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Registered Member #3114
Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 608
I got this small Francformer NST from a friend, previous use unknown(probably wasn't messed with just remove and sat on a shelf to collect dust). I wanted to make a small Tesla coil but I found that the arc it was supposed to create was only a millimeter long. :( Is it trash? Anything i can do to fix it ?
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
can the bottom be unscrewed and removed? my Franceformer needed a new switch, now works fine. but if you cant gain access to the internals in may be crap.
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
There are many documentations in the Internet about how to restore damaged NSTs. If the wiring is ok essentially you have to melt the tar, mix it a bit to destroy possible carbon tracks inside and let it cool again. Obviously something messy to do. Try to measure the resistance of the secondary winding. There are two coils with the center grounded (jn the case, I imagine). If you measure two identical resistances the wiring is at least not open. You can also check the short-circuit current. 9 kV should produce sparks with at least 3 mm.
Registered Member #4341
Joined: Sun Jan 15 2012, 07:09PM
Location: UK
Posts: 3
Secondary's almost certainly shorted... depotting these things to fix them is an absolute pain in the arse, so unless you really can't get hold of another I'd say it's not worth the bother.
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Weak NST output
