[sdiy] Moog ladder theory questions

[cheater cheater]

Guys!
this has completely derailed :)
I just want to know what transistors you use in your circuit boards,
and what beta they have.
:)

Cheers
D.

On Thu, Jan 15, 2009 at 6:12 AM, Naoki Iwakami <naoki.iwakami at gmail.com> wrote:
> Hi cheater cheater,
>
> It's quite detail but I believe beta difference between left to right
> in the ladder create slight unbalance in the ladder output.  I think
> that's why the minimoog service manual mentions about matching
> transistor.
> (http://www.fantasyjackpalance.com/fjp/sound/synth/synthdata/16-minimoog/002/905-matching-transistor.gif)
>
> But in my experience this issue is not so critical.  When  I used
> 2SC1815, very generic transistor easily available in Japan, I tried
> the Moog matching method but most of the transistors are within the
> recommended range already.  Also I've not heard of any transistor
> ladder VCF problems among my friends due to lack of transistor
> matching.
>
> Thank you,
> -- Gan
> http://gaje.jp/
>