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Fwd: Re: [TCML] Odd VTTC Streamer Behavior

You mentioned 34" and a 7.35% decrease in sparks. You still gotta remember your throwing way more voltage than the tube is spec'd for at the plate. Your using 2 series mots half wave rectified correct? 31" from a single 833c was unheard of until Cameron Prince wowed us all with his maybe 36" single 833c vttc. Philip, Imho I think your being hard on yourself. 31" is not lackluster. 31" is an extraordinary acomplishment in my eyes. I do like your give me more attitude. It will serve you well. But I am not suprised at all that your having some issues as this system is only been tried by a couple people to my knowledge besides yourself. Keep up the good work and keep sparking.
Garry Neeley

---------- Forwarded message ----------
From: Phillip Slawinski <pslawinski@xxxxxxxxx>
Date: Oct 21, 2008 7:08am
Subject: Re: [TCML] Odd VTTC Streamer Behavior
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>

I'm running a 2nF 12kV Mica transmitting cap. As I can recall the coil has

always misbehaved above 105-120V. The streamers still have that thudding,

but it's snappier like you said. Of course this is in stacatto mode, and

I've tried adjusting the controller to no avail. I did sharpen my breakout

point which helped a considerable amount, but I'm still two and a half

inches from where I was before. [That's a 7.35% decrease, which is

statistically signifigant.] I think the lackluster performance can be

pinned on the changes I made to the primary. When I was getting 34" hits

consistently I had unraveled my 28 turn primary by a about five turns,
but I

did not remove the extra wire, I had it coiled hanging over the side of

VTTC enclosure. When I decided to tidy this up I removed a little of the

wire, wrapped the rest around the form, glued it in place, and then added


I sure hope my tank cap is not going bad, the last thing I need is another

stain on the carpet.

On Mon, Oct 20, 2008 at 22:50, Dr. John W. Gudenas

> wrote:

> Phillip

> I ran into a problem like this and it was associated with the tank

> capacitor starting to fail.

> If I increased the voltage after about 95volts the streamers got smaller

> and "snarpy".

> I wasn't running a staccato controller so like John F. said something

> going bad.


> While not a good idea, in complete frustration, I cranked up the variac

> waited for something to fail.

> I exploded a mica transmitting cap. Nasty mess. If you are running an

> after a run see if they are getting warm.

> All it takes is one bad cap in an MMC. If your coil was running great,

> then it started to run not so great and you didn't change a thing,

> you likely have a failing component or poor connection somewhere. In my

> case it was the tank cap.

> Yours could be different. Good Luck

> John


> John W. Gudenas, Ph.D.

> Professor of Computer Science




> On Oct 20, 2008, at 9:28 PM, Phillip Slawinski wrote:


> I ran it for quite a while today, and I think I made some progress

>> getting back to where it used to be. It's hitting 31.5", and it's

>> a

>> thudding sound while doing so. It does this while running just shy of

>> 105V. If I push it up to 115V or higher the sparks start to make a

>> cracking

>> sound in addition the the thudding. It's also at this point that the

>> sparks

>> start to branch and become shorter.


>> I tried lowering grid resistance and it only results in shorter sparks,

>> and

>> only marginally at that. I'ma little wary to lower the resistance since

>> the accident that marked the end of the good performance I was getting

>> from

>> the coil. I kept turning down the resistance until the secondary

>> through the silicone sealant and ruined my grid coil. Of course, this

>> an extreme case, and foolish at that.


>> I did move the grid coil down to increase the coupling a little and

>> seemed to help.


>> On Mon, Oct 20, 2008 at 21:03, wrote:


>> The throaty popping sound may be a "bad" sound meaning

>>> the coil is not running just right. Some component may be

>>> failing. Or the staccato controller timing may have changed

>>> in some way. The solid thud sound is good, other types

>>> of sounds can be bad. Is it a raspy sound? If so that's

>>> a sure sign something isn't right. Maybe from the high

>>> power operation of the tubes, they became damaged.

>>> Or arcing may have been occuring in the tubes which

>>> can make a popping sound. You can try reducing the

>>> grid resistance to see if it helps. That tends to keep

>>> the voltages in the tube lower and may help. But it

>>> will make the tubes run hotter of course. But it may

>>> be helpful just as a quick test to get an idea of what's

>>> happening.


>>> John



>>> ---





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