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Re: No Terry filter

Original poster: "Gerald  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

Hi David,

If you could answer the following questions, I might be able to help you:

1. Designed targets for Ballast inductance (mH, line current, and operating voltage 120,140,240,280).
2. Number of ballast turns, cross sectional area core, winding length top to bottom.
3. Core geometry with dimensions, and lamination geometry
4. Measured line current when failed.
5. Variac output voltage when failed.
6. Cp value.
7. Type and make of capacitor and its Vdc, Ipeak, Irms, and voltage reversal ratings.
8. String length and number of strings in parallel (Cp array).
9. How were the safety gaps set?
10. Was the TC tuned at low variac voltages? Was the SRSG adjusted at low variac voltages?
11. TC primary inductance (from JAVATC or equivalent).
12. Where in the cycle were you firing at when the failure occured.
13. Do you have a scope with HV probes??

Gerry R.


Original poster: "david baehr" <dfb25@xxxxxxxxxxx>


A couple weeks ago I tried substituting my static gap with a SRSG with not so good results, safety gap fired as much as the main gap , and, took out a cap. This was after much adjusting,...my coil just didnt like it,....any ideas ??( My coil is powered by a single bushing 1.5kva pig with a homemaded gapped inductive ballast)

>>I've had good results over the years too without any safety
>>filters.
>>My old research coil with the 12/30 NST, then later the TT-42
>>coil never ruined any transformers provided I used a SRSG.
>>Even the use of resonant sized cap values did not destroy
>>the NST's provided that an SRSG was used.
>>The static gaps were prone to destroying the NST's despite
>>shorter output spark lengths.  I do use safety gaps however.
>>In SRSG use, they never fire however.  They're there in case
>>something else fails.
>>
>>John
>>
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