Fairlight-CMI

Hi Peter,

This is interesting info. What would happen if you would use a slightly
acidous basin (plastic baby tub ?) and leave the tube partially suspended
in it, face down on three or four small pieces of wood to have the bottom
exposed for a fair time while warming the acid from time to time ?

My intuition would say it will slowly dissolve the resin and the lense
would come off.

However, why was the extra glass added in the first place ? Radiation ?
impact protection ?

What caused the bubbling ? resin deterioration or fungal growth maybe ?

A brave man you are :)

Regards,
Harald.

> Many early I, II and IIX monitors I've seen have been affected by age
> and possibly contamination that results in the screen image becoming
> cloudy, and difficult to see clearly. I picked up a monitor that was
> so bad as to be unusable, so embarked on a "kill or cure" operation.
> I discovered that the CRT screen actually has a thin piece of glass
> like a contact lense, bonded to it with a thick layer of adhesive
> resin (both the contact lense and the resin layer are about 2mm thick
> each). After carefully removing and supporting the tube, I gradually
> worked a sharp knife into the resin gap between the two bits of
> glass, with the idea of removing the contact lense in one piece.
> Unfortunately, the edges seemed to come away easily, whereas the
> screen centre was stuck solid. End result: contact lense cracked.
> Pushing on anyway, I eventually broke off the rest of the bits by
> prising with a screwdriver, cleaned the front with alcohol and re-
> assembled. The screen now looks good as new. However, before you
> attempt this yourself, heed these safety WARNINGS. Firstly, CRT tubes
> having a vacuum inside contain a huge amount of energy. If you break
> one, the potential for grief is great. Also, there are voltages in
> the tens of thousands of volts needed to form that lovely green
> image, and some of this remains even when the monitor is
> disconnected. If in doubt, get a TV repair person to look. It's not,
> as we say, the science of the rocket....
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