[GreenKeys] Thyratron used in audio ! !

[drlegendre .]

The 2D21 Thyratron is used as a VCA in several tube-based analog music
synthesizers. They are operated as a standard relaxation oscillator with
the DC control voltage input straight to the grid. I built a couple of
these modules once, and IIRC they were good across a range of several
octaves. Of course, the CV required careful scaling (tuning) to produce
anything like a tempered scale.

Check out Eric Barbour's articles on this device for musical use.

On Wed, Mar 22, 2017 at 7:54 PM, <hwhall at compuserve.com> wrote:

> >Who remembers or built a modem using television horizontal oscillator
> coils for the filters?
>
> Did that at our college ham radio station. Circuit was from an ARRL
> Handbook I think. NE-2 bulb indicators for mark & space. The amazing thing
> to us then was that it sometimes produced error free copy when our ears
> couldn't hear the received station.
>
> Wayne
> WB4OGM
>
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