R: [TCML] Tiny VTTC

["mazzilli vladimiro" <vladmiro.mazzilli@xxxxxxxxxx>]

Hi Jeremiah, You can try to wind the same number of turns for the
feedback coil, spaced from the tank coil by 1/2 inch. Bias resistor for
screen grid can be 10K 10W, then you can choose a grid leak resistor in
order to have a plate current which meet the datasheet of the tube.
The grid leak capacitor can be 1nF, then you can adjust the tank
capacitor for max out voltage. If you have no oscillations, you must
reverse the connection of grid or tank coil.

An example of this coil is here


http://www.pupman.com/current/vladi2/Tinytube_rev02.pdf

And some ohotos here

http://www.pupman.com/current/vladi2/index.html

Vladi


-----Messaggio originale-----
Da: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] Per conto
di tesla popp
Inviato: lunedì 25 gennaio 2010 3.33
A: Tesla Coil Mailing List
Oggetto: [TCML] Tiny VTTC


I would very much like to construct a Tesla coil with a tube I already
have.  The tube is a 6DQ6-B.  It is a 770 volt, 18 watt beam pentode
tube.  

The datasheet is here:
http://pdf1.alldatasheet.com/datasheet-pdf/view/117732/GEC/6DQ6B.html 

I looked for about an hour online trying to find a coil with simple
schematics for a tube like this, but to no avail. 

Using the "WinTesla" program, I designed a coil which I could feasibly
make based on the materials i have on hand 

Secondary 1" wide x 4.5" tall.  36 AWG wire.
1/4 wave Frequency: 1.45MHz
Toroid will be a 1/4" x 1.5" steel washer. 

Primary coil 1.7" wide, helically would coil.
15 turns of 20 AWG wire.

Capacitor .0120 uf


Things i am not experienced enough to figure out alone are as follows: 
What sort of biasing resistors should i use.  Is there a similar
schematic of a coil using a tube this small?  how many feedback windings
do i need?  What distance from the primary coil i should begin winding
the feedback coil?  what other questions should i really be asking?

I have NEVER used a tube before with success.  Any help would be greatly
appreciated. 

thanks for your input.  I'll post lots of pics in return for your help
if i get it working.


,Jeremiah Popp


      
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