[TCML] Terry Filter

[huil888]

Jim -

I had wondered about the inductance of large wire-wound resistors when used 
in a Fritz Filter, and initially tried to find some non-inductive resistors 
(monolythic "Carborundom" style) when I was building my filter for my 15/120 
system. However, I was never successful in finding any surplus non-inductive 
resistors with a value anywhere around 1K ohms, so in the end I h=just used 
conventional wire-wound power resistors.

In answer to your question, I measured the inductance of several 1K ohm 
wire-wound resistors that I had laying around (I could not locate my Fritz 
Filter with its 1K ohm/100 watt resistors).

1K ohm 225W 9-1/4" long X 1-1/8" dia 160 micro-henries

1K ohn 55W 3-1/4" long


----- Original Message ----- 
From: "Jim Mora" <jmora at jetlink.net>
To: "'Tesla Coil Mailing List'" <tesla at pupman.com>
Sent: Monday, December 31, 2007 12:40 PM
Subject: [TCML] Terry Filter


> Hello,
>
>
>
> I am curious, has anyone ever measured the inductance of a 1K 100w Ohmite
> resistor? I don't know if they are inductive canceling. The two inch spark 
> I
> got while adjusting my unloaded Terry Filter is still a mystery. The gaps
> were 1/8" each at the time and the center was grounded to the neon and
> mains.
>
>
>
> I am thinking reverse RMF from ramping up the variac too fast???
>
>
>
> Jim
>
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