Re: [TCML] Clarification sought on transformers

[Mddeming@xxxxxxx]

Hi Steve,
 
Here are some newbie-clues to good transformers:
 
 1)   The more popular brands in the US are  Franceformer, Jefferson, 
Magnetek, Allentown, Actown, and Transco. Of these,  Franceformer has a reputation 
for being the electrically "sturdiest", although I  have used all brands 
successfully, and over the years, at different times,  have also managed to destroy 
all brands. ;^)
2) Most of the neon transformers good for TC work fall into the 20 to 70 lb  
weight class and are at least 10 years old.
3) They usually have a "rating plate" on them that will specify secondary  
voltage, current, and frequency. For a beginner, you want one rated 9 kV to  15 
kV and current of 30 mA to 120 mA. Be sure to note if the input is in the  
110-120 V range or 220-240 V range. Also check for 50-60 Hz ( Older models  may 
be marked " 50-60~". )
4) If you shake it, it should not rattle. Slightly chipped insulators are  
probably OK, cracked ones are not.
5) If you remove the top cover, there should not be any large, visible  
cracks in the "tar". Tiny "air-bubble" marks or scratches on the surface are  OK.
6) Take an Ohmmeter with you. The DC resistance from each HV terminal to  the 
ground terminal should agree with each other within 5%, and should range  
from a few k-ohm for larger transformers to the 10 k-ohm range for smaller  ones.
 
This does not guarantee a good, working transformer, there may be other  
problems that won't show up until you put power to it, but it's a good  screening.
 
Hope this helps,
 
Matt D.
 
 
In a message dated 2/19/08 10:37:09 A.M. Eastern Standard Time,  
shobley@xxxxxxxxxx writes:

Hi,

I've been reading the list and noticed that there seem to be  'good' and 
'bad' transformers for Tesla coils. I know someone with a neon sign  shop, and 
he's got a bunch of old transformers laying around. What should I be  looking 
for? 

...and more importantly, how can I measure it?

BTW  - Big thanks to Dr Resonance for starting me out on the correct path 
last  night - thanks for the phone  call!

Steve
www.stephenhobley.com







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