Re: Coil behavior

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "S&JY" <youngsters@xxxxxxxxxxxxxxx>

Glen,

Surprising as it may seem, you can add an external inductance in series with
your primary with only an insignificant decrease in overall efficiency.  Try
adding a few turns of, say, #8 insulated wire around a 4" piece of PVC in
series with your primary.  This is called an "off axis" coil, because
usually you don't want it magnetically coupled to your primary or secondary.
--Steve Y.

----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Saturday, October 21, 2006 10:11 PM
Subject: Coil behavior


> Original poster: "Glen McGowan" <glen.mcgowan@xxxxxxxxx>
>
> Hello All,
>
> I'm afraid to ask but I think I may be lacking in primary turns. I'm
> running a resonate coil (poor planning on my part). That said I'm
> running very conservitave spark gap settings. One of the issues I'm
> running into is I have my tap connected to the very end of my primary
> (15 turns counting the tap lead). I dont' get streamers at any other
> position but the one I just mentioned. If I connect to turn number 14
> I get nothing. I do notice however that my safety gap (Terry's
> Filter) fires solidly at turn 14 and any other turn for that matter
> and no streamers. The safety gap fires quit frequently even at
> primary turn 15 but more pronounced at 14. ( I just realized
> I  should prolly open up the safety gap a hair while proof reading my
post.).
>
> My question is can I adjust anything besides adding extra turns to
> the primary? Can I use a smaller toroid, raise/lower the secondary or
> raise/lower the topload? I really don't want to re-build the
> primary.  JavaTC says I should be tuning at 13'ish turns. I tried 13
> and get nothing but a safety gap arc. I know I'm doing something wrong.
>
>
> Transformer: 15/60
> Primary: 15 turns of 1/4 copper tubing.  (including Tap lead.)
> Secondary : 4" and 23" of actual coil on a 25" form. (first turn
> level with primary, maybe a hair above)
> Toroid: 4x19 sitting at 25" high.
> MMC:  .0093uF  (Ya I know I'll build another one)
>
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