The resistor needed for the Violano feed motor is a Mallory 20AV-200.
One was listed on eBay and I don't think it sold.  It's a 200 ohm,
200-225 watt adjustable resistor.  It would also be advisable to get
a couple of extra adjusting bands; normally only one comes with the
resistor.

Hope this helps.  Any questions?  Just contact me -- I'm always
available for advice.

Musically,
Robert Loeffler - Roberts Musical Restorations
Deland, Florida
http://www.robertsmusicalrestorations.com/