Restoration

Electromechanical Escapement on Wurlitzer 200a

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oromoiluig

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Opening post by oromoiluig

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Hello everyone, I have just joined because I have a problem with my Wurlitzer electric piano (mod 200a). Don't be fooled by the name: the only electric part is the amplifier, while the sound generation is completely mechanical (a simplified piano mechanism with stand, dampers, escapement, and hammers that strike metal reeds whose sound is transduced by a capacitive pickup to be amplified by a dedicated amplifier).

The problem I have is that in some keys the "click" of the escapement occurs before the escapement lever stops against the escapement adjustment screw: it seems that the escapement lever slips on the felt of the hammer head.

By changing the hammer and putting one from a "working" key, the problem sometimes persists and sometimes instead is resolved.

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Reply 2 by pianoexpert

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I would say that the problem should be in the adjustment of the let-off screw. It could also be that the escapement lever pivot is stuck. Let me know

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Reply 3 by oromoiluig

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in truth no: the escapement adjustment screw moves without problems, the problem is that the escapement lever escapes BEFORE reaching the adjustment screw.

At the suggestion of a tuner friend, I reduced the thickness of the red felt on which the escapement lever rests at rest; this solved the problem. Were there perhaps other (less invasive) alternatives?

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Reply 4 by pianoexpert

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it could work. In fact, if the rest button is too thick, the elevation movement alone could cause the lever to "escape" from the seat of the "nut" or "jack" under the hammer.

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Reply 5 by oromoiluig

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the strange thing is that the defect was present in ten of the 64 keys of this piano, and observing the nuts of the incriminated keys, they did not seem to have substantial differences from those of the working keys

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