I fried my precious 15/60 back in the 90's. I melted the tar in a
charcoal-fired BBQ and poured off the melted tar, then soaked the hot
carcass in paint thinner. A VERY, dirty, smelly, laborious operation I
would not wish on anyone I like. It ultimately succeeded, and I re-potted
the repaired NST in melted Vaseline jelly, so if I had to do it again, it
would be easier. Having expended such effort, I took a serious interest in
protection networks. I now preach the gospel of "setting your safety gaps
correctly."
Regards, Gary Lau
MA, USA
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On Fri, Nov 30, 2018 at 9:16 PM Steve White <steve.white1@xxxxxxxxx> wrote:
> 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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