I would like to comment on the information Andrew Barrett posted in
010915 MMDigest regarding Wurlitzer Band Organ tracker bar scales.

On the Wurlitzer style 150 roll, the bells are connected only to the
bell register hole (hole 2); the bell hole controls no pipes.  There
is only one automatic pipe register in a 150 roll (hole 3), and it
controls any ranks of pipes connected to it.

Other organs that used the style 150 roll, mostly earlier styles, did
use brass piccolos.  Early style 146 organs had brass melody piccolos
on the front, not wood pipes as in the case of the late style 146-A
and B.  The style 150 had a rank of brass clarinets also.

The tympani effect in a Wurlitzer 165 Band Organ is a single stroke
pneumatic that plays the bass drum, and the reiteration is punched
into the roll.  As an exception, I know of one style 165 that has an
alternating 2-pneumatic tympani effect, and along with that the main
bass drum beater is suction operated like an orchestrion, meaning it
is not operated by exhausting the pressure as is done traditionally.

The Wurlitzer 165 never meant to have bells tubed to the bass section.
This hole (Bass-Bells-Uniphone on?) was probably meant to be used on
a much larger organ than the 165.  Its intended function is not clear.

Regards,

John D. Rutoskey