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4hv.org :: Forums :: Tesla Coils
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My first SGTC (AKA the Howlin' Mad Murdock SGTC MarkI)

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HV Enthusiast
Mon Sept 13 2010, 03:30PM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Thats good output to start. This was with the 9kv/30ma transformer?

Have you tried adjusting tuning or coupling yet?

Without much work, you should easily get at least 12" arcs, so they do seem a bit short.

I would make sure your tuning is okay (start tapping by moving 1/8" turn at a time etc...)

And also check spacing of the spark gap. If the gap is too closely spaced, the voltage won't build very high and will limit your output.
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HM_Murdock
Mon Sept 13 2010, 03:46PM
HM_Murdock Registered Member #3075 Joined: Fri Aug 06 2010, 02:44PM
Location: Athens, GA
Posts: 148
Yep, 9kV/30mA NST...

And just to clarify, you are saying the tuning on the primary should be adjusted in 1/8" segments on the coil (I did not know it was that sensitive)?

I have tried playing with the coupling and tapping (with extremely limited experience doing so), and that is the best I have gotten so far. Spark gap is set pretty narrow (about 4mm), because my safety gap fires off if I go wider. May need to re-assess my safety gap setup.

Basically, I set up the safety gap by adjusting it about 1/2mm wider than it will arc with just the NST hooked up to it.
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HV Enthusiast
Mon Sept 13 2010, 07:15PM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Actually, i meant 1/8 of 360 degrees.

Set your safety gap for the open circuit voltage of the NST and then widen it up a little bit more.

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HM_Murdock
Mon Sept 13 2010, 07:17PM
HM_Murdock Registered Member #3075 Joined: Fri Aug 06 2010, 02:44PM
Location: Athens, GA
Posts: 148
Define "a little bit more"?

That's what I did ( I believe), but I don't know if I went enough?
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