tubes and synth circuits.

[Ken Stone]

It occured to me these tube VCO's would be real candidates for automatic
tuning circuits ala some of the polyphonics based on the 3340. With a
microprocessor up front, and some sort of frequency counter as feedback, the
processor would be able to create a table containing the responce curve,
even updating it if the oscillator drifted for whatever reason.

Personally I have no problem with the concept of hybrid synths. If the tube
VCO's were linear enough, why not use a transistor to produce the
exponential curve? I noticed the led/ldr optocoupler in one of Eric's
circuits, so why not take it further? 

Ken 

>  Spare no details I'm definitely interested.  I've been mulling over Eric
>Barbours tube synth and thinking the thing to do would be to get a Fatman
>(or midi to CV) and tweak the code on the 8051 such that DAC output is
>mapped to compensate for the non-linearities of the CV response of the tube
>VCO. From the DAC on out would be all tube of course.
_______________________________________________________________________
Ken Stone   sasami at blaze.net.au  
Catgirl Paradise <http://www.anime.net/~kens/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>