Figure 1: Typical Console Manual (B2)
For a description of controls - see Section 2
Manual Chassis Assembly - Models A, AB, AV, BC, BCV, BV, C, CV, D, DV,
G, GV, RT.
The manual chassis assembly, figure 1, which includes the upper and lower
manuals and the preset panel, has a terminal strip under each manual made
up of 82 or 91 terminals, depending on the generator being used, to
accommodate the frequencies from the tone generator assembly. Each manual
has 61 playing keys, 9 preset keys, and 2 adjust keys, each of which operates
nine small bronze contact springs with precious metal points (See figure 2).
When a key is pressed these points make contact with nine busbars extending
the entire length of the manual. The busbars also have precious metal contact
surfaces.
The nine contact springs under each key carry the nine harmonics of the
particular note with which they are associated (See figure 3) and are
connected by resistance wires to the proper terminals on the terminal
strip. Therefore all key contacts are alive whenever the generator is
running. See schematic diagram of console in the Diagrams & Schematics section.
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