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.
