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Forums
4hv.org :: Forums :: Tesla Coils
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My First Tube! :D

 1 2 3 4 
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m4ge123
Tue Jul 03 2012, 01:35AM
m4ge123 Registered Member #4118 Joined: Mon Oct 03 2011, 04:50PM
Location: MD
Posts: 140
An old laptop power supply sounds great for this, if you don't have interference problems.
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Killa-X
Tue Jul 03 2012, 01:57AM
Killa-X Registered Member #1643 Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039
I was lucky to find a vintage tube transformer on ebay rated 12V for my 12V filament. Otherwise I would have just removed the secondary out of a MOT, and wind my own until it readed 20V during load...
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Sulaiman
Tue Jul 03 2012, 03:24AM
Sulaiman Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
how about a series resistor with a 24V ac transformer?
R=(24-20)/3.5 = 4/3.5 = 1.14
P=V.I = 4 x 3.5 = 14W

Something like this Link2
with this Link2
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Thomas W
Tue Jul 03 2012, 05:53PM
Thomas W Registered Member #3324 Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
really... good... point sulaiman ^~^
thanks
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2Spoons
Tue Jul 03 2012, 10:24PM
2Spoons Registered Member #2939 Joined: Fri Jun 25 2010, 04:25AM
Location:
Posts: 615
And if you use the right value NTC resistor you get soft-start as well!
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PhilGood
Wed Jul 04 2012, 11:10PM
PhilGood Registered Member #3806 Joined: Sat Apr 02 2011, 09:20PM
Location: France
Posts: 259
Hi Tom,

I found this one on a french retailer Link2

Maybe you can find a similar one with 110V primary from a UK retailer ?
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Thomas W
Thu Jul 05 2012, 09:20AM
Thomas W Registered Member #3324 Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
hehe ive just brought a 160VA 30v-0 30v-0 torroidal transformer from ebay im gonna rewind
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PhilGood
Thu Jul 05 2012, 10:56AM
PhilGood Registered Member #3806 Joined: Sat Apr 02 2011, 09:20PM
Location: France
Posts: 259
Tom Williamson wrote ...

hehe ive just brought a 160VA 30v-0 30v-0 torroidal transformer from ebay im gonna rewind
Nice ^^ Can't wait to see your coil !
I'm also planning to build a GK-71 based VTTC, it seems to be a really cool tube cheesey
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Thomas W
Thu Jul 05 2012, 11:35AM
Thomas W Registered Member #3324 Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
well, this is my first coil, im gonna use litz wire instead of normal wire or copper strips,

a quick question: VTTC H-Bridge?
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PhilGood
Thu Jul 05 2012, 11:52AM
PhilGood Registered Member #3806 Joined: Sat Apr 02 2011, 09:20PM
Location: France
Posts: 259
Tom Williamson wrote ...

well, this is my first coil, im gonna use litz wire instead of normal wire or copper strips,

a quick question: VTTC H-Bridge?
First VTTC, or first Coil ever ?

I don't get your question ... afaik Half/Full Bridges refer to SSTC's, sorry I'm still new to all this stuff, what are you thinking to exactly ?

The one I'm planning to build is a base fed HFVTTC with a classic plasma speaker circuit powered with a full wave rectified MOT, something like RateReducer's Coil
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