Re: Secondary Output Current

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Bob (R.A.) Jones" <a1accounting@xxxxxxxxxxxxx>


Hi Chris,

> Original poster: "Chris Fanjoy" <zappyman@xxxxxxxxxxx>
>
>    What determines the current output of a VTTC secondary, anyway?
> The reason I ask is becaused I discovered something last night while
> working on my coil. I was finally starting to get some decent output,
> but the secondary started arcing to the grid feedback winding. So I
> moved the grid winding down the form, closer to the primary winding.
> It seemed to solve the arcing problem, but I noticed something quite
> remarkable; the output sparks were now very thick and hot - similar
> to that of an oil burner transformer. Output current, by my guess,
> would be around 20mA if not more - no doubt very deadly to come in
> contact with!
>    So does the spacing between the primary and grid windings, have
> something to do with the current output?

It may depend on your mode but in general the grid winding should be mounted
as close as possible to the primary so that it has the maximum coupling to
it.
Hence the grid feedback voltage is determined by the primary voltage and not
the secondary which is the most efficient configuration.
i.e. the valve gets turned on at the positive peaks of the anode voltage.

Presumably your sparks became more powerful because the output power
increased.
Though its also possible the mode of operation changed and that just helped
one thick one form as opposed to several thin ones.

>A thinner arc would be
> preferable for looks, and no doubt somewhat safer to be working with.

Its unusual the have some one ask how to decrease there power output if that
is the problem.
Just increase your grid leak resistor. Thats proabably something you should
be adjusting for optimum performanc in any case.


Robert (R. A.) Jones
A1 Accounting, Inc., Fl
407 649 6400
>