Tube Synth

[Paul Maddox]

All,

  I intend to put polystyrene (stryrophome?) ove my expo
converters, even though they are temp compensated, dont forget
to do the underside of the PCB too if you using matched pait in
a DIL format..

  Paul

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-----Original Message-----
From:	tomg [SMTP:efm3 at mediaone.net]
Sent:	Wednesday, October 27, 1999 3:29 AM
To:	Harry Bissell; chordman at flash.net
Cc:	synth-diy at mailhost.bpa.nl
Subject:	Re: Tube Synth

You have a point here Harry. You could set it inside a thermal
cooler then ice the outside of the cooler and achive the same effect.
Someone said Berry suggested glueing a styrophome  peanut
over expo-converters. When I first heard this I thought it was funny.
I have changed my mind. My apoligies to Berry for the expo-happy
meal comment..I though it was funny...anyway  I think a squirt of insolating
foam on a  diff-pair with a tempco glued to it is a real solution to temp
drift.
A vacuum tube would work too I guess....;-)

-tg


>The "ice test" on the tubes is a bunch of Bvhhsh!t.  THINK folks... they
>put hot (and cold) liquids... even liquid NITROGEN... in VACUUM
>bottles....
>
>Why... Because a VACUUM is a very poor conductor of heat... it has
>excellent thermal isolation properties... So you can freeze the the
>outside envelope of the tube and not change the internal temperature ONE
>BIT (oops I said bit... but thats not digital in this case is it...).
>
>Spray the components at the base of the tube... watch the fun begin...
>