modules with different tubes?

[Ken Stone]

Quite a few different tubes can be used for various modules. I have made the
VCAs and VCFs with odd TV pentodes. The one in the 6X8 should also work.
This tube could also be used in the LFO. (Must chase up the circuit for this
- it went down with synthfool.) 

VCOs are best done using thyratrons, and these are more of an "industrial"
tube. You might have to buy them. See my page at
http://kato.sai.com.au/catgirl/synth/ and the temporary
http://www.blaze.net.au/~sasami/synth/ for more info.

Mind you, the 12ax7s could probably be used in the control and amplification
parts of the vco. I haven't tried one myself, but I think it was what Rene
was using.

Ken

>hey there, i've had the good fortune to get a bunch of tv tubes,
>can these be used to make synth modules?? i've already checked
>eric and rene's designs for tube types, but no matches so far.
>most of these tv tubes are meant for oscillators, but at a fixed
>frequency. what types of oscillator circuits lend themselves to
>voltage control?? it looks like multivibrator circuits are
>pretty common in tv-type circuits, but those don't look friendly
>to voltage control. just a few thoughts...
>
>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? the whole
>concept of tube synthesis is extremely interesting and i'm
>really trying to get into it, and now i have a bunch of tubes,
>so all i really need now is to track down <or make!> some good
>designs...thanks...Nick
>
>
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_______________________________________________________________________
Ken Stone   sasami at blaze.net.au  
Catgirl Paradise <http://www.anime.net/~kens/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>