5-60. A portion of the output of transistor TR-1 goes to double triode tube V4, which
is connected as a phase splitter to drive the push-pull bass channel. The output of
V4 goes to the bass reverberation switch, which is also connected to the input
terminals G1 and G2. The bass channel receives a large amount of reverberated signal
along with some direct signal in the HI position, only non-reverberated signal in the
OFF position, and varying mixtures in the intermediate positions.
5-61. A filter network following the bass reverberation switch filters out signal
frequencies above 200 cycles. Following it is a room size switch which can be used to
provide better balance by reducing the bass volume when used in a small room. The
signal then feeds push-pull tubes V5 and V6, which drive the bass output tubes V7 and
V8.
5-62. REPLACEMENT OF COMPONENTS
5-63. TONE GENERATOR ASSEMBLY
5-64. Remove the four hexagonal-head bolts and their associated springs and T-washers
which secure the generator assembly to the console.
5-65. Remove the four screws from the left and right hand side panels of the music
rack. Tilt the bottom of the music rack by lifting the side panels, and remove the
rack by pulling outward.
5-66. Remove the 4 chassis bolts (underneath the console) and the 2 machine screws
(under the front lower manual rail) that hold the entire manual chassis in place.
5-67. Disconnect the 79 manual leads, 68 pedal leads, 4 ground wires, and the pedal
filter leads. The pedal filter is located on the rear surface of the upper manual
assembly.
5-68. Pull out all drawbars to position 8, and then tilt the manual chassis from the
front as far as the top of the console will permit. Place suitable wedges or blocks
on both sides of the manual chassis to hold it in this position. The manual chassis
must be tilted to provide adequate clearance for the bolts in the comers of the main
generator assembly.
5-69. Unhook the four suspension springs on which the generator assembly rides.
5-70. Lift up the generator assembly and remove it at the rear of the console.
5-71. Install a replacement generator assembly by reversing the procedure given above
for removing it.
5-72. MIXING TRANSFORMER ASSEMBLY. The Assembly of two mixing transformers is
provided complete with all leads to the preset panels, and can be removed as follows:
a. Remove the rear panel.
b. Remove the two screws which secure the transformer cover in place.
c. Label and disconnect all leads from the mixing transformers where they
connect to the preset panels.
d. Unsolder green and yellow shielded wires at mixing transformers.
e. Remove the two wood screws which secure the mixing transformer assembly to
the manual chassis block.
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