I have built this circuit some years ago with a TB5/2500 triode @ 6kV plate
voltage. There is no need of grounding the coil. I achived 40cm long HF
flames easily with a proper tuned coil. By the way I did some other
modifications to this circuit, but have forgotten them. I remember, that
some capacitors are not really needed. Later I wanted to try even a SRS302
tube with 10kV plate voltage, but than I was afraid of x-ray production and
stopped further experiments. The circuit is a hartley oscillator which is
highly efficient and it's even possible, to audio modulate such big flames,
when using a tetrode instead of a triode.
----- Original Message -----
From: "William Howard" <snakeprior@xxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Thursday, July 31, 2014 11:54 AM
Subject: [TCML] Grounding for HF VTTCs?
Dear Group,
I built a HF VTTC based on this circuit:
http://4hv.org/e107_plugins/forum/forum_viewtopic.php?126638.0
I added a charging reactor in between the hv out from the doubler and the
resonator. It smooths the output and reduces the noise considerably. I
was wondering is there is a way to ground the low voltage side of the
coil?
I was hoping grounding the coil would improve performance and reduce EMI.
I am tempted to use a vacuum capacitor between the bottom of the coil and
rf ground. Will this work or is there another circuit that will allow me
to
ground the coil I can use?
You can see my setup here: http://youtu.be/4PvLM8yMucI
Cheers!
-Wil
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