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Re: [TCML] 810 tube coil



Can you share photos?

  --G

--
Typed on tiny keyboard

> On Dec 14, 2017, at 7:41 PM, Chris Reeland <chrisreeland@xxxxxxxxx> wrote:
> 
> Might also be a dumb question, but did you check the mica cap or maybe
> caps. Even though they may check all "good" on say a LCR Meter, still could
> be bad. I also have limited equipment for some things, but I have recently
> got a "10 mega, mega" ohm meter to check some of my mica cap collection.
> Got some checking bad, they are leaking too much...
> 
> Just another thought from a VTTC guy...
> 
> Chris
> 
> Sent from my LG
> 
>> On Dec 14, 2017 7:30 PM, "Futuret via Tesla" <tesla@xxxxxxxxxx> wrote:
>> 
>> Dave,
>> 
>> 
>> If you're using the voltage doubler (level shifter), then you should
>> get 16" sparks like Steve got.  Does the plate of the tube get dull
>> red if it runs awhile?  This might be seen more easily in a dark room.
>> If the plate gets red then it means the tube at least is capable of
>> strong emission.  Even without the doubler it should produce 11"
>> sparks.  However the coil will need to be tuned differently for
>> high power vs. low power operation to adjust for the
>> capacitance provided by the spark length.  Is the 810 tube known
>> to be strong and good?  A weak tube will give weak sparks, and
>> the plate will never get red (or probably won't).  If you used JavaTC
>> or some other program to tune the coil, you may need to use a 50%
>> larger capacitor than the program suggests to adjust for the
>> capacitance of the spark.  I think JavaTC might have a feature
>> that takes spark capacitance into effect (I forget).  If it does then
>> that can be used.  But it still might need to be tuned a little
>> differently.  Also Steve might be using a step up type variac
>> which can provide up to 140 VAC to the coil.  That makes a
>> large difference in spark length compared to using just 120 VAC.
>> An easy way to check the tuning is to install different sized
>> toroids (or no toroid), and see if the sparks get weaker or
>> stronger.   Here's my website where I show a smaller VTTC project.
>> 
>> 
>> https://sites.google.com/site/jfuturet/home
>> 
>> 
>> John
>> 
>> 
>> 
>> -----Original Message-----
>> From: David <zipo@xxxxxxxxxxx>
>> To: tesla <tesla@xxxxxxxxxx>
>> Sent: Thu, Dec 14, 2017 3:54 pm
>> Subject: [TCML] 810 tube coil
>> 
>> Hello everyone - I have completed my first tube coil using a 810 triode
>> based on Steve ward's 810 coil outlined here,
>> http://www.stevehv.4hv.org/VTTC4.htm
>> I've almost exactly copied his design but with mica transmitting caps.
>> I've been working with trying to tune primary turns and adjusting grid
>> coil height and turns and have been getting ~4" sparks from the breakout
>> point, I would have expected more.
>> I'm not using a staccato yet but how much should I expect from a coil
>> like this at 60Hz?
>> 
>> Thanks
>> Dave
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