>What's wrong with the existing CRT? Lost it's vacuum? Open-circuit
>heater? Inter-electrode shorts? If none of those, you should be able to
>get something on the screen with it?
The protective layer is delaminating from the tube.
>I would guess the P39 is the screen phosphor (IIRC that's a common green
>phosphor). Similar CRTs with a different phosphor should work.
Yes it is the phosphor type. Since the tube is from a vector graphics display
(my Imlac), I think that it needs the long persistence properties of the P39.
I did locate (using google) the company
http://www.questinc.com which has
a P4 replacement CRT and can also remanufacture the existing tube. If I
recall, P4 is a white phosphor isn't it? How does P4 compare to P39 for
persistence? I don't have prices yet, but I am interested in the remanufacture
possibility, if the risk is not too high. The tube is mostly useable as is,
but the corners are getting a little anoying...
>I wasn't aware Conrac made their own CRTs (I've only come across monitors,
>etc made by them). So it may be a specially selected part (for some
>performance characteristic), but otherwise be a standard CRT. You might
>find another CRT that will at least work reasonably well in this unit.
>
>How much do you know about it (dimensions, deflection angle, pinout,
>heater voltage, other electrode voltages?)
It is a 15" diagonal (10"x13") and about 16" from the face to the end of
the neck. Here is a picture of the tube electronics:
http://www.ubanproductions.com/imlac_monitor.jpg
--tom
Received on Tue Aug 21 2001 - 15:16:00 BST
