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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