That old Hammond X-66 was quite a beast in it's day.
http://www.nshos.com/X66Contents.htm A good friend of mine, here in Nova Scotia, a Mr. John Sands (formerly from the UK and quite a player in his own right) used one for many years and eventually moved on to (and remains with) the
relatively lighter Yamaha EL-90 series for more orchestral type sounds than offered by the X-66.
Ian