modules with different tubes?

[Eric]

At 04:28 PM 1/9/01 -0800, you wrote:
>hey there, i've had the good fortune to get a bunch of tv tubes,
>can these be used to make synth modules??
>most of these tv tubes are meant for oscillators, but at a fixed
>frequency. what types of oscillator circuits lend themselves to
>voltage control?? 

Easiest are thyratrons. You probably have common
pentodes and dual triodes. The pentodes can be used
easily to make VCFs and VCAs.
 
You can get 2D21 or 5696 thyratrons from www.tubesandmore.com 
for about $2.50 apiece.

VCOs were rarely made in the tube era, and then usually
were based on a thyratron relaxation oscillator (as in my VCOs)
or on an optocoupler.

>i've also got a line on the guts of a lowery organ full of
>6x8's, which i've heard can also be made into VCOs. are there
>any schematics out there for 6X8/12AX7 VCO circuits?

Not really, the 6X8 was intended for use as a frequency
divider (i.e. flip-flop). Was so used in Lowreys and in
the infamous Cordovox electronic accordion. The latter
used 82 of them, in 2 auxiliary cabinets....

Eric Barbour
METASONIX