[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

RE: [TCML] Tiny VTTC

Hi All,
I have the article too, it uses a 6L6 tube which is a beam power tube typically used for audio. I can also send it along, it is a 5mb file. It used a to die for Miller HV output transformer, no longer available, for the HV.
The 'DQ6 was used in tube TV's for the horizontal oscillator and to drive the flyback transformer for the CRT HV. I built a 50 W ham transmitter using this tube a loooong time ago. As a starving novice, I scrounged tubes from scrapped TV sets and re-wound the power transformer for either a 6 or 12 V filament so I could run either tube. Even some of the small commercial ham transmitters used a pair of them in a push pull configuration.
If someone has some Sams from say the mid 60's, look at almost any TV schematic and you probably will see the HV circuit with a 'DQ6 tube. The earlier sets used a 6DQ6 and the later ones used a 12DQ6. This would be a good start for the circuit. Then wind a coil and experiment with the feedback windings. If you can find the specs on the flyback transformer from one of those schematics, they will give the winding details so you can have a starting point. Remember your TC will not have a ferrite core so the primary turns will have to be adjusted to compensate for that. 

Frank

At 03:34 AM 1/25/2010 +0000, you wrote:
it seems to me that in about 1964, popular electronics had a plan for lil-TC and Big-TC - and the little one used a 6V6 - that woudl be a good place to start - I scanned the article some years back and sent it out to those who wanted it 

> Date: Sun, 24 Jan 2010 18:33:09 -0800
> From: teslas_lab@xxxxxxxxx
> To: tesla@xxxxxxxxxx
> Subject: [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
>
>
>
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla

_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla

_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla