Re: Pentode valve TC (fwd) (singing spark) (fwd)

• To: tesla-at-pupman-dot-com
• Subject: Re: Pentode valve TC (fwd) (singing spark) (fwd)
• From: Tesla List <mod1-at-pupman-dot-com>
• Date: Sun, 12 Jul 1998 21:34:06 -0600 (MDT)
• Approved: mod1-at-pupman-dot-com

---------- Forwarded message ----------
Date: Sun, 12 Jul 1998 10:49:16 -0700
From: Jim Lux <jimlux-at-earthlink-dot-net>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: Pentode valve TC (fwd) (singing spark)


> 
> Anyway, the sensitivity of the pentode suppressor and screen mean that
when
> i've got the full cct optimised, I should be able to drive those grids
with
> modulating waveforms: square waves at a few tens of Hz all the way
through
> to udio (singing brush etc. Just like Moses saw, I suppose).

You might look into the "ionophone". It was a plasma driven loudspeaker
essentially using a modulated CW brush discharge of sorts. Supposedly had
good frequency response (no heavy mechanical parts moving), but the
inevitable ozone raised a problem.

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