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Re: flashover

Hi, Just a quick question: You are using a pointed discharge terminal?
Otherwise voltage will build up where you wish it did not. I would use the
5" tube clost to the secondary, can't explain the physics, but in my
experience insulating the secondary vs the primary seems most sucessfull.
10 KV DC, what size filter cap are you using? Got some deadly joules


David Trimmell

On Mon, 2 Oct 2000, Tesla list wrote:

> Original poster: "Herwig Roscher" <herwig.roscher-at-gmx.de> 
> Hi coilers,
> I am about tuning my CW, DC driven VTTC = Vacuum Tube Tesla 
> Coil. V plate = 10 kV, primary coil = 36 turns of AWG 7 stranded 
> wire on 6" form, secondary coil = 1300 turns of AWG 26 on 4" 
> form, toroid 1" x 5"
> Today the secondary was hit for the 3rd time by a flash from the 
> primary, starting under an angle of about 45 deg from the 
> uppermost turn. Luckily the secondary was not fried, but in order to 
> avoid this, I'm about to rewind the primary to a 8" form.
> Now my question to the experienced coilers:
> To protect the secondary furthermore, I'm intending to add a PVC 
> or acrylic (appearance) tube between the two coils. I could use a 5" 
> tube (wall 0.15" thick), which is closer to the secondary or a 6" 
> tube (wall 0.18" thick), which is closer to the primary. Which 
> solution would protect my secondary best taking into consideration 
> the E-field distribution?
> Thank you for your advice,
> Herwig