Darryl, Typical mid-1920's Ampico A instruments were usually fitted
with an 1150 rpm 1/8-horsepower Holtzer Cabot motor with a 1.75"
diameter pulley, resulting in a final pump speed of about 125 rpm.
Best regards,
Ralph Nielsen
http://www.historicpianos.com/
(Message sent Fri 4 Dec 2015, 08:40:48 GMT, from time zone GMT-0700.)
