Hello Dan,
It is most likely that the secondary is shorted. Since the shunts will limit the current, the NST will work at 120 volts with a normal current draw and hum but will not put out much on the secondary.
Steve White
Cedar Rapids, Iowa
----- Original Message -----
From: "Daniel Kunkel" <dankunkel@xxxxxxxxx>
To: "Tesla list" <tesla@xxxxxxxxxx>
Sent: Friday, November 30, 2018 8:48:26 AM
Subject: [TCML] Fried NST
Previously on the TCML, episode "Adventures in SRSG"...
> I finally got my SRSG online tonight...
> ...I think I fried an NST or two...
I had a chance to diagnose last night and found that one of my 15/30
Franceformers did indeed die in the sacred duty of the coil. It is odd
though, I apply 120v and it hums like it is working, it won't draw and arc
anywhere...so I ramped up the power with a variac and at 120v my DVM only
showed 280v on the secondaries (I forgot to check each HV leg to ground
though). I am guessing this indicates some turns on the primary melted and
shorted together. Furthermore, I am assuming there are no quick
fixes...great...now I have a reason to attempt my first depotting...is this
still the most current/best method?
https://www.pupman.com/listarchives/1999/April/msg00182.html
So back to a vacuum quenched gap for now.
Thanks,
~Dan (taken down a few notches on the KVA scale)
Kansas City area
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