Re: [TCML] Terry Filter Resistors

[DC Cox <resonance@xxxxxxxxxxxx>]

I will send you, off-list a copy of my filter.  I use a 2" ID PVC x 12-14
inches long for coilform and usually wind with
PVC covered wire, approx 100 turns.  In series with each lead between the
Terry filter and the sparkgap.

DC

On Tue, Jan 27, 2009 at 4:09 PM, bartb <bartb@xxxxxxxxxxxxxxxx> wrote:

> My point was that the inductance of the resistor does not appear to be part
> of the design (that I'm aware of) as opposed to say using an inductor on the
> hv side of a transformer. I just checked the resistor in question and it
> measured 146mH at 1kHz. What inductance values do you use on the hv side?
> There may be some filtering there going on, but I still don't know if it is
> by design or by accident.
>
> Take care,
> Bart
>
> DC Cox wrote:
>
>> As current moves thru the inductor, the rising magnetic field causes the
>> peak currents to reduce.  It takes a bit of time to produce the magnetic
>> field, and
>> this clamps the peak currents.  Commonly used in series with large Marx
>> generators when testing HV insulators, transformers, etc.
>>
>> Dr. Resonance
>>
>>
>>
>>
>> On Mon, Jan 26, 2009 at 6:28 PM, bartb <bartb@xxxxxxxxxxxxxxxx> wrote:
>>
>>
>>
>>> Hi Jim,
>>>
>>> I've never heard mention of the resistors for LC filtering in the Terry
>>> filter. Given the application and various configurations of the
>>> transformers
>>> and tank C with no change to the resistor, I don't see how the inductance
>>> can play a part in the filtering.
>>>
>>> Take care,
>>> Bart
>>>
>>> Jim Mora wrote:
>>>
>>>
>>>
>>>> The Terry Resistors handle some fair power. Terry selected the Ohmites
>>>> for
>>>> the "small air core inductance they add" to the filter.
>>>>
>>>> Jim Mora
>>>>
>>>>
>>>>
>>>>
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