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Forums
4hv.org :: Forums :: Tesla Coils
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811a coil questions

 1 2 3 
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Adam Munich
Wed Aug 10 2011, 01:43PM
Adam Munich Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
Nah wrote ...

I don't understand how you can send $9 to ship something that is less than a pound.

They don't. Some seller charge 35 shipping and 10 for the product.
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Patric
Thu Aug 11 2011, 08:43AM
Patric Registered Member #2899 Joined: Wed Jun 02 2010, 06:31PM
Location: Deinze, Belgium
Posts: 255
I start the transformer for the filament with a capacitor of 2 µF in series, and when the filament is warmed up, I put the transformer straight on 220V.
But how can I regulate the power of the Tesla cheap and easy? Two steps is enough.
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Nah
Thu Aug 11 2011, 02:42PM
Nah Registered Member #3567 Joined: Mon Jan 03 2011, 10:49PM
Location: USA, 1960s
Posts: 260
Use 300 watt light bulbs as a ballest.
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Patric
Fri Aug 12 2011, 03:44PM
Patric Registered Member #2899 Joined: Wed Jun 02 2010, 06:31PM
Location: Deinze, Belgium
Posts: 255
I use now a transformer from 48V in series with the microgolf transformer, but would like a triac-regulator to regulate the power. Nobody?
Here is a picture of the working coil at lowest power:
1313163844 2899 FT121748 Teslafrog
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Nah
Fri Aug 12 2011, 05:17PM
Nah Registered Member #3567 Joined: Mon Jan 03 2011, 10:49PM
Location: USA, 1960s
Posts: 260
Why would you want to lower the power? What voltage is your B+?
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Patric
Fri Aug 12 2011, 08:06PM
Patric Registered Member #2899 Joined: Wed Jun 02 2010, 06:31PM
Location: Deinze, Belgium
Posts: 255
Nah wrote ...

Why would you want to lower the power? What voltage is your B+?

2100V, But my tube is slightly glowing red...
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Nah
Fri Aug 12 2011, 10:32PM
Nah Registered Member #3567 Joined: Mon Jan 03 2011, 10:49PM
Location: USA, 1960s
Posts: 260
It's fine. It'll last at least another hour of run time. If you do want it with no red, upgrade to 572B or use several 300 watt bulbs as ballests.
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Patric
Sat Aug 13 2011, 10:36AM
Patric Registered Member #2899 Joined: Wed Jun 02 2010, 06:31PM
Location: Deinze, Belgium
Posts: 255
Nah wrote ...

It's fine. It'll last at least another hour of run time. If you do want it with no red, upgrade to 572B or use several 300 watt bulbs as ballests.

Thanks, but I will keep my 811 a little longer, and a more elegant solution for the power regulation.
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Nah
Sat Aug 13 2011, 03:14PM
Nah Registered Member #3567 Joined: Mon Jan 03 2011, 10:49PM
Location: USA, 1960s
Posts: 260
Use a small MOT as a ballest?

I have some high power heating elements I can send to you for shipping.
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Patric
Sun Aug 14 2011, 05:43PM
Patric Registered Member #2899 Joined: Wed Jun 02 2010, 06:31PM
Location: Deinze, Belgium
Posts: 255
Nah wrote ...

Use a small MOT as a ballest?

I have some high power heating elements I can send to you for shipping.

Thank you very much, it is very kind, but I use a 48V transformer in series with the m-transformer (in anti-phase).
What I want is a tension I can regulate and that is small: with a triac!
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