Yes, but you can compensate for any tuning changes caused by toroid capacitance changes by adjusting the tap point on the primary coil.
Steve White
Cedar Rapids, Iowa
----- Original Message -----
From: "Adam James" <adamjamesarmy60@xxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Wednesday, January 27, 2021 9:45:20 AM
Subject: Re: [TCML] Topload position
Should I understand then, It is a"trial & error" thing? Move the toroid up
for best performance until I get corona from the top turns, then down
until corona stops?
AJ
On Wed, Jan 27, 2021 at 10:33 AM Steve White <steve.white1@xxxxxxxxx> wrote:
> The top load serves 3 purposes:
>
> 1. Provide capacitance for the secondary circuit
> 2. Provide a smooth surface to build up charge
> 3. Provide EM shielding for the top turns of the secondary coil to prevent
> corona
>
> The toroid should be placed just high enough above the secondary coil to
> prevent corona and discharges from emitting from the top turns of the
> secondary coil. In addition to causing power loss, corona can damage the
> insulation of the top turns. Since toroid height also affects capacitance,
> you may have to re-tune your coil after movement.
>
> Steve White
> Cedar Rapids, Iowa
>
> ----- Original Message -----
> From: "Adam James" <adamjamesarmy60@xxxxxxxxx>
> To: "tesla@xxxxxxxxxxxxxxxxxx" <tesla@xxxxxxxxxx>
> Sent: Wednesday, January 27, 2021 7:37:16 AM
> Subject: [TCML] Topload position
>
> I have viewed hundreds of TC pictures and it has become apparent to me that
> the placement of the toroid in respect to the top of the secondary is all
> over the map!
> so, WHAT determines where the topload should be placed?
> AJ
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