CRT mold [was: HP2648 heartbreak]

From: Vintage Computer Festival <>
Date: Sun Feb 13 22:33:59 2005

On Sun, 13 Feb 2005, Bob Shannon wrote:

> When you break the bond between the RTV-like material and the safety glass
> shield, it "looks" very much the same as the mold spots.
> I'm in the process of restoring the CRT for an Imlac that has a very bad
> case of whatever this problem is. It was so bad that sections of the
> clear bonding material could be pulled out from between the CRT face and
> the safety glass. These bad spots have a fine white powdery texture that
> may well be due to mold.
> Using a tool to carefully reach between the safety glass and CRT face
> I've removed sections of the bonding material that were still 'good'. As
> you break the bond and any gas gets between the safety glass and bonding
> material you will see the 'spots' even though the bonding material has
> not taken on that powdery texture.
> It seems that the visual appearance problem is due to a failed bond, no
> matter why that bond failed.

Interesting. This photo is of the Imlac PDS-1 that I have:

If anything, it's gotten worse with time (I haven't looked at it in a
while but I guess I should).

Aside from needing a keyboard (as far as I know they were custom built for
Imlac) I will eventually need to restore the display to get this back to
pristine condition.

Please keep us posted on your progress.

Sellam Ismail                                        Vintage Computer Festival
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Received on Sun Feb 13 2005 - 22:33:59 GMT

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