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Re: Pentode valve TC (fwd) (singing spark) (fwd)
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To: tesla@pupman.com
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Subject: Re: Pentode valve TC (fwd) (singing spark) (fwd)
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From: Tesla List <mod1@pupman.com>
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Date: Sun, 12 Jul 1998 21:34:06 -0600 (MDT)
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Approved: mod1@pupman.com
---------- Forwarded message ----------
Date: Sun, 12 Jul 1998 10:49:16 -0700
From: Jim Lux <jimlux@earthlink.net>
To: Tesla List <tesla@pupman.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.