Hi Folks,  Perhaps I'm due for a history lesson.  I recently rescued
a 1910 Shattuck upright player piano with a Standard Pneumatic player.
Upon removing the stack from the piano, I was surprised to find it had
a 3-tier single-valve system. I thought that Standard only started
using a single-valve design sometime in the late 1920s.

From what I can tell, the piano is in original, unmodified condition
(and of course therefore is inoperable).  The spoolbox is oak to match
the veneer of the cabinet.

My question is, Why would they have used this early single-valve design,
then gone back to a more-costly-to-produce double-valve design later in
the 1910s and into the '20s, only to go back to a single-valve design
in the end?  Was this early [Standard] single valve system unreliable?

I'm asking not only out of curiosity but also as a deciding factor if
this unit is worth restoring.

Nate Otto - Rum River Restoration
Anoka, Minnesota
https://www.rumriverrestoration.com/ 
nate@rumriverrestoration.com.geentroep [delete ".geentroep" to reply]

 [ It might not be a Standard Pneumatic player action -- see
 [ https://www.mechanicalmusicpress.com/registry/chicago_elec/cgo_elec_p10_std.htm 
 [ -- Robbie