Hi,  I am rebuilding a 1922 Neuman Brothers player piano.  This piano
has a stack that I can't identify: it's a two-tier, with vertical
valves.

The valves are single discs of wood, with wire stems, and small force
fit collars (vaguely similar to Aeolian).  The valve board screws on
the top of the stack board, right below the spoolbox.  The stack board
has wind channels (like Gulbransen), then the tier boards screw on to
it.

The bottom valve seat are made of brass, and the top seats are made
from screw-on sections, very similar to Baldwin.  Suction is applied
to both bass and treble ends of the stack.  There are no poppet rods,
only abstracts on the action.

The wind motor is identical to the motors used in Simplex actions,
no tracker mechanism.  The pumps are small, almost identical to the
Gulbransen with the "valve" regulator, except it does not use the
rotary valves.

After rebuilding, it works great, but I have no idea what it is.
If anyone knows I would appreciate it.

Andy Taylor
Tempola Music Rolls