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[TCML] Re: VTTC schematic for 813

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
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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