Advertisement from the Music Trade Review.
The Amphion Action as advertised in a 1918
issue of the Music Trade Review. The utter simplicity of the
Amphion action is immediately obvious, and the cut-away view
shows the uncluttered internal construction thereby making it
easy to comprehend how the unit value functions. The Amphion
action was comparatively
cheap, simple to install, adjust, and repair--all sought after
attributes that any player piano manufacturer could readily appreciate.
All that was needed, for instance, to replace an errant
unit-valve was to remove a single hex nut holding a spring clip
retainer in place and the valve could be immediately replaced--and
without the annoying and time consuming task of removing the
stack from the piano.
Considering the mechanical complexity of the Melville Clark
designs and the factory space required to manufacture them it is
no wonder that the Apollo Piano Company (i.e., Wurlitzer)
elected to abandon the old designs for the Amphion system.