Re: [TCML] Condenser Products capacitor and Sprague Doorknob capacitors relisted

[Ed Phillips <evp@xxxxxxxxxxx>]

OK - reason for question was the difference in stud size.  I hadn't 
gotten around to trying mine before reading of other guys' problems and 
wonder about firing them up after all these years.  I thought the 
problem was internal and independent of whether they were lying on 
something conducting.  Will encase one in something more or less 
explosion proof and give ti a try on a12 or at most 15 kV NST.

dfroula@xxxxxxxxxxxxx wrote:

> Hi, Ed,
>
> No, the Condenser Products cap I have is NOT from the ones from the group buy that some had issues with.
>
> Although the part number is the same as the ones in the group buy, this cap was manufactured after. The physical difference is the diameter of the threaded stud connections, which is smaller on this cap than those on the group buy.
>
> The original issue was that the dielectric strength of the PVC housing is only 10KVAC (as clearly stamped on the housing), although the voltage rating on the cap itself is 20KVAC.
>
> When the cap is run over 10 KVAC without proper insulation between the cap housing and the floor or other object, the breakdown in the cap housing would cause destruction of the cap.
>
> It is recommended that the cap be run inserted into another piece of PVC tubing for additional insulation if it is lying against the floor, plywood, or near another conductive surface.
>
> Don
>
> --- On Thu, 1/17/13, Ed Phillips <evp@xxxxxxxxxxx> wrote:
>
>  
>
> > From: Ed Phillips <evp@xxxxxxxxxxx>
> > Subject: Re: [TCML] Condenser Products capacitor and Sprague Doorknob capacitors relisted
> > To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> > Date: Thursday, January 17, 2013, 5:10 PM
> > I hope these aren't the same ones we
> > bought several years ago and which 
> > tended to explode!  Anyone recognize them?
> >
> > Ed
> >
> > dfroula@xxxxxxxxxxxxx
> > wrote:
> >
> >    
> >
> > > Due to buyer's remorse, the Condenser Products and
> > >      
> > Sprague doorknob caps are relisted:
> >    
> >
> > > http://www.ebay.com/itm/140907062567?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649
> > >
> > > http://www.ebay.com/itm/140907062371?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649
> > >
> > > =============================================================
> > >
> > > Condenser Products capacitor, specifically designed and
> > >      
> > manufactured for pulse-discharge Tesla coil operation.
> >    
> >
> > > Brand new and never used. Shorting wire still in place.
> > >
> > > Ideally suited for a 1/4 wave Tesla coil design.
> > >
> > > .025 mfd, 20,000 VAC
> > >
> > > Manufacturer:   Condenser Products
> > >
> > > Part Number: TC253-34-300 ("TC" stands for "Tesla
> > >      
> > Coil")
> >    
> >
> > > Voltage: 20,000 VAC RMS
> > >
> > > Capacitance: .025 mfd, +- 10%
> > >
> > > Dimensions: 4.5" diameter x 13.5" long
> > >
> > > End Stud Electrical Connections: 3/8"-16 x 1"
> > >
> > > Pulse Ratings: 60Hz, 120 PPS, 100KHz - 500 KHz ringing
> > >      
> > (conservative ratings)
> >    
> >
> > > Amps Peak: 65,000
> > >
> > > Max. Current (RMS): 120A at 120 Hz, 100A at 10KHz, 75A
> > >      
> > at 100 KHz, 50A at 500 KHz, 42 A at 1 MHz
> >    
> >
> > > Case Material: Thermoplastic tubing (PVC)
> > >
> > > Weight: ~ 20 pounds
> > >
> > > *** Shipping to US addresses only, excluding Alaska and
> > >      
> > Hawaii.
> >    
> >
> > > ====================================================================
> > >
> > > Lot of 8 - Sprague .004 mf, 30 KV doorknob capacitor
> > >
> > > Threaded stud on one end, mating threaded receptacle on
> > >      
> > other side - Permits easy ganging for increased voltage
> > capability.
> >    
> >
> > > Excellent for Tesla coil protective bypass capacitors.
> > >
> > > New, old stock, unused, untested
> > >
> > > _______________________________________________
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> > > Tesla@xxxxxxxxxx
> > > http://www.pupman.com/mailman/listinfo/tesla
> > >
> > >
> > >  
> > >
> > >      
> > _______________________________________________
> > Tesla mailing list
> > Tesla@xxxxxxxxxx
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> >
> >    
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>
>
>  
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