tube based filter

[A.S.P.]

On Thu, 31 Oct 1996, Keith Sterling wrote:

> 
> 
> >On Thu, 31 Oct 1996, Keith Sterling wrote:
> 
> >> This is all cool, but has anyone built and listened to a tube 
> >> based 4 pole lowpass filter?  
> 
> >Not that I know of. 
> 
> >R.G. 
> 
> I wonder if anyone familiar with the differences in nonlinearities between tube and transistor circuits or whatever it is that makes tube amps sound so good could comment on whether
> a tube 4 pole lowpass would sound any different that the solid state filters we have now?  As
> we all know, the filter is the heart of any synth's sound, maybe a tube filter would be an entirely 
> new "classic" filter, like the JP-8 or moog.
> 
> keith.

Ummm....

Harald Bode designed an organ back in the 40's or 50's, I believe it was
called the Formant (?).  I don't think the filter was voltage controlled,
but it did use some type of bandpass, giving the organ human like sounds - 
thus the name. 

Romeo