Hammond Model A, Руководство пользователя, Страница: 146 / 298

CONCERT MODEL CONSOLES
(Pedal Solo schematics referenced here
will be found in the Wiring Diagrams and Schematics section.
Block diagrams can be found in General Descriptions)
The Model RT Hammond Organ console is similar electrically to the Model CV console,
but differs in the following respects:
1. The console woodwork is larger and somewhat different in depth.
2. The pedal keyboard is concave, with 32 pedal keys.
3. The pedal solo unit is added to provide deep and rich pedal tones
desired by the concert organist.
The Model RT-2 console includes the above feature and also has the selective vibrato
system as used in Model C-2.
The Model RT-3 console is similar to Model RT-2 with the addition of the percussion
feature.
The Model D-100 console is similar to Model RT -3 with the addition of a built in
power amplifier and speakers.
PEDAL SOLO UNIT
The pedal solo unit incorporated in these consoles provides a series of bright pedal
solo tones in addition to the usual pedal accompaniment tones available on other
models. The pedal solo tones, generated by a vacuum tube oscillator circuit, are
controlled by a volume control knob and eight tilting stop tablets, of which one
turns all the pedal solo tones on or off and the others provide various pitch
registers and tone colors. The pedal solo unit is independent of the electromagnetic
tone wheel generator and can be turned off without affecting the remainder of the
organ.
Only one pedal solo note will play at a time (if two pedals are depressed at a time,
only the higher one plays) but this does not affect the foundation or accompaniment
tone controlled by the two pedal drawbars. It is possible therefore, for the left
foot to play a bass accompaniment note set up on the pedal drawbars. while at the
same time the right foot plays a pedal solo note (the accompaniment tone on this
higher note being masked by the high solo quality).
The pedal solo unit is designed as a part of these consoles. and because of
mechanical limitations it is not adaptable to any other model.
NOTE: Pedal solo generators of all types have slightly different electrical circuits
but are interchangeable in all RT & D-100 series consoles. Type RTA was used in
all Model RT and some Model RT-2 consoles. Types RTB and RTC were originally
used only in Model RT-2. Types RTD and RTE have improved components - but no change
in circuits.
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