Tube Challenge!!

[Caloroso, Michael E]

> > Can you think of any historical applications where tubes 
> > were used for voltage or current controlled resonant 
> > filters??
> 
"The Art of Electronic Music" (out of print) has several ancient systems pre-dating 1950 - the Hammond Novachord is one that comes to mind.  Harald Bode also built some stuff.  Also check http://www.obsolete.com/120_years/

MC
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