Re: [TCML] Should I repot this NST?

[Sfxneon@xxxxxxx]

Steve,
 
It's so old that a lot of the asphalt spirits have dried up caused  the 
potting to shrink. It could leave voids in critical areas, but it might  not remelt 
too well now either. The asphalt also contains a lot of silica flour  that 
may restrict it's flow even more. I'd just use it as-is and depot it if it  
fails. Otherwise, remove as much of the rust on top as you can so it doesn't get  
mixed into the rest of the potting compound and slowly heat it to see if it 
will  flow enough to close up the cracks. Meanwhile, look for another NST for a  
back-up.
 
Tony Greer
*************

In a message dated 9/19/2008 7:25:21 P.M. Central  Daylight Time, 
shobley@xxxxxxxxxx writes:
I got hold of a 12kv 60ma NST from  a local sign company. It's pretty old
and the potting is a bit cracked, as  you can  see:

http://www.flickr.com/photos/20929480@N03/sets/72157607383559345/

It  passes the "arc to case" test on both sides without any issues, but I
was  wondering if I should repot/remelt this?

I almost cranked up the grill,  but then I read how you can overcook the
potting on towards the base if not  careful.

I did melt some of the bigger cracks closed with my 'pocket  blowtorch'.

Steve
 



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