Re: [TCML] Massive VTTC!!!

[bturner@xxxxxxxx]

Carlos -

>From my own limited experience with VTTC's, it is true that spark length
is shorter. However, since the system is running in CW mode (Well, 60hz
modulated CW... Unless you have a very stable DC plate supply) you are
getting much higher RF current in the discharges.

Spark-gap systems are more impulse systems rather than CW, an intense
magnetic field pulses the secondary into resonance. Hence, higher output
voltage but also somewhat reduced output current as well.

The 'staccato' driver operates somewhat similar, the pulse train into the
screen grid 'pulses' the plate tank circuit very much like a spark-gap
system. Also, with VTTC's, 'q-factors' really influence the sharpness of
the secondary's response as well as the actual conduction time of the
triode or tetrode.

 - b



> 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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> Tesla@xxxxxxxxxx
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>
>

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