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Accutron 218 tuning fork frequency3/24/2024 ![]() ![]() Instead of the ticking sound made by mechanical watches, the Accutron had a faint, high-pitched hum which came from the vibrating tuning fork. The letter is the decade (M=1960s, N=1970s) and the number is the specific year within that decade. The tuning fork was powered by a one-transistor electronic oscillator circuit, so the Accutron qualifies as the second 'electronic watch', following the Hamilton Electric released in 1957. * The date code: located on the back of the case, it consists of a letter followed by a number. Setting instructions for the Bulova Accutron Tuning Fork Watch. PO Box 1265 101 Airstrip Road Kill Devil Hills, NC 27948 email protected. The Accutron was guaranteed to be accurate to a minute per month, or 2 seconds per day, considerably better than mechanical watches of the time.īulova made its last tuning fork movement wristwatches in 1977. Setting instructions for the Bulova Accutron Tuning Fork Schauen. Instead of the ticking sound made by mechanical watches, the Accutron had a faint, high pitch hum which came from the vibrating tuning fork. This was OK when the magnets were energized by 1.3 volts but at 1. A relative few have tuning forks that were cut to the thinner end of their tolerances. The bottom of each 214 tuning fork tine was notched at the factory to set the frequency (click photo). ![]() The tuning fork was powered by a one transistor electronic oscillator circuit, so the Accutron qualifies as the first « electronic watch ». Hey John, Welcome to the Bulova & Accutron Forum. Bulova’s "Accutron" watches, appeared in October 1960. It is of course in perfect working order and keeps perfectly time as explained in the short historical note below. The vibration of the tuning fork is controlled by a transistorized circuit in the following way: when the left magnet on the tuning fork moves to the right, the phase-sensing coil generates an induction voltage on the base of the transistor. The watch has been serviced in January 2023 (+ new battery) The Bulova - Wikipedia Accutron has a frequency of 360 oscillations per second (360 Hz). Screwed stainless steel back numbered (D19197 / M7*) (This movement equipped the Universal-Genève « Unisonic ») The Bulova Accutron has a frequency of 360 oscillations per second (360 Hz). Steel - Kinetic Accutron system (see below) ![]()
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