HP CRT mould update

[Vintage Computer Festival]

On Sun, 17 Apr 2005, Jules Richardson wrote:

> > Are you certain it was a mold eating at the sealant
>
> Actually, there was no obvious mould as such on this one - it seemed
> more like the sealant had turned to liquid in some places (visible as
> 'puddles' behind the glass), whilst in others it seemed to have
> crystalised into small hard lumps (giving the visible white spots)
>
> So, no sign of visible mould - I wonder if the dark spots sometimes seen
> are maybe some form of optical effect; trapped bubbles as you say rather
> than being something physically dark in colour.

The HP300 at the Computer History Museum has the same "mold" effects, as
does a 2648 I've got in my warehouse.  HP CRTs (especially the elongated
ones found on the mentioned machines) seem to be more typically
susceptible to this effect than other CRTs.  I wonder what it is about
them?

-- 

Sellam Ismail                                        Vintage Computer Festival
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International Man of Intrigue and Danger                http://www.vintage.org

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