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More information on the different ESA Dynotron calibres can be found here Thirdly, the ESA 9159 which, from the balance side, looks identical to an ESA 9158, but turn it over and you’ll see that there is no provision for conventional hands instead it took discs and was only fitted in the Gruen Electronic jump hour watch. I believe it was only ever used in the Jaz-Derby Swissonic. The balance wheel is on the end of the cylinder assembly in this movement although it looks very strange, the working principles of the ESA 9176 are identical to the other Dynotron movements.
Esa 9154 service manual series#
Secondly, the ESA 9176 Dynotron from 1975 which consisted of a series of cylinders for the numerals, very similar to a car mile-o-meter. It was only used in the Certina Biostar Electronic watch. …and then there were a few weird movements: firstly, the ESA 9156 Dynotron from 1972 looks like a normal ESA 9154 from the balance side, but turn it over, and it has a series of discs to display one’s biorhythms. The Dynotron range continued through to the mid to late 1970s: ESA 9154, ESA 9157, ESA 9158…
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This was a Fixed Coil, Transistor Controlled Balance type movement and appeared in 1968 it was the worlds first movement with a balance that employed a transistor. The first electric movement to bear the “ESA” name on its plates was the ESA 9150 or “Dynotron”. Transistorised Movements with Balance Wheel.