Hi Mike,
I want to add to John's reply.
The screen connection of this tube also can be utilized with a separate
dedicated power supply.
Also going from memory of this 813 tube, there is also a beam forming
connection there, which again would be best utilized by a separate
dedicated power supply if I am correct here.
That said, me personally, I would not be trying to use this type of tube on
a VTTC.
Unless you have something else in mind for this VTTC besides "sparks" in
addition to?
I would try to stick to simple triode tubes.
Chris Reeland
Ladd Illinois USA
Sent from my LG V20
On Sun, Sep 19, 2021, 11:01 PM Futuret <futuret@xxxxxxx> wrote:
> Mike,
> I had built a VTTC some time ago in which I experimented with
> using various tubes such as the 810, HF300, and also an 813. the 810 or
> the HF300 produced a 21" spark output. the 813 gave a 16" spark. I tried
> it with the control grid tied to the other grid. I also tried it with the
> other grid fed through a dropping resister from the HV power transformer.
> It gave 16" in both cases. My guess it that with further optimization it
> would probably have given a 21" spark like the other tubes. Although these
> tubes were probably rated for around 2 or 3 thousand volts DC on the plate,
> I fed them with around 3200 volts AC on the plate. The schematic was just
> the basic type VTTC schematic which is very commonly used. I also used a
> 140V output step up type variac to power the VTTC.
> John
>
> On Thu, Sep 16, 2021, 10:09 PM MIke Widlar <mike@xxxxxxxxxx> wrote:
>
> > I'm new to this forum. I currently looking to see if anyone has a
> > schematic
> > for a VTTC using a single 813 power tube. I had this working previously,
> > but I could only pull a 2" spark off it. I pulled the setup apart and
> > packed everything up. Now I'm ready to put all the pieces back together
> > again and get something going. I have also secured a 2500 DCV plate
> source
> > which I can draw at least 400ma.
> >
> > If someone could provide some guidance it would be greatly appreciated.
> >
> > Regards,
> >
> > Mike
>
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