Hammond L series User Manual

MAGNET-
COIL OUTPUT
TERMINAL
ONE
SIDE
OF
COIL
GROUNDED
-TONE
WHEEL
COIL
Figure
1
-4.
Typical
Tone
Generator
-3.
-4.
MOTOR
AND
POWER
SWITCH.
-
The
tone
generator
assembly,
in
which
all
tones
of
the
organ
originate,
is
driven
at
constant
speed by
a
self
starting
synchronous
motor,
operating
at
1800
RPM,
located
at
the left
side
(rear
view)
of
the
console
(Figure
1-2).
(In 50
cycle
organs,
the
generator
speed
is
1500
RPM).
A
toggle
switch
(Figure
1
power
to
the
organ.
-1)
controls
TONE
GENERATOR.
-
All
tones
of
the
organ
originate
as
electrical
signals
in
the
tone
generator
assembly.
It
contains
87
tone
wheels
having
various
numbers
of
teeth,
with
suitable
gears
for
driving
them
at
various
speeds
from
a
main
shaft
extending
along
the
center.
Each
pair
of
tone
wheels
is
mounted
on
a
shaft
and
between
them
is
a
bakehte
gear
held
by
a
coil
spring,
forming
a
mechanical
vibration
filter.
As
the
gear
is
not
rigidly
attached
to
the
shaft,
any
pair
of
wheels
which
may
be
stopped
acciden-
tally
will
not
interfere
with
the
operation
of
the
others.
Adjacent
to
each
tone
wheel
is
a
magnetized
rod
with
a
pickup
coil
wound
on
it.
These
magnets
extend
through
the
front
and
back
of
the
generator,
and
are
held
by
set
screws
which
can
be
loosened
in
case
adjustment
is
ever necessaiy.
Figure
1-5
shows
the
location
of the
magnet
for
any
frequency
number.
In the
illustration
the
dotted
lines
indicate
frequencies
whose
tone
wheels
are
on
the
same
shaft.
On
top
of the
tone
generator
assembly
are
small
transformers
and
condensers,
forming
tuned
filters
for the
higher
frequencies.
They
are
not
likely
to
need
replacing.
In
case
one
filter
becomes
inoperative,
both
the
transformer
and
condenser
must
be
replaced
with a
matched
set
from
the
factory.
Figure
1—6
shows
the
location
of
^
these
filters.
A
few
frequencies
use
untuned
filters
consisting
of coils
alone.
Wiring
from
the
various
filter
assemblies
leads
to
the
terminal
strip
on
the
long
edge
of the
generator.
The
output
frequencies
of
the
tone
genera-
tor
are
numbered,
for
convenience,
in
order
of
increasing
frequency.
The
lowest,
number
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60
(56)
g)\
e
SYNCHRONOUS
MOTOR
CNO
BACK
OF GENEBATOR
(AT BACK
OF
CONSOLE)
SyNCHRONOUS
FRONT
OF
GENERATOR
MOTOR END
DOTTED LINES
SHOW
FREQUENCIES
WHOSE
TONE
WHEELS ARE
ON
SAME
SHAFT
Figure
1—5.
Magnet
Locations
on
Tone
Generator

Hammond L series Specifications

General

Brand	Hammond
Model	L series
Category	Musical Instrument
Language	English