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Re: [TCML] VTTC grid/secondary coils
Hi Simon,
I'm not exactly sure of write and wrong other that write means sparks
and wrong means none. But, for what it's worth, all of my coils (pri,
sec, grid) are wound in the same direction. For the grid coil, the top
of the grid winding is attached to ground through a 5K resistor and the
bottom of the grid winding is attached to the tubes grid.
http://www.classictesla.com/photos/vttc/vttc-023.jpg
It sounds like just a matter of swapping the grid leads. If that doesn't
work, there is probably some rudimentary error in the wiring.
Take care,
Bart
On 8/26/2012 9:14 PM, Simon wrote:
So long story short - i made some recent changes to my vttc coil concerning the primary circuit and grid coil. The changes i made were:
Changed the tank capacitance from 5nf to 2.5nf and thus increased the number of primary turns (and the diameter by about 1/8"). I also rewound the grid to match the new primary diameter.
Ive made plenty of changes like this and have been able to get things working one way or another so i dont think its the "stats" of the coil causing a problem. The only variable i can see is the physical winding direction of the grid is NOW the same as the secondary. In all other setups it has been wound opposite. Is this a problem??
I havnt tried rewinding the grid yet, but i have tried everything else and still no sparks, not even a "feedback" hum from the variac.
Things ive already tried:
I had an analog ammeter in series on the grid coil after the capacitor before ground and wasnt reading anything anymore. Ive switched all the leads going to the primary and grid. Checked along the secondary with a neon light. Physically flipped both grid and primary coils. Tried various tap points and slight changes in coupling values for the coils. Ive checked the frequencies with an O-scope and assuming i did that right everything is as close as it ever was. Ive taken voltage measurments all over the circuit and things seem right.
Thanks for thoughts.
Simon
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