[sdiy] Ladder filter pole

[Magnus Danielson]

From: Tim Ressel <madhun2001 at yahoo.com>
Subject: RE: [sdiy] Ladder filter pole
Date: Thu, 18 Apr 2002 08:50:22 -0700 (PDT)

> Gene et al,
> 
> I can't help but wonder if one could build a ladder
> filter out of tubes? I think it'd take a +/- 300V
> power supply to put that many tubes in a stack. Or
> would one use diode tubes in the middle?

What drives the Moog ladder is the dynamic properties of
transistors. He learned to carefully use the dynamic properties of
tubes in school. The trouble is that tubes follow a different curve
than the exponential. You should be able to try it out on MOSFETs but
on much lower voltages.

Cheers,
Magnus