Hammond serial number dating
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.
Also up to that time, the serial and name plates were either a metal or heavy plastic material.
In the late 1960s and on through the 1985 production, the year when the company went out of business, the name plate including the model and serial number innformation along with the Hammond Organ Company name and 4200 Diversey Avenue address in Chicago was located under the lower keyboard assembly, acccessible and viewable from the lower front of the instrument.
Tonewheel organs generate sound by mechanical toothed wheels, that rotate in front of electromagnetic pickups.
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.
As the magnetism varies, that induces an alternating current (AC) in the coil, which becomes one of the frequencies used in harmonic synthesis. Vacuum tube musical instruments mean electronic musical instruments generating sound with vacuum tube-based electronic oscillators.
Two models in Church-styled cabinet were made under military specifications, and named G (G for "Government contract", with chorus), and G-2 (with vibrato), to be installed in chapels and officer's messes of U. Hammond Organ Company commercialized it in the late-1930s as Novachord (1939–1942) and Solovox (1940–1948).
Examine the speakers and write down the number codes written on them.
Transistor spinet organ with drawbars, in some extent, corresponded to a kind of successor of L-100 series tonewheel spinet organ, although its new drawbars arrangement is slightly exotic; its upper manual has normal nine drawbars; on the other hand, lower manual has only two 8' drawbars with sawtooth.
This anomalous design was only followed by a few models (8000 series, 8100 series, and 8200 Aurora series).
Monophonic attachment keyboard instrument, intended to accompany the pianos with lead voice of organ and orchestral sound.
It consists of two units — a 3-octave mini keyboard attaching under the piano keyboard, and a tone cabinet including electronic sound generator, amplifier and loudspeaker.