Motion Sound KBR-3D Specifications download pdf (Page 7)

Motion Sound currently uses an Electroharmonix 12AX7EH tube. Motion Sound recommends

replacement with a 12AX7EH, 5751, or 7025. If this is not possible, a 12AX7 can be used if the

gain is adequate.

Belt

The medical grade “pyrathane” anti-static belt is custom manufactured for Motion Sound and will

provide years of service. DO NOT USE other belts, as they will damage the servo motor drive

system. Belts are available from Motion Sound.

Horn Diaphragm

Motion Sound used a proprietary MS-1.2 diaphragm. DO NOT USE other diaphragms. You can

purchase the MS-1.2 through Motion Sound.

-Internal User Adjustments-

The dynamics and speeds of the KBR-3D’s horn motor and low rotor simulator are calibrated at

the factory to simulate a 147 type rotary speaker that is well used but maintained. Three

parameters of the horn and low rotor simulator may be adjusted to user preference as follows

(note original position of potentiometers before turning). The controls for the horn and simulator

are labeled:

S = Slow speed

F – Fast speed

A = Acceleration

The adjustments are labeled on the PC board. To access the adjustments see amplifier removal

information.

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Motion Sound KBR-3D Specifications Page 7