Re: [TCML] Tuning Questions

[futuret@xxxxxxx]

 Charlie,

I think 14" from an OBIT is quite good.  I got 13" from one, using a couple of mica
caps of small value... only 0.0015uF total.  I tried resonating the OBIT with a larger
cap and got 25" sparks, but the OBIT was destroyed within a few seconds.
That's why it's good to use LTR value caps.  

You can run your 6kV plate transformer from a step up type variac to get 7kV.
You'll need some sort of ballasting for the plate transformer, either inductive
or resistive.  Yes, the lower voltages need larger cap values in general, but
you can try the lower cap value and the system with just run at a higher 
break rate with more current.  You may need a fan blowing on the gap to
cool it.  Depending on how much you ballast the xfrmer, that's how much
current you'll get.  

John

 


 

 

-----Original Message-----
From: cbroring@xxxxxxx
To: tesla@xxxxxxxxxx
Sent: Sun, Feb 14, 2010 10:31 pm
Subject: Re: [TCML] Tuning Questions 


John 
 
Thanks for the reply and I enjoyed reading the "Efficiency Theory" section of your web page.  I ran my coil through JAVATC, which I probably should have done before I built it,  and the model says my coupling was in fact too low.   I modified the primary with state of the art Popsicle stick and glue gun technology to make it adjustable in height.  I adjusted the coupling even tighter and found no further gain in streamer length but did find tuning to be much less critical, so I left it that way.   This is very much like tuning my ham radio transmitters and antenna couplers. 
 
Streamer length is greater then 14 inches which is a lot less then JAVATC suggests.  However from what I read, an OBIT may pass less power then it's rating suggests.  Any comments on this performance from a single OBIT and salt water bucket capacitor? 
 
I have another OBIT on the way to add in parallel whit the one I have.  I also dug out an old 6000 volt ct. 1kva+  radio plate transformer that I may try.   I'm a bit concerned about  the relatively low voltage of this plate transformer.  I thought the low voltage/ higher current of such a supply may also necessitate making another big messy bucket capacitor.   Any comments on using this bigger transformer are very welcome. 
 
Charlie 
 


 
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