Re: [TCML] Capacitor Questions

[johnbrooks@xxxxxxxxxxx]

MY first TC used a cap from an OLD, TV. Popular Electronics,,long,,long
time ago..
Joe in Texas

On Tue, 26 May 2009 19:48 -0700, "Bob Deuel" <k2glo@xxxxxxxxxxxxxx>
wrote:
> Hello:
> 
> I have questions regarding a couple capacitors that I have:
> 
> 1) The first capacitor is a Sprague type 45P5 "Vitamin Q" rated at 0.012
> mfd. @ 25,000 VDC. It physically measures approximately 2.5-inches in
> diameter and 6.5 inches long with end caps threaded for 1/4-20 thread. It
> is an oil filled capacitor that has a glass cylinder with metal end caps.
> I understand that some capacitor dielectrics do not take kindly the
> rigors of Tesla Coil operation and overheat. I wondering if anyone has
> used a capacitor of this type? This one would use for a future coil if it
> is acceptable.
> 
> 2) I plan on building a table top coil using a 5kv @ 20 ma. NST soon. I
> keep looking at a capacitor that is on my bench that I believe was from
> an older IBM computer monitor. It is made by ERO and is
> 9000pF+80-20%/20KV. It actually measures 10,300 pF which is great.
> Physically, it is potted unit in a 1.5x1.75x2.75 plastic case with a
> insulated HV lead and a "ground" lead. Are capacitors like these
> acceptable for a small coil or should I forget it and go with a MMC?
> 
> I would appreciate your input on the feasibility of these two capacitors.
> 
> Thanks,
> Bob Deuel, K2GLO
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