[sdiy] Ladder filter pole

[harry]

One of the difficulties with tubes would be the filiment voltages...

It could be handled with isolated dc/dc converters.  These are often
used for H-bridge inverters (Motor Drives etc...)

You silly boys....

OTOH a tube ladder would be a pretty cool project... send me some
piccys when you get it working

H^) harry

Magnus Danielson wrote:

> 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

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