The long lost 2SK 30(O)

[Peter Tang]

On Thu, 16 Nov 2000, Fraser, Colin J wrote:

> > -----Original Message-----
> > From: Trevor Page [mailto:trevor at resonance.fsnet.co.uk]
> > Sent: 16 November 2000 11:28
> > To: Fraser, Colin J; *Star Project; DIY skicka Lista
> > Subject: Re: The long lost 2SK 30(O)
> >
> > I guess it is down to luck. I must have been fortunate to get
> > a batch of -Y variants which happened to make a good
> > substitute for the -O! I used -Y's in my TB3030's and got
> > good results, i.e. producing squarewaves of the correct
> > pulsewidth. Placing a trimmer in the differentiator circuit
> > is a good idea. I stuck a trimmer in place of R35 and then
> > managed to get several JFETs to work. Trim for a nice 50%
> > duty cycle, but remember this varies with frequency anyway.
>
> And as Tony said, the component tolerances mean different 303s will differ
> slightly too.
> My clone is adjusted to sound the same as my real 303.
> Whether it sounds the same as any other is another question.
>
> It might be worthwhile having a sample of a reference 303 squarewave at a
> given pitch somewhere...
>
> Colin f
>

A reference saw tooth would be a great thing as well.

Peter Tang
Invisible Fish (www.invisiblefish.com)
Hard Unique Tech* (www.mp3.com/petertang)