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[TCML] polyphonic spark gap tesla coils



http://120years.net/category/country/canada/

The Wireless Organ..

note carefully the diagram and photo..
An interesting 1 octave rotary gap

A LC resonator in an autotransformer configuration - #46 is basically your tesla primary/secondary - #43 is your NST

I believe that one problem with this device would have been that the line frequency would modulate the tones being generated - a sort of tremolo effect, no doubt. Hey, I'm sure Hammond or Leslie used the effect in some way too.

I've thought that a good way to solve this would be do a DC coil, but then you need de-Qing diodes and charging inductors.

Good HV design practice, the motor and spinning shaft are at ground potential. More than one TC enthusiast has burned up a RSG drive motor.

and he improved it later..

I note this: "Obviously, in order to produce chords, it is only necessary to supply a current of sufficient intensity to permit of a plurality of different sets of sparks at the same time consequent upon the pressure of the corresponding number of keys."

So M. Desilets also appreciated "mo' power"
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