2sk30(O) question

[Fraser, Colin J]

> -----Original Message-----
> From: Heiko van der Linden [mailto:H.J.vanderlinden at stud.far.ruu.nl]
> Sent: 01 March 1999 15:08
> To: synth-diy at mailhost.bpa.nl
> Subject: 2sk30(O) question
>  
> Does anyone know the device characteristics for the 2sk30(O) 
> this is the
> fet from the tb303 vco.
> I want to know the pinch off voltage and the tresholdvoltage ( these
> make the odd waveshape ?).
> And does anyone know a source for this fet or a substitute.

I believe the 'O' refers to a Roland selection grouping of 2SK30 fets -
probably the 'orange' group.
You'll also find Y and G types (yellow and green ?) on other Roland
schematics.

I don't have any further details than this, but I think I have a couple of
2SK30(O) extracted from a Sh09 somewhere, so if you can tell me how pinch
off and threshold voltage should be measured, I can tell you the specific
characteristics of the parts I have.

Colin f