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[TCML] Re: VTTC schematic for 813

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.  

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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