Re: primary coil material / design

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: John <guipenguin@xxxxxxxxx>

for a 4" diameter coil powered by 12kv 30mA transformer   will 1/4 
inch copper tubing be ok? someone said something about 1/8 inch but 
that seems to small.

On 10/6/06, Tesla list <<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx> wrote:
Original poster: <mailto:FutureT@xxxxxxx>FutureT@xxxxxxx

In a message dated 10/5/06 11:41:08 PM Eastern Daylight Time,
<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx writes:

John,

My TT-42 coil, and my old research coil both used wire rather
than copper tubing.  The TT-42 uses solid 10awg insulated telephone
ground wire.  The research coil used fine stranded 12awg PVC
insulated wire.  Both were close wound.  Works fine for a small
coil.  Because modern coils usually use a large number of turns
in the secondary, they also need more turns in the primary.
This reduces the peak primary currents and permits a thinner
conductor to be used.

    <http://hometown.aol.com/futuret/page3.html>http://hometown.aol.com/futuret/page3.html 


John



>Original poster: John <<mailto:guipenguin@xxxxxxxxx>guipenguin@xxxxxxxxx>
>
>Hello I am in the middle of building my first coil. I am going to be
>using a 4" diameter for the increased inductance.
>
>I see everyone uses copper refrigerator tubing.... but is there any
>reason (Besides being hard to tune!) to use something like this:
>< 
http://img82.imageshack.us/my.php?image=dcfc0002ud6.jpg>http://img82.imageshack.us/my.php?image=dcfc0002ud6.jpg
>
>I made that test coil just for this email, it isn't enough turns, but
>its just for demo. Why would this be a bad choice?
>
>
>Thanks,
>
>    John.