some component in its circuitry went bad - I don't think it's the
CRT - so it's probably fixable.
A word of warning to anyone who gets this... I had an Apple Mac+ that
had a smeared display -- shaddows to the right of objects on the
screen. Now, the Mac+ video circuit is pretty simple, but
none-the-less I spent quite a time going through it, unable to find
the fault.
The reason I couldn't find a fault in the video amplifier was that
there wasn't one. It was the CRT. Low emission, I think.