Hammond L series User Manual

L
1
,
is
about
32
cycles
per
second,
and
the
^
highest,
number
9
1
,
is
about
6000
cycles
per
second.
Frequency
numbers
1
to
1
3
are
used
only
for
the
pedals;
numbers
14
to
17
are
omitted;
and
numbers
18
to 91
are
used
for
the
manuals.
Figure
1
-6
showing
filter
locations
also
shows
the
termination
point
i
»
of
each
frequency,
while
Figure
5-1
shows
typical
tuned
and
untuned
tone
generators.
I
^
In
case
any
generator
frequency
is
weak
or
[
absent,
refer
to
''Practical
Service
Sugges-
tions"
for
the
procedure
to
be
used
in
locating
and
correcting
the
trouble.
1-5.
MANUALS.
-
Musical
frequencies
from
the
tone
generator
go
through
the
manual
cable
to
terminal
strips
on
the
two
manuals
and
from
them
to
the
key
contact
springs.
Each
of the
two
manuals
has
44
playing
keys,
or
approximately
SVi
octaves.
The
two
manuals
do
not
cover
exactly
the
same
pitch
range,
but
they
are
arranged
so
that
keys
of
like
pitch
are
in
line.
Middle
"C" is
the
first
C
on
the
upper
manual
and
the
key
in
line
with
it
on
the
lower
manual.
Under
each
key
are
a
number
of
contact
springs
(for
the
fundamental
and
harmonics
of
that
key)
which
contact
an
equal
number
of
busbars
when
the
key
is
pressed.
All
contact
springs
and
busbars
have
precious
metal
contact
surfaces
to
avoid
corrosion,
and
the
manuals
are
sealed
to
exclude
dust
so
far
as
possible.
In
case
a
contact
becomes
dirty
in
spite
of
these
precautions,
a
busbar
shifter
is
provided
in
each
manual
to
slide
the
busbars
endwise
and
thus
provide a
fresh
contact
surface.
(See
paragraph
4-3b).
Looking
under
the
lower
manual
on
the
left
hand
end
(front
view)
a
black
wood
end
block
will
be
observed.
One
half
inch
from
the
front
of
this
block
is
a
drilled
hole.
Within
this
drilling
is
a
small
metal
tongue
with
a
punched
hole.
Using
either
long
nose
phers
or
a
hook,
this
tongue
can
be
moved
in
and
out
and
it
in
turn
moves
the
busbars.
The
upper
manual
shifter
is
in
a
similar
place
and
access
to
it
is
from
the
rear
of
the
console.
The
key
contacts
are
connected
through
resistance
wires
to
the
manual
terminal
strips.
The
manual
wiring
chart.
Figure
1-7,
shows
how
the
contacts
of
each
key
are
connected
to
the
proper
frequencies
to
supply
the
fundamental
and
harmonics
of
that
particular
key.
The
blank
spaces
indicate
that
no
key
contact
is
used,
inas-
much
as
the
higher
harmonics
of
these
keys
are
not
required.
Since
the
percussion
control
circuit
is
keyed
through
the
6th
harmonic
busbar,
the
blank
spaces
in
this
row
have
contacts
connected
to
ground
through
resistance
wires.
The
busbars
of
each
manual,
each
one
carrying
a
certain
harmonic,
are
wired
to
the
appropriate
harmonic
drawbars
for
that
manual
through
the
"Drawbars"
tab.
NUW&ERS
ON
FILTER
TRANSFORMER*.
ARE
FRE.QUENCY
NU^ABERS
OF
TRANSFORMERS
SYNCHRONOUS
MOTOR
END
FILTER
TRANSFORMERS
42
78
18 S4
^5
71
II
47
28
61
4 88
81 21
57 36
74
50 43 79
19 S5
36
72 ,2
48 29 65
5
69
82 22
58
i3_75
5l_32^
68
8
44_25_6I__^
8S
30
£6 6
90 83 23
59
40 7«,
52 3i
69
o
.
o olE
Q o
6
nTro o 'o'o'o' o'o'o"
o~cro~o"oo"
<-3
o
Q "o
l
!o o
o'
o
b o o
boo
o
6
o
6"o o
o
o o o o
o o
d||o o o"o^
o o o o
b o.
9
45
26
62 2
8fe
3» 67
7
91
84 24
60
41
77
53 34
70 10 46 27
6 3
3
87
80 20
56
OUTPUT
TERMINAL FREQUENCY
NUMBERS"
b
oboooooeo
o-o-c
.
37 73 13
49
^
Figure
1-6.
Filter
Locations
and
Frequency
Terminations
on
Generator
Cover
1-5

Hammond L series Specifications

General

Brand	Hammond
Model	L series
Category	Musical Instrument
Language	English