RE: [TCML] VACUUM CAPACITORS

["Michael Creigh" <creigh@xxxxxxxxxxx>]

Yeh, the largest I have found on ebay is up to 1200pF but this is only for
4kV. I think the parrallel idea for fine tuning is a really good one.

Regards,
 
Michael Creigh
 
-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of piranha
Sent: Thursday, 30 October 2008 7:50 AM
To: Tesla Coil Mailing List
Subject: Re: [TCML] VACUUM CAPACITORS

The stand off voltage for a hard vacuum is also about 1,000,000 volts 
per inch!  Although the capacitance is low, they are ultra expensive 
new, and they are big and heavy, they are almost a perfect capacitor.  
Very high voltage (~15kV) and very high RF current (~500 amps RF).  They 
are even expensive on Ebay!

Piranha



Ed Phillips wrote:
> DC Cox wrote:
>
>> perhaps only for a very small vacuum tube coil.
>>
>> main reason is the capacitance is usually too low and the units with 
>> higher
>> capacitance are very large physically.
>> this is due to the fact they use only air as their dielectric.
>>
>> Dr. Resonance
>>
>>
>>
>
> Actually vacuum as the dielectric, but since air and vacuum are 
> essentially the same dielectric constant, the comment still holds. 
> Physically large for the amount of capacitance, compared to something 
> with a solid dielectric."
>
>    True but, compared to air dielectric capacitors, "vacuum 
> capacitors" are much smaller for the same capacitance and voltage 
> rating.  Very expensive gadgets requiring extreme care in 
> manufacturing and outgassing.
>
> Ed
>
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