tube synthsizer

[Haible Juergen]

	>This is the web page that shows this experiment...
	>
> http://www.metasonix.com/freeze.htm
	>

Freezing the expo converter like this and then getting no more
frequency error than shown there is impressive indeed.
But waitaminute - is there an expo converter at all ?? I thought
not.

In a solid state linear (i.e without expo converter) VCO design, I 
can see two weak points when it comes to freezer spray:
temperature coefficient of the capacitor(s), and leakage
currents because of the condensed humidity. I guess
(and it's *only* a guess) if you're putting your semiconductors
in a glass container, and hide your capacitors under a solid
metal chassis, the freezer spray won't harm the VCO frequency
much either.

It always depends on *what* you compare. Imagine you found
a way to apply the freezer spray to the *heater filament* of the tube,
and then list the frequeny error ...

JH. (;->)


PS.: Don't flame me; I *love* tubes. Just building a tube preamp
       for my Wurlitzer piano.