[sdiy] Re: did someone say "tube"?

[Thomas Holley]

I don't claim to be a really smart designer, merely a hack. I have been
working on gathering information on what/how synths work so I can make
something for my son. I have taken all of the published info from your
designs as well as several others and it has been extremely helpful. I have
preliminary designs using tubes for :
Moog ladder filter
MS-50 VCF
Barbour BP VCF
VC LP, HP VCF
ADSR
Voltage controlled Glide
Parametric Filter
Voltage controlled Delay (5ms,10ms 15ms,20ms)
Pan/Fade
1V/Oct VCO
Wein Bridge LFO
Reverb
Compressor
Mixer
Phasor
Barbour Beam Modulator
Hugh Vocoder with 81 tube count to warm your home in winter.
    A reasonable 1V/Oct tube keyboard controller is my current endeavor. I
have a nice circuit in opamps and transistors compiled from various
ARP/Oberheim/Moog designs, but can't seem to get the sample and hold tube
circuit to hold well in simulation.

Thomas

----- Original Message ----- 
From: <metasonix at earthlink.net>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Saturday, June 07, 2003 3:39 AM
Subject: [sdiy] Re: did someone say "tube"?


> > tube circuits though. Only transistors in a rather primitive way. Now
>  >I much prefer tubes and am working to design a modular system
>  > with mostly tube circuits.
>  >> I think we learned feedback theory as exactly that:
>  >> theory, with black boxes full of system functions.
>  >> My own shock, learning about tubes on
>  >> my own years later, was finding that most or all of the stuff we
>  >> learned on transistors had been worked out decades before on tubes!
>  >> No one ever mentioned this.  It was like electronics started with the
>  >> transistor.  The things those old timers could do with a handful of
>  >> tubes, like making a TV, blows me away.
> 
> Golly. You guys keep ending up talking about tubes. How strange.
> I thought we all agreed that tubes were useless crap and that
> I was a low scum.   ;)
> 
> Hey Tom. Here's a challenge for you. Make a workable 4-pole
> lowpass filter capable of resonance...entirely out of pentodes.
> A really, really smart designer could do it with 6 to 8 tubes.
> 
> Any other takers?
> 
> 
> 
> 
>