Can you share photos?
--G
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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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