Hammond organ serial number dating
This series were all designed in the United States, built in Japan, and subsequently also assembled in England: Initially, first series were built by Yamaha (c.1969–), then by Nihon Hammond during 1973–1975.
Each tonewheel assembly creates tones with low harmonic content, close to a sine wave. As the teeth of the tonewheel pass by, the strength of the magnetism changes—when the tip of a tooth is closest to the tip of the magnet, the magnetism is strongest.
The only exceptions would have been for the E-series, the H-series, X-66 and the X-77 series. We would be thankful and honored to include in our identification section a picture from you of any of the models that are missing. As this section expands there will probably be some more instruments that we will not be able to come up with a suitable photograph for.
On these models the plate remained on the lower right hand corner of the rear of the instruments. They are identified and are without picture above the model. Keep checking us out; we would appreciate your help.
The sound generator is electrically similar to Solovox Model L.
It consists of a vacuum tube oscillator and five frequency divider circuits, controlled by a volume and 8-stop tablets (Bourdon 32', Bombarde 32', 16', 8', 4', 2' & 1', mute, pedal solo on) placed on the right side of lower manual.