Re: [TCML] Massive VTTC!!!

["Roger Smith" <rwsmith@xxxxxxxxxxxxxx>]

Hi  Carlos,   It's hard for me to make suggestions without knowing more 
about your coil but I do know you should be getting  sparks longer than 2 to 
3 feet.  I have a tube coil that runs in half wave mode and I'm getting 2 
foot sparks with 4 kw input.  These aren't straight line sparks either they 
have some branching.

   There is one mistake I have seen a some people make.    If you put the 
tickler coil above the primary coil like most people do you got to make sure 
the secondary coil is wound the right way or the whole thing will perform 
very poorly.  The reason for this is that the tickler coil is effected by 
the electric field from the secondary as well as the magnetic fields.  If 
you wind the secondary the wrong way the electric field will be working 
against you and not for you.   The way to get it right is to wind your 
primary coil, secondary coil and tickler coil all in the same direction from 
top to bottom.   The top of your tickler coil goes to the grid and the lead 
from the bottom goes to the grid resistor and capacitor.  The top of the 
primary coil goes to B+ and the bottom goes to the plate of the tube.

  I wouldn't worry about staccato mode.  Staccato mode is for people with 
wimpy tubes.

Roger
----- Original Message ----- 
From: "Carlos Van Camp" <carlos@xxxxxxxxxxxxxxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Wednesday, November 03, 2010 3:30 AM
Subject: [TCML] Massive VTTC!!!


Hi guys (and gals),
I have been building a VERY large VTTC for the past 2 years, and I am in the 
final stages of testing and tuning.
This machine has been built with brand new high power components and has an 
input power capacity of upto 50kw.
The valve is a tetrode (4CX15000a) with a plate dissapation of upto 15kw.
I am an experienced builder of large SGTC, but fairly new to valve coils.
The trouble is that dispite an input of 30-35kw of power (CW mode), I am 
only achieving arcs 2-3 foot long (6 arcs at once coming off the top 
electrode).
I understand that VTTC's make much shorter arcs for the power applied, but I 
have heard of people making arcs 8 ft long with less power than I have 
available...
So... What am I doing wrong...?

Does using a stacatto system truely make arcs longer...? Or does it just 
reduce the input power?

Does any body have practical experience using thyratrons in place of spark 
gaps, and would one be suitable to produce a musical coil? (ie changing 
pulse rate to play tunes etc)

Thanks,

Carlos.
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