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

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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?

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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

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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

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ected

chord

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trolled

the

with

bar,

functions

by

relative

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volume

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GENERATING

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of

amplified

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of

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chord

while

of

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pedal

of

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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

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simplified

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depending

and

are

with

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speaker.

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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

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last-played

insures

of

the

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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.

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viders

notes

for

are

the

solo

that

selected

still

frequency

notes

preceding

divider

are

through

each

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while

chord,

is

G

is

played.

pedal

the

be

of

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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

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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

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below

waves

the

first

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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

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tube.

notes

note

closes

fre-

the

This

notes

to

in

lower.

notes,

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+.

to

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is

tube

sounds

potential

ancer

signals.

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the

the

sponse

Control

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^"^

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by

K.:

the

greatly

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Model

is

normally

when

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signal

to

the

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control

solo,

pedal

organ,

tones

characteristic

Tube

S

circuit.

and

by

tube

cuts

reduced,

S-4

the

pedal

from

amplifier

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and

by a

and

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When

the

C220.

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off

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allowing

circuit

off

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keying

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tube

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smaller

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tube

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more

the

condenser

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positive

contact

of

V20,

resistor

tones

amount

human

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rapidly

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voltage

connects

the

pedal

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equally.

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across

in

order

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cut

off

wire

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is

released,

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because

to

charge

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applied

the

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the signal line

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to

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sooner.

same

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grid

tube

the

combined

compensate

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negative

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the

tube

Fast

resistance

except

cathode

circuit

goes

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to

reduce

to

reduce

for

is

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the

circuit.

the

the

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the

the

frequency

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off

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swx"chTs

pedal

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volume

volume

applied

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leak

control

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positive

bal-

and

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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

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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

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a

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supply

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vibrato

tubes;

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screws

figure

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showing

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diagram

through a

variable air

coupled

position

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stage

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amplification,

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to

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signal

tone

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feed-back

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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,

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instrument

frequency

switch

control

power

keyboard

be

unfastened

will not work) with

of

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tube; the

unit;

supply.

chassis

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identifies all

signal

sets of fixed

reaches

network.

inverter,

C237

serves

using

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dividers

six

all

the

blocks

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chassis.

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plates

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to

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as a

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drives

factory

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in

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figures

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tuning

chord

oscillators;

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it

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swing

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the

generator in

external

components,

components

9,

tubes

By

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down

instrument

identified

the

Organ Oscillator

This

tifies

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venient to

enough

Keyboard

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them;

chassis

the

external

place

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Chassis

unit

the

keyboard,

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The

keyboard

sealed

board

against

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dust.

chord

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contains

components

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chair

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position.

the

chord

itself

Figure

switch.

circuits of

and figure

on the

directly behind the

two

keyboard chassis

switch,

includes

17 shows the

control

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the

inside

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this

of

oscillators.

the

inside.

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instrument.

blocks

assennbly, tuner assembly, and

locations

17

and the units

keys

of

and

busbar

Figure

will be

The

cables are

a

contact

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15

iden-

found

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mounted

generator.

mechanism

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FIGURE

10-

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14

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unit

59)

Expression

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instr\iment, and

the

pushes the

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FIGURE

switch

chord

contacts

Figure 18

details of the

includes

register

the

shows

a long channel

the

main solo

Control

-operated

expression

and

the

position.

-

17

assembly

busbars,

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the

mechanical

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the

all

control

position

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expression

power

control

UNDERSIDE

includes

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tablets

circuits,

components

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control

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19

Figure 20

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SERVICE

suggestions

later

paragraphs

OPERATIONS

deal

with general

give

specific

service

problems

suggestions

for

certain

1.

Tubes

and

As

cause

be

tested

tubes

testers,

terchanging

tube

appears

unsatisfactory

of

occasionally

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in

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pacity

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listed,

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.

cause

Refer

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condensers

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electronic

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show

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for

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all

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than

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the

resistors

resistance

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the

the

vacuum

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all

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simply testing

the

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resistors and

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can

and

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in

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booklet

shown

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replacements

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cases

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the

locally.

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on

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man

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see

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a

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simplified

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circuit

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coils are

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diagram.

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ca-

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paragraphs

under

ters are

3. Contacts

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The

similarly

to

be failing,

cedure

fixed

care

piece

to

emery

4.

for

contact

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stiff

rub

the

cloth

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all

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key

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it

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the

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knobs

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the

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tablets

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have

precious metal

failure

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procedure

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severe

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shifter

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contacts,

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The

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them

booklet.

two

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use

5.

Tuning

Individual

of

Organ

and Chord

Notes

1^

^

such

Complete

in

6.

be

is

"Owner's

the

Tuning

The

of

Chord

expected

particularly stable in regard to

instructions

Service

Individual

Organ

remain

to

Suggestions"

Solo Notes

satisfactorily

"Owner's Service Suggestions"

after long use under extremely adverse

solo notes

tuning

of tune

actually

richness

must be turned

ded. A Hammond Organ is

tively established by the frequency

other instrument as a

may

not be

is necessary,

to

make

them

exactly

absolutely

be

unsatisfactory. Remember

desirable in many cases because they

the tone. A

to

more

If it is decided that

note

than one step to bring it

pitch

for

booklet.

carefully

is

timed

in tune for a long

the nnusical

booklet does

in tune

certain

generally requires

tuning is

required,

preferred

of

standard

unless

standard pitch.

Note: While

Chord

can

If any

to

Organ

adjusted

be

solo

follow this

any single

can be

witkout

has

note

entire

tuning are

standard

to

interval

mention

not

humidity

with

each

the

that

add

in tune.

the

pitch

as a

the electric

is

it

chord

tuned

to

individually,

affecting

retuned,

be

procedure

given

under

pitch

time.

between

this type

conditions,

other.

Before

notes are

that small

a 'thorus"

retuning if the

following procedure is recommen-

standard

current supply.

known

or

in order.

to

organ

the ones

will

it

"Screwdriver

at

The

it

factory and can

the

tuning system

solo

notes,

is

and

of

timing.

possible that some

concluding

actually far enough out

differences

effect which gives

"Small Steps" knob

because

its pitch

Never use

precisely

be

of the

note

no solo

below

be

note

it.

necessary

Timing"

the

so

However,

that

in

tuning

is posi-

tuned to

re-

any

are

added

1^

(a)

Connect

horizontal

a

of

Hammond Organ

first

white

set

key.

be

turned

Leave

(b)

all

20 control

three

(c) Remove

generator

(d) Observe

of

the

loosen

bobbin

(e)Hold

down the

Hammond

nnately

Adjust

(£)

wave

pattern

the voice

coil

or vertical)

drawbar (fundamental)

If

the

organ

off.

the

Chord Organ

tablets

^Vibrato

the,

the setting of

coil

the

end

equal

the "Big

Cancels"

top cover

and

control assembly

bobbin

clannping

is even

should be within

screw, slide the

with

highest

Organ.

Adjust the

horizontal

Steps"

move

as

slowly

terminals of the

of an

to

is

in

of

oscilloscope,

the other set

of the organ

equipped

for

on

at the

in

the Chord

at least

top

at the

and then

bottom.

cover must

coil

the

key (F)

(figure

37

core,

of the

and tighten the- screw.

volume

and

vertical

and

"Small

as

Steps"

possible.

and

Organ

connect

Chord

of oscilloscope

and

with

vibrato, tremulant,

minutes

15

press

Organ,

exposing

be

7

shows

l/32"

of

coil

Chord

levels

deflections.

solo

the locations

end of

the

carefully forward

Organ

that the

so

tuning

to one

the

plates.

press

the

before starting

"Tenor",

the

solo

in their

and the

normal

the iron

highest

oscilloscope

knobs

to

set

of plates

voice

Pull

coil

out

terminals

only

corresponding

or chorus, they

tune. Press

to

"Full Tone",

tuning

positions.

of all

coils).

core.

or

backward

F

and

coils.

If

it

key of the

has approxi-

make

the

oscilloscope

(either

the

pre-

should

the

The

The

end

is not,

until the

27

Adjust

(g)

dicated

cycle

(h)

Release

Adjust

order

down

all

(i)

After

coil

by

in

two

the F

coil

downward.

one

of

the

tuning,

37,

the

oscilloscope

seconds.

keys and

in

36

key

at

higher

recheck

if

necessary,

the

same

It is

a

time,

coils.

all

to bring

pattern

hold

down

way.

important

because

notes

standing

the

Repeat

to start

the tuning

to

see that

it in

next

for all

tune

with

still

or

lower

keys (E)

other

tuning

all

with

of the lower

coils

the

naoving

keys

the

notes is

are

tuned

Hanrimond

no

more

on the

and

coils

highest

accurately.

Organ

than

two

instruments.

in

chromatic

note

and

dependent

as in-

one

progress

upon

SPECIFIC

The

Chord

J

I

I

I

|-

(

I

(figure

operation

of

cases

mentioned.

may

man

the

volt

based

6)

possible

that

Only

the

be

caused

When

a

will

circuit

meter,

on

Wave

particularly

on

the

circuit

the

patterns

Entire

7.

be

obtained,

ages

will

the

amplifier

Vibrato

8.

naay

not

Organ

shows

of

troubles,

the

the

entire

that

various

most

by

trouble

find

it

helpful

diagram

and

line

the

some

voltage

may

oscillatbrs

a

shapes

diagram

inverted.

instrument

the

be

missing.

tube (half

effect

be

working,

appears

any

possible

controls.

arranged

instrument

likely

other

has

causes

components

been

to

(figure

observe

may

of

117

be

checked

(figure

fails

rectifier

If

completely

or the

traced

6).

vary

and

to play.

voltages

of

SERVICE

complicated,

trouble

This

according

plays

of

All

if

volts.

witn

frequency

6).

tube

VZO)

missing.

vibrato

correctly

each

symptom

directly

to a

voltages

D-C

a

meter

an

It

should

K

all the

VU

may

are

or

the

The

switch

SUGGESTIONS

a

but

can

technique

to

certain

voltages

of

oscillosciope

dividers,

be

present,

phase inverter and

careful

generally

is

illustrated

their

symptoms.

with

the

are

listed, but

associated

part

of the

and

compare

are taken

different

in some

and

be

noted

that

tubes are lighted

defective. In

probably there

vibrato

tube (half

oscillator

study

be

of

isolated

It

exception

with

the

instrument,

them

with

with a

sensitivity

parts

compared

some

of

oscilloscopes

but no

this case

driver

(half

V5)

may

the

circuit

by

by

the

is

assumed

of

similar

circuits

those

following

the

diagram

observing

in

symptoms

symptoms

mentioned.

the

service

shown

ZO,000-ohms-per-

is

used.

of the

with

sound can

all DC

is

a

defect

tube V27.

of tube V2)

be

All

circuit,

patterns

will

volt-

in

defective.

the

list

all

on

are

shown

show

Radio

9.

suppressor.

should

rt

I

10.

11.

Frequency

be

added

SPECIFIC

All

solo

notes

^J^^^^^I^TlHJTSTn^rV^TJFTre

may

be

defective

Solo

and

organ

oi

v^u;

IS

probably

chords

Sustain

or

weak,

play

Cancel'

whether

oscillation.

This

resistor

if RF

fail

divisions

when

is

oscillation

SERVICE

to

pla

fail

defective.

chord

"Sustain

off;

bar

in

Check

was

not

used

occurs.

SUGGESTIONS

or

are

y

is

Model

Cancel"

weak

to

play

In

Model

pressed,

S-4,

is

R254, which acts

.

or

all

on

in early

FOR

One

of

.„lo

preamplifier

are

weak.

S

or

S-1

but

do not

solo,

or

off.

Model

SOLO

the

with

sustain

organ,

as a

radio

S

instruments,

DIVISION

solo

oscillator

tube

The

preamplifier

defective

and

chord

frequency

(half'^o'f

preamplifier

or

are

tones

tubes

weak

and

V8)

tube

when

are

(half

absent

|,^>

C

a

{

28

1

12,

^^-

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15.

16,

^^-

^^'

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contact

the

keyboard

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playing

make

One

as

directed

All

solo

of

the

Solo

cates

this

case

One

solo

tablet,

}f^l

off,

the

Solo

'^ass"

tube

V6

octave

will

on

key

plays

correctly;.

the

note

solo

timbre

notes

contacts

key

thumps

that

the

install

register

In

this

instructed

^l

bass

may

too

high

not

one

key

busbar

lowest

noisy

in

paragraph

fail

on

two

case

rectifier

does

be

at

in

play

may

shifter

In

or

contro

to

play

the

or

clicks.

solo

two

new

control

one

in

not

play

fault.

pitch.

a

solo

note

make

the

(paragraph

"

"F

solo

this

case

irregular.

l

will

not

3.

for

one

tablet

is

An

control

tubes

does

contact

paragraph

tube

(half

at

all

This

may

on

any

note

note

instead

the

solo

Adjust

turn

position

dirty.

annoying

tubes

of

the

not

play

of

the

K

3.

of

V7)

(with

also

reg

play

2).

tuning

off.

Clean

thump

V9

and

same

for

register

the

may

"Solo

make

ister

control.

irregularly

of

its

correct

contact

the

keyboard

The

tablet

of

the

"Solo

as

instructed

each

VIO

are

make.

one

position

control

"Bass"

be

tablet

defective.

Woodwinds"

the

tones

A

or

fail

pitch

i s

dirty.

busbar

has

a

dirty

Woodwinds"

in

time

a

key is

not

properly

of

the

tablet

fails

either

irregularly

a

dirty

solo

entirely.

with

(

adjacent Itpv^

This

shifter

contact.

tab

paragraph

released

matched.

"Solo

is

with

on

Woodwinds"

probably

"Solo

or

ff)

o

noisy

j

control

Adjust

may

also

(paragraph

Clean

let.

One

3.

indi-

In

dirty

Woodwinds"

Divider

or

an

j

2).

19-

^°-

^^-

^^-

^^'

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^°^°

tablet

may

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off.

also

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^osingnl.

may

also

Solo

"Bass

Wood^

Note:

nds"

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bypassed

and

vider

ful

ever

All

Solo

small

•Vib

rato

tact.

Clean

Average

on

and

off.

t/lean

as

.1°^^

The

second

make

I^ivider

make

'I

a

nd

the

and

tablet

is

the

"Tenor"

a

pedal

may

procedure

size

dividers

vibrato

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as

instructed

pitc

h

f

o

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instructed

"""^

P^^y ^^

tones

"Tenor"

tube

tones

off

.

common

by

C31.

dividers

upset

in

IS

necessary

should

or

solo

tablet

s

olo

note

means

in

paragraph

^^^

divider

irregularly

will

not

V4

or

its

irregularly

will

not

The

oscillator

bias

and

a

to

fail.

this

common

this

case

then

wide

is

pushed

in

paragraph

changes

that

the

^"^^ "Tenor"

driver

tube

noisy

play

at

all

driUr

tube

noisy

play

at

all

rectifier

resistor

fault

It

is

to

restore

work

vibrat

in

in

is

to

with

at

one

bias

shunt

o

top.

R37

possible

does

3,

when

compensating

3.

(half

or

(with

or

and

of

and

the

the

"Solo

does

not

play

of

V5)

may

an

octave

"Solo

(half

an

Woodwinds"

of

V3)

octave

"Soprano"

tube

(half

for

all

solo

these

a

bias

parts

also

make

all

resistor

to its

that

exception

not

come

The

tablet mav h:.^^ :.

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contact

on

or

on

with

be

too

high

may

be

too

high

will

of

Vi)

and

pedal

may

cause

a

fault

dividers

across

normal

of

the

when

"Solo

the

Wi

tablet

"Solo

defective.

in

tablet

W

pitch.

defective!

in

pitch.

not

play

may

dividers,

all

in

one

fail.

R37

of

value.

faulty

corres

ak^L

de"

is

is

one.

oodwinds"

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in

either

This

with

"Solo

be

defectiv

solo

di-

A

help-

what-

ponding

_

turned

dirty,

e.

29

SPECIFIC SERVICE

SUGGESTIONS

FOR

ORGAN DIVISION

24.

25.

'

f

key will not play

One

make the

may

bar

shifter

Two, three,

oscillator tube

adjacent

whole

tube fails

(paragraph

four,

notes.

note

is

Missing

F, F#,

low

B,

low

middle

middle A & A#;

middle

high F
high A

high

"Organ

26.

probably

let

One

27.

key plays

In

this case

the note

C#

&

G;

C, & C#; or low D,

F

F#;

&

C# & D;

F#;

&

A#;

&

D;

&

Strings"

or middle
or
or middle

or
or
or high D#,

or

has

organ

organ

the

noisy

or irregular.

an

organ note . A dirty organ control contact

play irregularly

2).

five, or

a double

one

If

it will

six adjacent

triode,

triode fails,

make

Notes

or

low G#,

A,

D#

G & G#; or all 4

middle

high G

B

high

"Organ

a

dirty contact.

note having

B

D# & E;

G#;

&
t C;

E^

Flutes"will not play

tuning

four,

A#;

&

E;

&:

& C; or

all 4

or

or all

& F;

or

Clean

pitch

contact

Adjust

fail

or

and

two

five,

or

or all 6

all

or

4

all

is probably

the

entirely. Adjust

will not

keys

half of

each

three

or

notes

six

or

all

6

4

4

all

5

for any key. The

instructed in paragraph

as

of next higher note

keyboard

play

each

notes

will

inoperative.

Tube

dirty.

busbar

the keyboard

plays

fail

faulty

notes.

to

may

organ

tube

which

be

V12
V13

V14

V15

V16

V17

V18

V19

or second note

This may

shifter

on one

key

bus-

Each

two or

sound, and

defective tab-

3.

also make

(paragraph

organ

three

if the

higher.

2).

Organ

28.

rato

Trouble in

and

pedal divisions,

observed in

masked

29.

30. Both

by

One

pedal

oscillators,

signal

be cleaned in
See

figure

pedals fail

nnay

be defective,

(half

make

too high in

One

31.

pedal

all

with

al signal

shifter

and

chord vibrato

cancel

tablet

has a

SPECIFIC

FOR

the

the pedals,

the

other notes.

fails

pedal

contact or

for positions of contacts.

19

of

V7 plus V24, V25, and V26). Failure

the

pedals irregularly

pitch. See

fails

chords,

contact in the

(paragraph

CHORD

chord section

is

likely

however,

play

to

control

control

same manner

the

play with

to

or the

play

to

all

the oscillators must

2).

effect will

dirty

to

with any

tube,

contact in

trouble

after

note

with

chord

not

contact.

SERVICE

BUTTON

of

affect

because

any

noisy or

certain

switch

AND

the instrument,

both

chords.

frequency dividers

and

the pedal*^

as

the control

chords. The pedal

may

lie

may

paragraph

chords.

is

turn off. The

"Organ

and

Chords" vib-

Clean as instructed in paragraph

SUGGESTIONS

PEDAL DIVISIONS

which includes the

these divisions. It is

of

any single note

If

the other

switch

tablet

in the

be

failing.

pedal

of the

make

them

21.

If the other

working.

Adjust

in

pedal plays

is probably

contacts

control

frequency

divider

an

This

a

chord tends

must be working.

tube (half

systenn may also

octave

pedal plays

means

the chord switch

chord button

most likely

correctly,

dirty

(paragraph

divider

two

or

that

3.

to be

to be

The

can

and

3).

V8)

of

system

octaves

correctly

one

ped-

busbar

the

30

1

Faulty

ELECTRICAL

PARTS

LIST

This

replacements

can

generally

listed

matic

model

list

here,

wiring

and

serial

REFERENCE

SYMBOL

C31

C67

C68

C69

C65

C66

includes

must

be

secured

they

may

diagram.

number

only

the

be

ordered

locally.

be

identified

To

be

of

the

CAPACITY

MFD.

4

30

20

20

30

30

parts

from

sure

which

the

If

it

by

their

of

getting

instrument.

VOLTAGE

have

factory.

is

fo\ind

reference

100

400

400

400

450

450

special

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necessary

the

correct

or

unusual

other

symbols

electrical

to

order

parts

TYPE

Electrolytic

Electrolytic

values

components

any

parts

shown

always

on

the

mention

REPLACEMENT

PART

AO-26386-0

AO-26385-0

NUMBER

so

not

sche-

that

the

C87,C89,C90,C93

C95,C96,C177,C179

C181,C183,C185,C187

C99,C101,C102,C105

C107,C108,C189,C191

C193,C195.C197,C199

C111,C112,C116

C117,C121,C122

C126,C127,C131

C132,C136.C137

C141,C142,C146

C147,C151,C152
C156,C157.C161

C162,C166,C168,C169

C237

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and

AO-500-32

AO-500-35

AO-500-43

AO-500-51

AO-500-59

AO-21468-0

exact

values

are

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REFERENCE

SYMBOL

RESISTORS

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PROCEDURE

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(a)

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white

FOR

dome

REMOVING

REPLACEMENT

cover

and

PARTS IN NEED

replace

bulb with

OF

a

#44

REPAIR

(bayonet

OR

base).

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(a) If

(b)

(c) Remove

(d) Loosen

(e)

(f)

(g)

a

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console has

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and

outermost

swing

console

end of

console.

four

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bly

cover

of

cardboard

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that

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out

rod

replace

it with

rod

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six

two

ends

tablets

which

faulty

pliers,

a

(figure

of tablet

small

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a

back panel,

generator

top by taking

screws

lift

off

screws

10)

in

at

each

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assemblies

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tablet.

tap

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amount.

remove

screw

at

and

in

and lift

tablet

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from

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of

carefully

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end in

on

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