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Jacob Doll

Pneumatics face forward and engage with the piano action through rocking levers mounted under the stack. A double valve system was used that was quite similiar to the Standard action. The pneumatic air motor was the five-point type. There was only one equalizer (or reservoir bellow). In front of the left foot pump bellow is a governor for expression, in addition to the governor for the air motor on the opposite side. There was no automatic tracking device. Instead, it had only a finger lever for tracking adjustments and transposition.

There is nothing particularly difficult about restoring this action. All of the measurements needed are quite commonplace with respect to player pianos. If necessary, see the Standard Action for specifications.

There is NO Service Manual or Technical Reprint available!
Also, there is No information in 'Player Piano Servicing & Rebuilding'

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