Re: audio modulated SSTC

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jim Mitchell" <electrontube-at-sbcglobal-dot-net> 

Okay the bug has bitten me! (again) and I think I will build an audio
modulated SSTC this weekend.  One question.  If I made a self resonant
design, then I put an IGBT in series with power to the bridge, and fed audio
to the IGBTs gate, woudl that work?

Regards - Jim Mitchell
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Wednesday, February 04, 2004 7:18 PM
Subject: RE: audio modulated SSTC


 > Original poster: "Ian McLean" <ianmm-at-optusnet-dot-com.au>
 >
 > Hi David,
 >
 > I sure would be interested in seeing some details of your audio modulated
 > VTTC.  I am interested in pursuing this more than the SSTC route - don't
 > like the thought of blowing up all those FET's/IGBT's ;)
 >
 > Rgs
 > Ian
 >
 >  > -----Original Message-----
 >  > From: Tesla list [mailto:tesla-at-pupman-dot-com]
 >  > Sent: Thursday, 5 February 2004 10:05 am
 >  > To: tesla-at-pupman-dot-com
 >  > Subject: RE: audio modulated SSTC
 >  >
 >  >
 >  > Original poster: humanb-at-chaoticuniverse-dot-com
 >  >
 >  > I think AM mod of the rail would be the way to go for
 >  > real HiFi SSTC. Truly, the gate modulation is going to
 >  > get ok audio, but not quite HiFi. But the results are
 >  > realy quite impresive, and Jim, you shouldn't shoot it
 >  > down without at least trying it. I only wish I could
 >  > get more plasma to modulate! I know from My VTTC work
 >  > that a hotter and larger plasma discharge will give you
 >  > a deeper more full sounding audio. As it is I am quite
 >  > happy with the results, but the better tone control you
 >  > have over the audio source the better. A in-line
 >  > equalizer would be ideal, but I am happy with my
 >  > previously mentioned pre-amp with base and treble
 >  > control, works well enough. Sure the heck beats trying
 >  > to fight with my audio modulated VTTC everytime I
 >  > wanted to play with it!
 >  >
 >  > Regards,
 >  >
 >  > David Trimmell
 >  >
 >  > On Wed, 04 Feb 2004 08:18:51 -0700, "Tesla list" wrote:
 >  >
 >  >  >
 >  >  > Original poster: "Mccauley, Daniel H"
 >  >  > <daniel.h.mccauley-at-lmco-dot-com>
 >  >  >
 >  >  >
 >  >  > I wouldn't go so far and say something like that.
 >  > SSTC
 >  >  > audio modulation
 >  >  > is a very worthwhile and rewarding experiment.
 >  >  > Performance can actually be very impressive and
 >  > quality
 >  >  > is quite high
 >  >  > despite the fact audio is coming from a high
 >  >  > voltage plasma.  For anyone who've heard my stereo
 >  > SSTC
 >  >  > PlasmaSonic
 >  >  > coils in action can attest to that.
 >  >  >
 >  >  > I've also done some additional work early this winter
 >  >  > with the use of
 >  >  > parametric equalizers to further refine the audio and
 >  >  > ultimately the
 >  >  > quality of the playback with a SSTC coil.
 >  >  >
 >  >  > So in summary, audio modulating an SSTC coil is
 >  >  > DEFINITELY worth it.
 >  >  >
 >  >  > Dan
 >  >  >
 >  >  >
 >  >  > Well I for one would say audio modulating an SSTC
 >  > isn't
 >  >  > worth it since
 >  >  > you only get mediocre sound quality.  Tube driven
 >  >  > tweeters run in the
 >  >  > 10s of megahertz range.  Having built a tube driven
 >  >  > plasma tweeter, I
 >  >  > can tell you that the coil that actually steps the
 >  >  > voltage up is only 15
 >  >  > turns of 16awg solid wire, so it's resonant frequency
 >  >  > will be very high.
 >  >  > Yes they do use grid modulation, but the tube is
 >  >  > already running at
 >  >  > around 30mhz to generate the plasma flame, then you
 >  >  > just modulate the
 >  >  > signal to the coil.  I wonder if there is such a thing
 >  >  > that you could
 >  >  > use to build a self resonant audio modulated sstc by
 >  >  > feeding the output
 >  >  > of the comparator to another chip which would also
 >  > take
 >  >  > the audio input.
 >  >  > That way, it could amplitute modulate the input signal
 >  >  > from the
 >  >  > comparator, which I think would allow audio
 >  > modulation,
 >  >  >  is there such a
 >  >  > thing?  I think he was getting his info from dan's
 >  > site,
 >  >  > www.spacecatlighting-dot-com...
 >  >  >
 >  >  > Regards - Jim Mitchell
 >  >
 >  >
 >
 >