Hammond ModelsSS1S4 Service Manual
SERVICE
INFORMATION
THE
ON
HAMMOND CHORD ORGAN
S-4)
and
S-1,
(Models
S,
I
^
G.M.
HAMMOND ORGAN
mAJL^AjcX ftuyii qWxtCKA^v
7-65
voiee
HAMMOND
DIVERSEY
WEST
4200
ORGAN
AVENUE
'
CHICAGO
COMPANY
39
ILLINOIS
PRINTED
IN U.S.A.
CONTENTS
Page
^§^
-
Figure
General
Installation
Special
1
Description
Equipment
Front
View
Maintenance
and
Musical Terms
Notes and
Figure
Tone
Melody and
Attack,
Vibrato
How
the Chord
Octaves
-
2
Arrangement
Qualities
Acconnpaniment
Decay,
Organ
Turning On and
Musical
Figure 3
Expression
Control
How
the Chord
Figure
Description
Divisions
-
Chord
Control
Tablets
Organ
-
4
Simplified
Electrical
of
Keyboard
Vibrato
Solo Oscillator
Frequency Dividers
Solo
Solo Register Controls
Solo
Tone Controls ....,
Solo
Control
Tubes
"Organ" Oscillators
XDrgan" Controls
Chord Oscillators
-
Figure
Figures
Figures
Chord
5
Complete
6A,
6,
7A, 7B
7,
Buttons
Mute
Chord Control
Sustain
Figure 8
Pre
amplif
Cancel"
-
Chord
ie r
.
Bass Pedals
Pedal
Pedal
"Volume
Expression
Power Output
Frequency
Control Tube
Soft"
Control
Stage
Power Supply
Description
Generator
Organ
Keyboard
Keyboa
of Components
Assembly
Oscillator Assembly
Chassis
rd •
Sustain,
Played
is
Off
Buttons
and
Works
Block
6B, oC
-
Wiring Diagrams
Tube and
Button
»
Dividers
Unit
•..
Keys
of
Accent
and
Balancers
Block
Circuits
and "Solo
Diagram 13
-
Schematic
Chord
Chart
i
in an
Diagram
Woodwinds"
Bar
•
Octave
Circuit Diagrams
«
^
.••..••.••
4
.«..
•••
Separate
Separate
• •
5
5
5
5
5
5
6
6
6
6
6
7
7
7
8
8
9
9
10
10
10
10
11
11
11
11
12
12
12
14
14
14
14
15
1
16
16
16
16
17
17
17
17
17
17
17
17
^
Sheets
Sheets
9
\
Description
Generator
Organ
Keyboard
Keyboa
Figure
Figure
Figure
Figures
Figures
Figures
Figure
Figures
Figure
Figures
Figure
Chord
Control
Tune
of
Assembly
Oscillator
Chassis
r
d
-
9
-
10
-
11
12,
13,
13B,
3D
1
14,
-
15
16,
-
17
Switch
Assembly
r A
sembly
s
Expression
Pedals and
Power
Figure
Figure
Figure
r
Se
vie
1.
2.
3.
4.
5.
6.
Specific
7.
8.
9.
Specific Service
10.
11.
12. One
13.
14.
15.
16. Solo
17.
18.
19.
20.
Pack
-
18
-
19
-
20
Ope ra
e
tion
Tubes and Other
Busbar
Contacts
Adjustment
Tuning of
Tuning
Service
Entire
Vibrato
Radio Frequency
All Solo
and Organ
Solo
Key
One Key Plays
One
Solo
All
Solo
Key
One
Solo
"Bass" Does Not
Solo
"Bass" Does
Solo
"Bass"
Solo
Components
Assennbly
Back
View
Generator,
Keyboard,
-
13A
13C
Inside
14A
-
Generator
-
Inside
-Inside
of
-
Wiring
Oscillator
Inside
12B
-
Organ
16B
Underside of
Control
Pedal
Chord
Pedal
Power
Shifters
of
and
Switch
Switch
Switch
Pack
s
Control
on
Solo
of
Individual
Individiial
Suggestions
Instrument
Effect
Completely
Suggestions for
Notes
Fail
Divisions
Will Not
Lowest
Timbre
Notes
Fail
Thumps
Register
and "Tenor"
Tuner,
Chord
and
Switch,
Generator
of
Generator
of
Generator
Control
of
Assembly
Organ
of
Keyboard
Power
Electrical
Switch
Tablets
Tuning
Organ
Solo Notes
Fails
Oscillation
Play
Control
or
Control Does
Not
to
Solo
Are
or
a
"F"
One
for
Clicks
Play
Play and
Will
Solo Note
Control
and
Assembly
Oscillator
Connponents
Chord
and
Play
Missing
Division
Weak
Fail
Solo
Will Not
Position
at All
or
Note
Not
"Tenor"
"Solo
Play at
Not
are
Exposed
Balancers
Assembly
Notes
Weak
Turn
Off
"Solo
of
Play
Does
Woodwinds"
All
Page
17
•••
1^
17
17
1
18
19
Exposed
20,
21A,
*.
19
20A
53
55
57
59
21
22
23
•
•
•
• •
2
23
••
23
23
23
2
24
-
25
25
2
26
26
26
•
26
2
27
28
28
28
28
•
28
28
Woodwinds" 29
with
Play
Not
off 29
28
29
29
29
29
29
29
29
'
3
3
6
7
«
«
?
:
r^^
4
FIGURE I
Models S,
:^
I
operation.
Model
6SC7 frequency
Model
values
different
Model S-4
of
circuit
details
Information
necessary,
6A, 6B,
6,
and
mentioned in
Note
that
other
models
S-1,
S
uses
divider
S-1 has
from
has
from
several
6C are
the
text,
figures
differ in
and
octal
miniature
Model
miniature
Models
in
this
circuit
schematic
it
1,
various
S-4
tubes
tubes
book
diagrams
will
9,
-
are
almost
and
which
tubes
S.
tubes
S and S-1,
applies
diagrams
be
understood
and
10,
details.
FRONT
one
were
VIEW
OF
exactly alike in
12 inch
later
and
one
12 inch
and
two 10
and
has slightly
to
all
naodels unless
speaker. The
or other figures
for
various
that it
11 are
views of
CHORD
replaced
speaker, and has
inch
speakers. It
are
refers to
a typical
ORGAN
appearance
first units
with
type
and
6SN7
used
tubes.
some component
differs
different
otherwise stated.
supplied; for instance,
models. Where
all
Model
woodwork.
figure 6
of these figures.
S
instrument,
nnusical
type
in
a number
Where
figures
is
and
An
^
m
•
The
has a
with
ed
to
accent
tablets
justing
to
regulate
Hammond
37-note
the
left
chord
for
controlling
the
volume
the
Chord
keyboard
hand;
rhythms;
of
volume
a
the
the
of
chord
played
GENERAL
Organ
with
bar
two
bass
character
various
the
entire
DESCRIPTION
is
completely
the
right
operated
pedals
of
tones
divisions;
instrument.
hand;
by
the
played
produced;
and
self-contained
a
set
of
96
palm
with
a
knee-operated
or
the
thumb
left
three
(see
figure
chord
foot;
of
the
twenty
buttons
balancers
expression
left
for
l).
play-
hand
stop
ad-
control
It
wHivif°
which
The
IS
power
frequency
must
remain
The
ting
a
radio,
Chord
Organ
The
formation
Notes
and
Keyboard
with
sequence.
keyboard,
the
The
'^aturals'^
7
next
octave
install
packed
source
indicated
within
^'Owner's
phonograph,
.
service
helpful
Octaves
The
and
lower
shown
the
Chord
with
the
must
on
the
the
Service
man
who
in
studying
instruments
(white
pitch
each
octave.
starts
keys)
or
note
Figure
INSTA1.1.ATION
Organ
console,
be
name
indicated
it
is
and
alternating
plate.
range.
necessary
to
SPECIAL
Suggestions"
microphone,
MUSICAL
has
had
no
musical
the
operation
are
divided
and
5 "sharps"
frequency
has a
with
increases
frequency
shows
2
C,
but
an
AND
current
The
MAINTENANCE
plug
the
of
frequency
Oiling
EQUIPMENT
booklet
extension
TERMS
training
of
the
into
"octaves"
or
smoothly
twice
the
octave
that
appearance
may
only
to
attach
line
cord
the
approximate
need
is
not
required.
gives
fuU instructions
speaker,
will
instrument.
of
'Ylats"
(black
from
of
the
of a
start
the
music
into
a
wall
voltage
not
be
constant,
or ear
find
12
keys
keys)
left
phones
the
following
or
notes,
in
to
right
corresponding
with
typical
any
octave
key.
rack,
outlet.
for
to
a
definite
on
note
and
but
connec-
the
in-
each
the
in
of
keys.
^
K\
FIGURE
C# D#
fOR\ fOH
-ARRANGEMENT
2
ONE
F#
OCTAVE
OF
G#
PLAYING
A#
KEYS IN
AN OCTAVE
Black
venient
between
greater
any two
from A
the
of
C# (C
keys
way to
a black
than
adjacent
G.
to
above
note
sharp)
occur
identify
key
frequency
the
keys
black
A
it;
Db
or
in groups
the
a
and
called
is
key
instance,
for
flat).
(D
of
notes of
white
may
of
one,
the
a
be
and^three
two
octave.
the
since each key
below it.
one
next
semitone.
called a
the black
"sharp"
key
each
in
Technically
has
white
Each
of
between
a
The
the
octave
there
frequency
musical
key is
note
C
called by
below
and D
offer
and
is
no
6
interval
it or
may
a
con-
difference
percent
between
letter
a
"flat"
a
called
be
Tone
certain
like
fundamental
are
'
1
!
harnnonics
the
by
"Solo
Melody
companiment
A group
Attack,
pressed,
to
"accent"
iment; for
that of a
Qiialities
Any
"tone quality"
tone
multiples
pitch of
the
In
controls
such
Timbre"
and
Music
of
Decay,
"Attack"
effect
the
is the
musical
contains
note
only
frequency
the
of
independently,
fundanmental.
the
Chord
Organ the
as
tablets.
Acconnpaniment
requires not
consisting
notes
which blend
Sustain,
describes
and "decay"
a chord
of
effect
instance,
banjo
string
a definite
has
"timbre"
or
a single
also
but
fundamental
instead
but
tone
'Mute",
"Strings",
a melody
only
additional notes
of
harmoniously
and Accent
promptness
the
describes
sounding
which
by
a
note may be
a
being plucked.
fundamental
depending on
frequency.
nnore
or
one
frequency.
identifies the
qualities
Tlutes",
(one note
with
rate at which
the
softly
solo
while the
note is
accented by
pitch
its
A complex
^liarmonics"
ear does
The
various
the
of
"Solo
played
which
when
which
are
played
it fades
chord
made
giving it
frequency
or
wave
shape.
tone
or
as
note
divisions nmay be
Woodwinds",
at
harmony
in
together
soxinds after
note
a
away.
bar is
stand
to
a percussive
A
includes
"overtones",
distinguish
not
a connplex
a
time)
is called
"Sustain" refers
held
not
from
out
and
simple
not
tone
and the
but also
with the
a
down.
the
attack, like
also a
flute-
the
only
which
the
having
changed
five
an
ac-
melody.
a chord.
is
key
An
accompan-
.1
rA
Vibrato
The vibrato
rate
of
violinist
pitch
the solo
refer to
but
In the
This
find it worth
will
strument
may
that
about
six
"wiggles"
maintaining
Chord
division the
the extent
effect
times
his
Organ the
of
HOW
created by
is
a second. It
finger
constant
vibrato effect is
extent
pitch
of vibrato is adjustable.
variation.
THE
back and
instrument is remarkably
is played
while
will
study
to
found very
be
occur.
loudness.
CHORD
easy for
the
playing
a
periodic
comparable
is
forth
on
ORGAN IS
controls.
helpful in
raising
a string
available
PLAYED
anyone to
locating
lowering of
and
effect produced
the
to
while playing,
all tonal
on
terms
The
play,
A
and the service
knowledge
source
the
divisions.
"small"
how the
of
of any
pitch
at a
when
varying the
On
and 'Wide"
man
in-
trouble
a
«
-
Turning
To
the
right.
The
volume
swing
the lever
Musical
The
with
the
variety
only
one
the
highest
The
sanne
to play
As
the
greater
It
the
solo
keys.
is
The
furnish
button
is
played
chord
made
selects
played
with
buttons,
louder
The
so\ind
different
the
On and
turn
Off
on, swing
A pilot
light
increases
to the
Divisions
"Solo"
right
of
note
"Organ"
full
often
melody
division
volume
Chord
Division
hand.
tonalities in
at
a time.
one
will play.
Division
Its
tones
chords with
desirable
note
is
and
on the
Division
accompaniment
a full
at
a
time.
the
palm
(if
the
by
pressing
Pedal
deep
notes
Division
bass
for
each
the
expression
above
as
the lever
left and
is
played by the
It is
used
all
pitch
If
several
is
independent
augment
the
right
to use
usually
can
be
emphasized
solo division.
has
96
to harmonize
chord
The
or
notes
(along
chord
thumb
"Sustain
the
has
two
selected
chord
chord
control
the keyboard
is plpshed
upward
until
keyboard
practically
registers.
keys
are
those of the
hand.
both the
the
highest
solo
by using a
Chord
division
of
Cancel"
bass
in
Buttons
with
with
the
the left
bar.)
pedals
by
the
order
also
tablet
to give
lever (see figure
indicates when
farther
the switch
to the right. To
and
all
of the time
As
its name
held
down
the
of
solo division
solo division and
and organ
one
played, it will
contrasting
played with the
,
the
melody (see
acconnpanying
includes
hand
to
sound the
is
off, the
which are
chord
buttons. The
tonal
variety.
the
clicks.
is
used for
as
innplies,
at once,
divisions
figure
bass
the
Chord
chord
chord
played
downward
1)
instrument
turn
playing
it has
but is played
also
be the one
note),
with the
two
this
the
make
at
tone
left
hand,
3).
Bar
selected
sotinds
pedals
the
division
solo
the
quality
As
only
which
,
softly
left
and
is
on.
off,
a
melody
greatest
plays
note
of
by the
it possible
same
played
time.
by
and
which
each
one
button
is
by the
but is
foot to
play
two
to
only
MAJOR
+6TH.
NINTH-
MAJOR-
MINOR-
SEVENTH-
DIMINISHED-
AUGMENTED
MINOR
7TH
FIGURE
—
3
-CHORD
FOR
At
Db
I
1
BUTTONS,
LOCATING
Eb
1
O
o
o
o
o
O
O
O
CHORDS
i
SHOWING
IN
BUTTON
KEY
OF
C
CAPS
IN
POSITION
6
9
m
m?
^^^
j
'I
^t
H;:
Balancers
Expression
The
board. It
entire
The
'^pedal",
wording on
the
Control
The
attack, decay,
and the
pushing
'
Volume
reducing
great beauty.
of
Control
Expression Control
operated by
is
instrument
three
"organ",
Tablets
twenty
and
effect
them
of
in at the
Soft"
the volume
when practicing,
expression
The
"Sustain Cancel" removes the
when only a
ground
of the position
its
full volume.
'Mute"
"Pedal Fast Decay"
is used, the bass tone fades away very
The
lets control the tone quality
board.
tablet
and pure
The
controls
bottom.
cause
"Organ
chords
With both
effect
"Solo
in at the
Small" in at
heard
The
pitch
"Tenor"
octave.
in
one
range
octave
of these
control.
Accompaniment Controls
chord
rather
than to
makes the
"Organ" Tone Quality Selectors
When
neither is
produces a very brilliant
tone,
'Vibrato
because
They
the vibrato
are
and
well as
as
in the
on
solo
With both pressed
top.
solo
the
Register
Solo
the solo
of
moves
These
relations
controls must be
The Tone
the
of
ily. The
solo
attack of the
solo tones from
particular tone
tinmbre
"Solo
controls used.
Fast Attack"
solo
melodies such as ballads.
very prompt
and
and
the
as well
as
Balancers are
and
"solo"
all the knobs
control
vibrato of the
chord bar.
the
divisions.
is
tablets or "stop"
bottom
This tablet
.
entire instrument,
also
It
of the
may
as it reduces the
button is pressed.
it because the
add
this
of
control,
chord
is used to
of
used, the
and
Cancel"
they
is
Chords",
the
"Solo
division
the
division.
together
both
remove
arranged
usually
when
"organ"
Small" and
top,
Controls
to
desired.
is
and
Controls
division.
them one octave
controls may be
similar
Familv
to
Selector
string
the
qualities
and 'Solo
division
is
When "Solo
useful for
is
lever which
the
is
to
knee, and
turn it
right
used to
horizontal.
various
They are turned
that the
so
supplements
be used to advantage
volume while
-
relatively
pressing
button tones more
obtain
the "organ" division,
"organ" division
tone,
give
.
vibrato
the
cancel
pressed
division.
"Solo
cancelled. To
for a
medium
in at the top,
-^Bass",
"Bass" places
higher; and
used
effect obtained
the
in order to
used
-
'*So1q Woodwinds".
brass
or
within
Accent".
very
fast
smooth
nnoving
extends
serves to
and off.
on
volume of
adjust
The best
the
balance
visible.
is
the
control
tablets
divisions,
dot
and
as
"on" to
action of
may
when
maintaining
"Sustain Cancel",
tonal
soft
It
arranged
is
background
the
chord
a nnore
rapidly
-
"Strings"
'Flutes"
the
a
full
rich
The word
effect
vibrato
the
in
at
Wide"
pressed
get
solo
"Tenor",
"Soprano"
in combination
family
these
When
and
Fast
Attack"
melodies.
8
background
bar
mellow.
percussive pedal tone. When it
whenever
will be
tablet supplies
quality.
"cancel"
when
effect
bottom,
the
a small
vibrato,
nnaximum
the
'"Soprano".
the solo
all
with
obtain
to
groups
two
neither
well-suited
is
from
regulate
is
the pitch
well as
give the
be
playing in a small
'TVTute", '*Pedal Fast Decay".
cancel the sustained
to
usually desired.
is
causes the chord to
underneath
the
voliame of the
produced
tone
generally
range,
overall volume
the
indicated effect
expression control by
the
used to
obtain soft music
full range of
the
which
by
obtained when
tone quality^
is produced
Regardless
a pedal
is released.
the key-
the
room
the
back-
sound
and 'Flutes". These two tab-
which is played from the key-
silent. The "Strings"
a
very mellow
used
is
are
they
rather
cancels
the
in at
solo
press
moves
produce
to
organ
solo
a
tablet
This
clarinet or
the
are
control
used,
is
When "Solo
in the
pushed
than to
the
bottom,
vibrato,
only
vibrato
These
tones
in a low
them up
a
chorus
couplers.
tone.
changes
determined
is used, the
playing slow
for
the attack
Accent"
name of
in
add
vibrato of
vibrato
the
-press
"Solo
effect
control
additional
an
At
the
woodwind
beconaes
these
the
at
be-
it
only
Wide"
is
the
register
tones
of
least
quality
fam-
the
by
tonal
moving
used
is
the
by
or
at
m\h
the
attack
releasing
The
Voice",
of
the
solo
controls.
type
of
flat
and
the
750 cycle
beautiful
and
gives
bmations
trols
must
is
one
Solo
and
division
"Deep
tone,
gives
solo
a
to
be
so
rapid
note
before
Timbre
"Brilliant".
to
Tone"
while
zone
piercing
produce
"Full
a
generally
and
voices
used
in
as
to
appear
playing
Controls
These
modify
emphasizes
Tone"
useful
"Second
of
the
horn
quality.
a
great
order
-"Deep
five
the
leaves
bright
Voice"
type.
These
variety
to
obtain
percussive,
the
next one.
Tone".
tone
controls
quality
the
of
low
the
frequency
quality.
puts a
'Brilliant"
controls
of
effects.
a
solo
and
accents
Tull
the
Tone",
alter
tones
frequencies
characteristic
'First
resonance
emphasizes
can
be
used
At
least
tone.
may
"First
the
frequency
selected
to
provide
Voice"
near
singly
one
by
puts a
1000
the
of
the
be
produced
Voice",
characteristic
the
Solo
a
pure
essentially
resonance
cycles,
higher
or in
five
various
timbre
by
"Second
Register
mellow
in
producing
frequencies
com-
con-
All
tones
mixed
block
and
diagram
As
figure
generating
on
the
setting
may
be
regulated
Accompaniment
ected
chord
The
trolled
the
with
bar,
functions
by
relative
Tones
volume
£o
QUJ
by
GENERATING
SYSTEM
of
amplified
of the
4
systems.
of
the
chord
while
of
various
pedal
of
all
the
expression
SOLO
HOW THE
the
instrument
by
additional
entire
indicates,
Tones
the
corresponding
with
the
tones
buttons.
the
pedals
the
chord
control
voliime
the
divisions
instrviment.
the
playing
from
balancer
originate
The
play
button
tablets.
is
regulated
are
control
KEYBOARD
CHORD
are
generated
vacuum
either
control
knobs.
in
chords
the
correct
system
There
combined
before
ORGAN WORKS
by vacuum
tube
circuits.
keys
control
or
both
systems
tablets,
the
chord
selected
bass
and
the
pedal
is
no
balancer
by a
pedal
at
the
being
reproduced
SOLO
CONTROLS
tube
Figure
the
^*solo"and
may
and
the
generating
are
sounded
notes
balancer.
to
system
for
amplifier
oscillators
4
is
"organ"
sound,
relative
volume
system
by
pressing
harmonize-
are
separately
the
chord
and
are
by
the
loud
and
a
simplified
tone
depending
and
are
with
the
system,
regulated
speaker.
are
levels
sel-
the
chords.
con-
but
in
m
I
LU
^0^
21
LiJ
ui
or
O
u
<
GENERATING
r
Q-
O
GENERATING
o
?
<
-J
CL
ORGAN
SYSTEM
CHORD
SYSTEM
FIGURE
CHORD
BUTTONS
4
-SIMPLIFIED
PEDALS
ORGAN
CONTROLS
CHORD
CONTROLS
PEDAL
CONTROLS
BLOCK
DIAGRAM
AMPLIFIER
EXPRESSION
CONTROL
SPEAKER
DESCRIPTION
ELECTRICAL CIRCUITS
OF
When studying this
which
circuits are indicated by lines without
figure 6 (pages
the parts
also to refer
and other connections
to
are
39-41
the
section refer
connected
-43-45),
wiring
diagram, figure
between
arrows showing
by
shows all circuits in detail. It
parts
Keyboard
Four
and
control
for
the
bars
use
only
closes,
and
causes
The
keyboard
prevents
use
of this
Vibrato
A single
instrument.
figure
of
has
tube
and disconnect
two
solo
position
The organ
tube cathode
thode
sets
of
contact
contacts
"organ"
extending
three,
tuning
the
busbars
can
a
contact
busbar
It is
giving
6),
a
square
division.
the
to the
note
be
low
small
for
the
length
as
shown
desired
to
sound.
are
movable
turned
to
from
shifter.
closing.
frequency oscillator
composed
a
frequency of
wave output and
condensers across
vibrato switches provide
and
maintain
chord
described
as
by
the
in
is
grounded
order to
circuit
springs
These
of the
in
figure
"Solo"
four
keyboard.
note,
a
short
are
division,
6. The
before
provide a
Refer
a triode
of
about
its
compensating
correct
the
divisions receive
later.
"Organ
and
to
of
operated
rows
complete
the
the
arrows.
the
of springs
tuning
the control contact
The
(pages 47-49-51),
7
instrument.
the playing
by
plus tuning
Some
keys use four
contact
distance endwise,
fresh
contact surface in
to the
provides
tube in
6
plate
the solo
section on "Service
the
phase
a
cycles
circuit
per
oscillator
condensers
mean
frequency
their
vibrato
When the
Chords"
vibrato
block
schenaatic circuit diagram,
diagram, figure
signal
paths.
will
Controlling
found helpful
be
which shows
keys; tuning
contacts and
make
contact with
each
of
of that division
and a
case
slotted stud
control
contacts
division
a
particle
four bus-
and
always
Operations"
entire
the
vibrato
shift
second.
acts
effect
cancel
as a
with
from
is
effect
t\ined
not
tablet.
for
circuit
vibrato
The
switch to
circuit.
in the
vibrato
the
vibrato
the
desired,
left
(see
connect
'Vibrato
this ca-
in
5,
cables
contacts
contacts
some
closes
under
of dust
for
end
switch
The
cancel"
or off.
on
switch
the
Jill
i
Solo
Oscillator
Each
"soprano"
tuning
solo
tuning
tact
the
inductance
shorts
oscillator
pressed
one. The
The
nected
left
to
corner
densers
in
parallel
tuning
capacitance
An
having a
tuning
solo
note
associated
contact), all 37
the
of
out some of these
the higher
to
at
the
same
oscillator
solo
oscillator itself
the first grid.
of figure
across
with
"oscillator
steep
wave
frequencies
the tuned
the
main
to the
rectifier"
front
contact tunes
with
that
solo
tuning coils are connected
oscillator. When
coils (making less total
pitch
tinne, the
solo
extend from
is a
The "Big
tune
the
6)
circuit.
tuning
required
suitable for
entire
condenser
tube
the single
key.
When
any other
solo
the
oscillator
lowest key
key is pressed,
inductance)
associated with that note.
oscillator
will sound the pitch
to
349
2793
two-triode circuit with
Steps"
solo
Several
value.
following
operating the
10
and
division
"Snnall
Steps"
as
small trimmer
(left end
the
of
oscillator serves
first frequency
a unit by placing
figure
to the
is played
in series
If
two keys
pitch
and
of
of
has no
(it
form
to
tuning con-
its
thus
are de-
the
only
cycles per second.
the
tuned
tuning
circuit con-
switches
small con-
condensers
to
6)
bring
furnish
to
divider.
are wired
the
the
the
tunes
higher
(upper
total
waves
Solo
.
Frequency
Dividers
There
acts
as
to
actuate
one
(but
plate
current
Suppose,
off.
Now
affect
uces
the
denly
the
a
positive
second
conducts
applied
first
triode
triode
cut
The
ing
the
put
half
triode
the
plates
Solo
oscillator
and
quency
control
suitable
family
off.
first
cycle.
producing
plate
following
Register
Signals
the
driver
divider
are
if
are
a
driver
a
symmetrical
only
one)
for
a
negative
second
triode
to
the
remains
off
and
next
input
conductive;
Each
of
driver
Controls
for
rectifier;
of
tone
filter
the
"Solo
two
frequency
and
of
it
holds
example,
one,
pulse
through
current,
first
triode
cut
the
pulse
frequency
an
output
each
divider
tube,
the
"Soprano"
those
following
and
a
the
same
circuits
Woodwinds"
pulse
feed-back
these
the
other
input
pulse
which
at
the
its
producing
grid
off.
second
will
and
signal
and
and
for
it;
'tass
frequency
divider
rectifier,
two
triodes
in
that
the
impressed
is
already
plate
of
feedback
through
The
situation
conducting.
act
on
thus
divider
two
one
stage
"Solo
and
rectifier
the
furnishes
output
Woodwinds
register
the
"Tenor"
those
but
two
tablet
stages,
supplying
tripping
can
a
cut-off
first
a
circuit
triode
cut off,
the
first
connection.
negative
its
the
second
input
octave
signals
are
register
for
the
"'following
different
sets
of
is
on,
each
sharp
circuit
be
conducting
condition.
is
on
the
but
triode,
pulse
feedback
is
now
triode,
cycles
therefore
lower
a
"
taken
signal
are
than
taken
fronn
"Bass"
it.
wave
signals
or
of the
including
and
narrow
comprising
at
conducting
grids
will
exactly
are
of
cut
which
The
at its
connection,
is
second
plate.
reversed,
cutting
required
divides
the
preceding
of
rectangular
from
the
master
from
The
furnish
the
register
two
shape;
tones
string family
three
a
time,
and
both
triodes
off
the
applied
insures
it
to
its
input
the
driver
first
from
signals
and
after
triodes.
negative
two
triodes.
for
by
the
second
first.
to
triode
This
then
negative
with
off
again
produce
frequency^n
divider.
wave
and
oscillator
frequency
the
second
to
each
passing
of
the
woodwinds
if
this
pulses
drawing
will
This
the
that
the
and
one
shape
divider
register
tablet
One
Either
is
cut
not
prod-
grid
of
sud-
pulse,
the
first
mak-
out-
One
to
and the
divider
fre-
through
is
Solo
Tone
After
five
tone
on
(that
sizes
quency
cuits
nal
appears
Each
contact
\ime when
Solo
Control
The
pull.
ground
^runH?th"' ""'u'
grounds
When
makes
hode
voltage
Controls
preliminary
controls,
is,
the
the
low
frequencies;
response
which
peak
across
of
these
connected
two
or
Tubes
solo
input
These
the
are
potential
^^i^sX^J^^Mc'^r'^"'
both
the
attack
(caused
amplification
which
switch
essentially
near
an
tone
in a
more
are in
open),
750 and
inductance,
control
volume
controls
transformer
pentodes
while
'''^-
"Solo
and
their
":?'
Fast
comparatively
by
pressing
series
the
signal
"Full
flat;
1000
Tone"
"First
emphasizing
tablets
compensating
are
Tl
drives
are
normally
cathodes
^^^^
Whenever
removing
Attack"
slow
a
key)
by
half
across
develops
has
Voice"
cycles,
(with
used
are
the
and
because
causes
11
of
tube V8,
the
across
only
a
resistor,
and
respectively;
the
the
exception
circuit
at
once.
two
control
cut
off
held
at
about
a
key
is
cut-off
"Solo
bias
Accent"
a
sudden
a
negative
the
signal
a
"Second
higher
to avoid
(or
because
+
65
pressed
and
tablets
decrease
solo
signal
line.
When
condenser
which
leaves
Voice"
and
for
"Brilliant"
frequencies.
of
"Brilliant")
excessive
keying)
their
volts
its
tubes
grid
by
soL
causing
are
off,
in
surge
through
reaches
"Deep
which
are
resonant
increase
circuit
a
voltage
contro!
the
note
condenser
the
positive
the
has
in
the
Tone"
empha-
the
push-
to
the
is
fre-
cir-
sig-
a
second
in
vol
is
at
divider
contact
sound.
C58
cat-
condenser,
»
charges
ection.
until
C60
This
the charge
Operating the
C58.
When the
denser
cathode
the
and
preamplifier
but
voltage
resistor
a
give
signal fronn
The
percussive
negatively,
maintains
in
C60
"Solo
Accent"
"Solo
also connects
(caused
and reduces
effect.
the
tube.
moves
and
cut-off condition
the
through R77.
leaks
off
grid voltage
the
Fast Attack" control
control is
a large
pressing a key)
by
the bias for
control tube plates
on, it
condenser
an instant,
temporarily
an instant
for
eliminates
not only
across
this condenser
this
disconnects
R80.
causing
passes
through
in the
after the key
effect
the slow
sudden
a
For
effectively
note
the
the solo
to
negative dir-
pressed,
is
disconnecting
by
attack
decrease
short-circuits
be loud
at first
balancer
to
con-
in
the
"Organ"
of them
the
never
lators to
range from
permanently
lator requires
a
key is
oscillator.
Oscillators
Each
are used
keyboard
desired
supply
In each
pressed,
of
play
175 to 1396
across
For the
In
across
case of
the
condenser
this condenser
the coil.
connects a third
condenser has
equal capacity.
Each coil
the
other
"
Organ^'
half, as
Controls
these
for
three
played
be
to
the 37
case
tuning
no
for
lower
the
have
may
condenser
a small
may
described
oscillators uses
16
adjacent notes
two
adjacent notes.
together,
organ notes
cycles.
highest
the
entire
the
contact.
control
the
note
lower
the same
oscillator
an
resistor
tuned by sliding
be
tuning
each oscillator,
of
part of
in series
under
each,
It
and
the
for
produced
is
note
coil,
oscillator
The
contact
tuning
the
capacity
serving three
with the one
in series
"Tuning".
a single
triode
and
happens
arrangement
this
keyboard.
by
and so
the
does
of each key
tuning
the
coil.
the
as
notes,
connected
all three
that
so
half of the
and
that
at
adjacent
some
The
tizning
a
highest
not
supplies
contact
The
permanently
one
the
iron
a tapped
and low
high
the
notes
enables
only
frequencies of
condenser
of each
note
plate
however,
voltage
operate,
connects
the
so
tuning
tap.
coil
tap is
nniddle
to
condensers
toward
core
coil.
Most
ends of
are almost
oscil-
16
these
connected
oscil-
to its
a
second
located
connected
contact
This
be
may
away
or
notes
unless
that
across
third
of
from
Ha;
Two types
"Flutes"
and
the
all
of
through
The
voltage
bias
each
of
during
vibrato
tube.
Chord
octave
triode
each vibrato cycle.
The
Oscillators
The six chord
of
with a
supplied by each
string
a resistor R185 to
from the
the
organ
tablets.
oscillators,
decoupling
a
vibrato
tone are
of
The
with
resistor
effect on
(which comes from the vibrato
oscillator
tube.
This
varies
To remove the vibrato
cancel tablet
combined organ
oscillators
frequencies
tapped
gro\xnds
from
coil,
this
signal
are similar to the
175 cycles
each
and
oscillator
signal
connes from
grovuid,
upper end
oscillators
switch
the frequency
grid
return
circuit.
goes through the
(F) to
330
can play either
12
the
each
of
obtained
is
tube
of
effect,
organ
organ
cycles
two
of
selected
and
lower
while the
tuning
by
cathode) to
oscillators
all
the
balancer to
oscillators,
Each one
(E).
adjacent
by the
"Strings"
end of the tuning
flute signal co'mes
coil.
applying a
the
by a
"Organ and
the
varying
resistor
grid
small
Chords"
preamplifier
but cover
a
uses
notes,
using
coils
amount
the
single
two
13
I
f
tuning
way as
with only
no button
notes
each
Chord
condensers of
the
for
six oscillators,
requires two
Unlike
are
oscillator.
the organ
being played or
Buttons
organ
Each of the
chord,
(The
too
as
notes selected
in
high
pitch.
as correct
well
dividers described
The notes
projections
actuators
a different combination
associated
For each
signal) and a tuning
playing
tinuously at
it to
tacts,
for the
the correct
lower
the
as many as four
left and
played
on
96
operate
to
with each button.
chord
the
frequency.) Thus
right pedals.
The 24 contact
six tuning contacts
notes), six left pedal
contact
carries
the
with four
the
chord
pedal signals
The busbars
the
bottom of
contact surface
the section
to
the
on
the
oscillators.
chord
96
for the pedals are the correct
They are lowered to
later.)
pivoted
the required contact springs.
note
contact
note.
higher
springs include
(each of
busbars.
signal
to the
are
chord
in case a
"Service Operations" for
same
capacity.
It is
The
possible
because no chord
adjacent notes.
oscillators,
not.
The signal output
these
oscillators
^
buttons selects
by
notes
the
buttons
for
the
levers underneath the
of contacts.
a
chord
must
signal contact
tune the
(Remember
of its two
tuning contacts, and also
signal
The
the chord
to
pedals.
movable
switch nnay
particle of
frequencies except
each button closes
six
which tunes one
contacts,
tuning
a short
be
the
right
the correct
predetermined
are
Figure
corresponding
that each
chord
and six
busbar
control
distance
moved
prevents
dust
use of
vibrato
make
to
button uses
operate
taken
is
.
; .
:
correct
and left
musical
pedal
buttons.
Each of
shows
8
must
these
of
when
three
additional
two
signal contacts
oscillator to
grounded;
is
endwise,
the
to
this
pedal
and
right or
a
right
tube;
effect
is produced in the sanne
the
more
chord notes
12
than five
continuously,
from the
three or
pedals
by the
four
to
notes but
pitch
by
play
positions
These projections
the
96
chord
the
close
oscillator
oscillators
the
signal
the
and
contact
busbar
and pedal notes
(carrying the
tuning contact shifts
the
four chord
or
contacts to
(one
lower
contacts.
the chord
two
last
a
stud
left to
from
shifter.
available
oscillators and
whether
plate circuit of
notes for that
with
that chord.
of
octaves
small
are two
pedal frequency
the
press
buttons
if it is
operates
oscillator
not already
operates con-
signal con-
select
from each
one
of
oscillator),
its two
They nnake
signal
busbar
busbars carry
extending from
provide a
closing. Refer
fresh
notes
1'^'
"Mute"
The
grid of
naellow by
and
Chord
the chord
S-1 only) it
Bar and "Sustain Cancel"
The chord control tube
voltage
voltage by
^pass to
control tube
tube. THi^
the
"Sustain
the
control tube,
The
bar
applied
the
chord
Cancel" control
chord
"Sustain
contacts.
chord
signal,
collected
control tube.
by the signal
When the "Mute" control
shunting a condenser across this
short-circuits a resistor
in
Models
its
to
connecting
amplifier tube (half
is
normally
rruakes
the
bar then serves
tones sound only wKen
and
the
Cancel"
operation
Its
circuit. Pressing
grid
resistor to ground,
a
V20). Part
of
routed through the
chord
chord
control,
tones sound faintly
accent the chord tones by
to
is
pushed in at the bottom
the
switches
bar
in
series
is
same as descriBed above.
the
chord
with a
busbar of
signal line. In the
maintain
to
S
and S-1
and
"Sustain
is normally
chord
the
the chord
the
of
when the
this
bar is pressed.
signal directly
the
resistor,
14
the
is on, it
signal level
the
substantially removes
bar
signal is then allowed
chord
Cancel"
signal ahead of the chord
control
chord
making
circuit is not
Model S-4
into
shunted across the chord
is
chord switch, goes to
nnakes the tone more
off position (Models
constant.
cut
off
to
by a
the
negative
to
preamplifier
bar is not pressed, and
them
the
louder.
connected,
has
preamplifier
If the
and
no chord
the
S
this
tube.
Button
Notes
in
Chord
Left
Pedal
Note
Right
Pedal
Note
Db6
Db9
Dbmj
Dbm
Db7
Db-
Db4-
Dbm
Ab6
Ab9
Abmj
Abm
Ab7
Ab-
Ab+
Abm
Eb6
7
7
F
G#
F
G#
F
G#
G#
C# E
F
G# B
G
A#
F
A
G#
B
F
G#
F#
A#
G#
C
G#
B
F#
G#
F
G#
G#
C
F#G#
A#C#
,B
D#
C#
C#
E
C#
C#
C
D#
D#
C
D#
D#
D#
C
B
D
E
B
D#
C#
C#
C#
C#
C#
C#
C#
c#
G#
G#
G#
G#
G#
G#
G#
G#
f^l
.
Bass
for
(or
In
IS
As
the
key
the
C
Pedals
pointed
two bass
note) of
case
and
The
other
first,
of
the
carrying
frequency
contact
quency
closes,
dividers
The
last-played
insures
of
the
Pedal
that
pedal
Frequency
The
of
the
scale
the
right
identical
half,
which
Thus
producing
shape
the
signal
the
A
limiter
to
second
IS
of
the
"fifth"
pedal
bass
dividers.
signal
contact
the
decay
pedal
but
pitch
to
the
means
two
dividers
pedal
tube
trip
the
divider
then
fed
out
above,
pedals.
the
chord,
the
C
major
note
notes
selected
pedals
the
corresponding
The
energizing
and
will
contacts
always
correct
tinne.
Di
viders
notes
for
are
the
solo
that
selected
still
frequency
notes
preceding
divider
are
through
each
The
while
chord,
is
G
is
played.
pedal
the
be
of
the
remains
pedal
in
the
pedals
its
output
in
cascade
in
the
properly.
mixed
a
chord
note
selected
the
for
(see
chord
by
the
note
note
pedal
discussed
two
pedals
note
will
by
the
pitch
they
are
dividers.
is
the
lower
frequency
the
pedal
Signals
to
give
tone
filter
button
one
for
example,
button
chord
As
a
from
is
not
control
later.
closed
continue
chord
range
fed
same
the
range
first
the
desired
network
selects
for
the
having
chart,
buttons
pedal
is
the
heard,
tube.
are
mechanically
until
buttons
of the
into
two
Each
one
note
signal
of
divider
from
into
the
the
left
right
cannot
pressed
chord
however,
This
the
other
to
be
and
chord
frequency
divides
of the
two
44
to
establishes
the
limiter,
pedal
the
two
pedal is
pedal
notes
figure
sound
its
switch
tube
pedal
available
pedals
tones.
its
scale
octaves
82
cycles.
tone.
pedal
proper
always
is a
musical
C-E-G,
8).
until
signal
busbar
until
the
follows
interlocked
is
pressed.
for
the
are
the
To
bring
dividers,
input
frequency
but an
below
waves
the
first
The
combined
control
musical
the
"root"
'^ifth".
the
"root"
one
or the
contact
to the
pedal
the
pedal
control
pedal
so that
duration
correct
them
substantially
octave
the
chord
of
suitable
divider,
pedal
tube.
notes
note
closes
fre-
the
This
notes
to
in
lower.
notes,
and
Pedal
+.
to
cL7ef ti'T^'' ^i^"
closed
is
tube
sounds
potential
ancer
signals.
"Volume
the
the
sponse
Control
Models
^"^
..
Its grid
by
K.:
the
greatly
In
Model
is
normally
when
The
signal
to
the
Soft
This
control
solo,
pedal
organ,
tones
characteristic
Tube
S
circuit.
and
by
tube
cuts
reduced,
S-4
the
pedal
from
amplifier
"
and
by a
and
this
cut
shunts
S-1
When
the
C220.
«"^
off
nnuch
allowing
circuit
off
by a
keying
the
plate
tube
a
chord
smaller
of the
this
tube
pedal
When
^^^'
the
"^"^S"
more
the
condenser
is
positive
contact
of
V20,
resistor
tones
amount
human
is
normally
keying
pedal
^"^-
rapidly
essentially
voltage
connects
the
pedal
where
equally.
it
across
in
order
ear.
cut
off
wire
is
grounded
is
released,
"P^dal
*1^^
^
because
to
charge
the
applied
the
control
joins
the signal line
It
is arranged
to
the
sooner.
same
to its
grid
tube
the
combined
compensate
by
a
negative
by^pressinVa
the
tube
Fast
resistance
except
cathode
circuit
goes
through
to
reduce
to
reduce
for
is
that
to
solo,
voltage
cut
Decay"
in'Ehis
the
circuit.
the
the
organ,
the
the
frequency
the
off
aeain
swx"chTs
pedal
same
pedal
volume
volume
applied
Pedal
as the
leak
control
The
positive
bal-
and
chord
of
re-
it
path
note
of
16
Expression
Control
Unit
After
control
set of
the lever in
"soft" position
Power
Tube
two output
ume
adjustment.
Power
filters.
Most
and
10,
Generator
The
switches;
the pedal
and
amplifier
This
removing
shown in
(as
can be
this
position.
Figure
and
figure
the
by
passing
unit, a
movable
Output
V27
tubes.
Supply
The
power
of
11.
Assembly
generator
the
frequency
chassis
two
operated
12,
13
schematic
special
plates
'loud"
it
goes
Stage
is
a
An
supply
the
assemblies
vibrato
tubes;
is
screws
figure
(but the
showing
(pages
diagram
through a
variable air
coupled
position
through a
common-cathode
adjustable
stage
the
circuit
amplification,
of
condenser with
the
to
plate
knee-operated
signal
tone
-compensated
-innpedance
feed-back
is
conventional
DESCRIPTION OF COMPONENTS
comprising
contains
oscillator
dividers;
and
pivoted
(see
10)
53-55-57)
the
solo
oscillator,
and
vibrato
the expression
portions
between
figure
expose the
to
of the
the
can
it
9)
components
expression control
the outside of the chassis,
is a view
reference symbols.
the
two
expression
V20
of
goes directly
attenuating
phase
condenser
in
design,
the
instrument
frequency
switch
control
power
keyboard
be
unfastened
will not work) with
of
the inside, with all
tube; the
unit;
supply.
chassis
inside the
identifies all
signal
sets of fixed
reaches
network.
inverter,
C237
serves
using
are
visible
dividers
six
all
the
blocks
that
so
chassis.
the
expression
plates
control
V27,
to
which
as a
and
lever.
while
drives
factory
a
With
in
the
vof-
resistance-capacity
in
figures
and
tuning
chord
oscillators;
control
(figure
it
will
swing
The
the
generator in
external
components,
components
9,
tubes
By
9).
down
instrument
identified
the
Organ Oscillator
This
tifies
If it is
venient to
enough
Keyboard
This
them;
chassis
the
external
place
to reach
Chassis
unit
the
keyboard,
necessary
includes
Keyboard
The
keyboard
sealed
board
against
and
the
dust.
chord
Assennbly
contains
components
to work
it
on a
chair
to this
position.
the
chord
itself
Figure
switch.
circuits of
and figure
on the
directly behind the
two
keyboard chassis
switch,
includes
17 shows the
control
37 molded plastic
the
inside
16 "organ"
16 shows
this
of
oscillators.
the
inside.
chassis,
it
instrument.
blocks
assennbly, tuner assembly, and
locations
17
and the units
keys
of
and
busbar
Figure
will be
The
cables are
a
contact
shifters
15
iden-
found
con-
mounted
generator.
mechanism
for
the key-
long
on
SCREWS
TOP COVER
HOLD
GENERATOR
ASSEMBLY
BRACKETS
HOLD
GENERATOR
I
ORGAN
OSCILLATOR
ASSEMBLY
FIGURE
-
9
BACK VIEW
18
»
SOLO
MAIN
TUNING
CONDENSER
CONTROL
(COVER
ASSEMBLY
removed)
TUNER
ASSEMBLY
GENERATOR
POSITION
IN
HORIZONTAL
FIGURE
10-
GENERATOR
TUNER
,
ASSEMBLY,
AND
CONTROL
ASSEMBLY
EXPOSED
FIGURE
-
II
KEYBOARD,
CHORD
CHORD
SWITCH,
19
SWITCH
AND
BALANCERS
EXPOSED
i
!'
ill
^
f
-I
U
—
qcq:
t/)
t-
20A
Loading...