Re: My PT is loud!

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

Original poster: "Alex Crow by way of Terry Fritz <twftesla-at-uswest-dot-net>" <user-at-alexcrow.clara-dot-net>

I'd be very careful if I was you. You're probably either saturating your PT 
by running it *way* above rated voltage (which will make it start to consume 
vast amounts of current and get very hot, and, yes, vibrate - possible 
explosive danger) and/or (because you are feeding just a cap from the HV) 
getting some kind of resonance.

I don't think your PT will live much longer at over twice rated Vin. I'd 
either get another one, or try to cope with the low voltage - it is possible 
to run a coil this low, just a bit harder.

Cheers,

Alex

On Wednesday 21 February 2001 15:06, Tesla list wrote:
> Original poster: "Drew Murray by way of Terry Fritz <twftesla-at-uswest-dot-net>"
> <drewallmighty-at-hotmail-dot-com>
>
> Hello,
> I am almost finished my coil. I took everyones advice and redid my primary.
> I don't want to risk cooking my secondary with the Vertical helix primary.
> I have finished winding my 8" x 32" pvc secondary. I gave the pipe a thin
> coat of poly before i started winding. I didn't have much left in the can
> as i used it for my last coil. I have all of the current limiting and power
> control equipment set up for the PT and i have been having fun watching the
> heat waves totally distort the wall behind it from my jacobs ladder. It can
> climb untill the flame is something like 5" long. Anyway,
> I have been experimenting with around 323 1 gallon zip lock bags with the
> zip locks cut off, and some foil plates, trying to make a capacitor. I
> noticed that if i got the capacitance way too high, and i turned up the
> variac to the pt, no sparks would jump the 1/2" saftey gap on the pt. It
> worked with a 16 wine bottle salt water cap! When i turned it up to around
> 60% A really loud buzzing/humming noise would come from either the PT or
> the capacitor, which i have watched vibrate voilently before. It would stay
> loud until i turned everything off. What the heck is happening here? It is
> a 120:4200  -at- 1000va, but i have been feeding 300v into it from a step up
> transformer, so i can get 10500v out of it. 4200 just wasn't enough. and
> could somebody show me how to get the right size capacitor with my zip lock
> bags and aluminum plates? I really need to know this.
>                                                        The Young coiler
>                                                         Drew Murray
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