Re: [TCML] Sword like dischare in CW mode, VTTC

[futuret@xxxxxxx]

Hi Jim,

The 7" dia coil which gave 36" sparks, ran at about 100kHZ (?)
It was wound with 28awg wire.  It always gave fuzzy sparks.
The secondary probably had a low Q due to the thin wire.

In one test, I replaced the VTTC secondary with a short 9" x 7" dia
secondary wound with 28awg wire, and retuned.  This gave
spiky sparks.

I did some tests with a 6.5" x 24" secondary wound
with 20awg wire.  I can't remember offhand how the sparks
looked.  I'll have to check my notes.  I was running the coil
using a plate transformer during the test, but I think it would
have benefited from using the 5kVA pig.

In any case I think your coil should work well using the parameters
you mention.

Cheers,
John


-----Original Message-----
From: Jim Mora <wavetuner@xxxxxxxxx>
To: 'Tesla Coil Mailing List' <tesla@xxxxxxxxxx>
Sent: Tue, Jun 23, 2009 8:02 pm
Subject: RE: [TCML] Sword like dischare in CW mode, VTTC


Hi John,

Ah yes, the tubes only conduct like a diode. I forgot about that aspect 
of
the PPS. Out of curiosity, what was the Res Freq of your 7" coil and the
~impedance? Do you remember? I am planning a 6"x24" arcylic with a 
larger
gauge wire, maybe 22awg, and a aluminum 7" rounded plate top 
shield/load.

Thanks as Always,
Jim Mora

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On 
Behalf
Of futuret@xxxxxxx
Sent: Saturday, June 20, 2009 11:58 AM
To: tesla@xxxxxxxxxx
Subject: Re: [TCML] Sword like dischare in CW mode, VTTC

Hi Jim,

When the plate voltage is doubled, the plate current will tend to
double also, if the tank impedance is left unchanged ( assuming
the components can handle this extra power)  This will
cause the system to process four times the power and give
twice the spark length.

If you are refering to the level-shifting (AC doubler) circuit,
this runs the coil at the same 60 PPS rate that it
would run at without the AC doubler.  Sometimes this might burn
up a tube without using staccato, depending on the tube specs, and
the power input.  I suspect that some folks using staccato never
run at 60 PPS.  Many of the staccato boards in use have 30 PPS
as their lowest frequency.  To get 60 PPS, the staccato circuit
needs to be switched off (not just set at the fastest setting).

The staccato mode when set to slower rates can produce the
solitary sword-spark.  This can be seen at my website.  This type
of spark appearance cannot be produced at higher pulse rates.  The
higher
pulse rates can sometimes produce spikey sword-like sparks, but
multiple sparks will be seen, not a solitary spark.

   http://futuret.110mb.com

John
<SNIP>

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