[Amps] 813 top cap cement

[Bill Fuqua]

A thin layer of silicone will not flex much but will have enough give to 
keep stress off of the glass.   If it is only a few thousandths thick how 
much can it compress? Epoxy and other very hard materials not only have no 
give but have quite a different coefficients of thermal expansion than 
glass. So without some give or compression ability in the glue stress may 
be applied to the glass  seal.

73
Bill wa4lav


At 06:26 PM 2/17/2005 -0600, Jim Isbell, W5JAI wrote:
>I would be more concerned about damaging the plate lead because of
>flexing.  If that lead breaks at the glass, it will be near impossible
>to reconnect the cap.
>
>
>On Thu, 17 Feb 2005 18:02:51 -0500, Bill Fuqua <wlfuqu00 at uky.edu> wrote:
> >      RTV  (silicone Cement) works very well. It bonds to glass and metal
> > well and is
> > very resistant to temperature.  Try it sometime. Take a cured glob of
> > Silicone Cement and
> > put your soldering iron against it and see what happens.   Practically 
> nothing.
> >   The point of contact may change color a little bit but that is all. It is
> > also flexible and
> > will not produce strain on the glass envelope.
> >
> > 73
> > Bill wa4lav
> >
> > At 07:53 PM 2/17/2005 -0300, GGLL wrote:
> > >         Which cement could be appropriate to fix the loose top cap in one
> > > of my
> > >813's?. It works very well, the cap has been detached from the glass, but
> > >still in place by means of the plate connection wire.
> > >
> > >TIA
> > >Best regards
> > >Guillermo - LU8EYW.
> > >
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> >
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> >
>
>
>--
>Jim Isbell
>"If you are not living on the edge, well then,
>you are just taking up too much space."
>W5JAI
>UltraVan #257
>CAL - 27   #221