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

[metasonix at earthlink.net]

 > 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?