Re: Again with the forms?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Terry Fritz" <twftesla-at-uswest-dot-net>

Hi,

	Recent testing I have done indicates that using Sonotube over something
much better in my big coil may cause the arcs to be maybe 1/2 to 1 inch
shorter (45 inch arcs).  So even thought Sonotube is very high loss
compared to some things, the added loss is nothing to worry about.  I would
not use it in high power CW coils however,

Cheers,

	Terry


At 09:43 AM 1/13/2001 -0500, you wrote:
>In a message dated 1/12/01 9:47:13 PM Pacific Standard Time, tesla-at-pupman-dot-com 
>writes:
>
><< Original poster: "Barton B. Anderson by way of Terry Fritz 
><twftesla-at-uswest-dot-net>" <tesla123-at-pacbell-dot-net>
> 
> Hi Shad, 
> 
> I agree totally. I'm glad you posted this. Often times we nit-pik and to new
> coilers it can be confusing. PVC and sonotube are both low cost and have been
> used for many years with great success. There have also been a few failures -
> let's not forget that either. But, the success rate far out-weighs the 
>failures
> and with the low cost makes both of these formers good to use. 
>  >>
>> Original poster: "sundog by way of Terry Fritz <twftesla-at-uswest-dot-net>"
>> <sundog-at-timeship-dot-net> 
>>
>>  Hi all, 
>>
>>  Does the dissapation of the secondary really matter?  I use 
>1/4"thickwalled 
>> PVC 2" pipe with my small test coils, and have seen no difference between 
>it 
>> and thin PVC.  I really can't justify the expense of an acrylic tube for a 
>> big coil, where the power input is magnitudes greater than a small coil 
>> (10kva polepig vs a 15/60NST?)  Sonotube has been proven to work well, so 
>> long as it's dry and well-prepared. 
>
>Hi Bart, Shad,
>I, too, am in agreement with both of you regarding the type of materials
>chosen for the secondary form. I have had great success with both PVC
>and cardboard formed secondaries as well as a few failures. Yes, every 
>material exihibits some losses in the presence of the Tesla generated
>RF, some more than others. Even air itself poses some minute losses!
>But the bottom line is that most of the form materials of choice will give
>acceptable results, providing that they are reasonably free of moisture.
>Usually, failure mode is attributed to other short comings in the circuit 
>design than the choice of  sec. coil form material (i.e. improper tuning,
>overcoupling, ect.). And as Shad mentioned, the differance in the output
>vs the sec form material is usually undetectable. So if you can't tell the 
>differance, why pay the differance. Hum, that sounds like a shampoo 
>commercial :-)
>
>Keeping 'em Sparkin' in Memphis,
>David Rieben
>