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RE: [TCML] Toroid Problems



Nicholas,
     If I had to guess I would say adding your toroid threw your coil so badly out of tune that you ran out of primary.  You might try adding some more tank capacitance and re-tuning, otherwise your power level may just not be quite enough for such a "large" toroid.

Scott Bogard.

> Date: Mon, 4 Aug 2008 12:37:56 -0500
> From: ngoble@xxxxxxx
> To: tesla@xxxxxxxxxx
> CC: 
> Subject: [TCML] Toroid Problems
> 
> Last night, I fired up my coil for the first time.  I set everything up
> and made sure that all the connections were solid.  When I plugged the
> NST in, the spark gap fired, but there were no sparks coming from the
> toroid.  I tapped the entire primary, but got no streamers.  At a few
> points, the safety gap was firing, so I guessed that the caps were
> working.  I thought that the only thing that could be wrong was the
> toroid.  When I disconnected the toroid and ran the coil, I got
> streamers and some corona coming from the tip of the secondary wire.  I
> was able to tune the coil without the toroid.  I got 5-6 inch
> streamers/sparks from the wire.
> 
> Here are the specifications for my toroid:
> 4" height
> 17" outer diameter
> 9" inner diameter
> I took two flimsy 9" pie pans and glued them together.  Then I wrapped 
> 4" aluminum dryer duct tubing around it and secured the ends together 
> with duct tape.  I secured the tube's connection to the base with caulk 
> on the rim of the pie pans.  I took some aluminum foil and wrapped it 
> around the duct taped section, and connected that to the base (pie 
> pans) with more duct tape.  I drilled a hole in the middle of the pans 
> and attached a nut and bolt.  I sanded off most of the enamel of the 
> end of the secondary wire and secured it to the middle of the toroid 
> with the bolt.
> 
> My secondary is 4" dia and 21" tall.  I'm using a 9/30 NST.  Can anyone 
> diagnose my problem?  I dobut that my toroid is too big.  If anything, 
> I thought it would be too small.  I used a nail to create a breakout 
> point on the toroid while it was running and it still failed to produce 
> streamers.  What's the problem?
> 
> Thanks
> 
> Nicholas Goble
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