A few months ago I was working on a 100w led power supply that failed and found a black disc thing that had popped and looked up what it was and found that it was a inrush protector. I wasn't familiar with them but thought they would be great for a soft start for filaments in tube amps. I checked them out at Digi-Key and found they had them that got into the 100's of amps and a wide range of resistance ranges. Haven't try them yet but hope to get around to it this winter.
Happy New Year,
Stan
________________________________
From: Gary Lau <glau1024@xxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Saturday, January 3, 2015 9:38 AM
Subject: Re: [TCML] NTS Thermistors - Was: Hairpin circuit tripping breaker....
Yep - just put one in series with the Variac input terminal. But they WILL
get hot (I**2 R = 20x20x.015 = 6Watts or more), and you want them to (so
they acquire the minimum hot-resistance), so you probably want at least a
small segment of lead-length, to put some thermal resistance between the
disk and any heat-sinking input stud. I don't know about combustible, but
you don't want anything melt-able too close.
Regards, Gary Lau
MA, USA
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