[Amps] Non-vacuum capacitor

[Steve Bookout]

Hello all,

My wife has a woman working for her at her art gallery that is also an experienced 'glass artisan', or whatever the name is, and I asked her about working with the glass vac variables.
She thinks the biggest issue may be not knowing the specific glass composition you would be working with.  The problem is the coefficient of thermal expansion, between the original glass and any glass tube (for re-evacuation) you try to melt to the capacitor.

She has the high BTU output torch and skill working with glass, which are two things I don't have.  If I can find a vacuum cap that has lost it's vacuum, she is willing to give it a try.  And, we have an sneaking oven, as well.

Does anyone have any mfgr documentation that may indicate anything abt the glass used (e.g. '... Using the highest quality Boron-Manganese glass...')

73 de Steve, NR4M



On Apr 27, 2013, at 16:06, Chris Wilson <chris at chriswilson.tv> wrote:

> 
> 
> 
>>> There is apparently already an air leak. This kind of damage only gets
>> worse
>>> with time.
> 
>> Sorry, I should have made that clearer. The damage happened a long time
>> ago, so it is already up to 100% of atmospheric pressure. It will still
>> hold off 3kV DC.
> 
> 
>> 73 from Ian GM3SEK
> 
> 
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> 
> 
> 27/04/2013 21:03
> 
> Quite why they don't have a means of checking or re-evacuating these
> things I don't know. Some sort of port would be nice, given the price,
> even if you needed fairly specialised gear. One can look at new old
> stock and not have a clue if it is evacuated to OE spec, or near
> atmospheric in there. I have some Edwards high vac pumps and want at
> my Jennings :)
> 
> -- 
>       Best Regards,
>                   Chris Wilson.
> 
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