Heathkit AA 100 Schematic

Page 1

fl

PRICE $2.00.

H E AT H K I T®
ASSEMBLY MANUAL

HEATHKIT .u HDAYSTROM
I.

STEREO AMPLIFIER

MODEL AA-IOO

Page 2

RESISTOR AND CAPACITOR COLOR CODES

RESISTORS

The colored bands around the bodyofacolor coded resistor rep-
resent its value in ohms. These colored bands are grouped
toward one end of the resistor body, Starting withthis end
of the resistor, the first band represents the first digitof
the resistance value; the second band represents the second
digit; the third hand represents the number by which the first
two digits are multiplied. A fourth band of gold or silver rep-
resents a tolerance of *5% or 110% respectively. The absence
of a fourth band indicates a tolerance Of 120%.

CODE

COLOR lsT DIGIT 2ND DIGIT MULTIPLIER
BLACK 0 O I
BROWN I I Io
RED 2 2 I00
ORANGE 3 3 I.Ooo
YELLOW 4 4 Iqooo
GREEN 5 5 women
BLUE 6 a romance
VIOLET 7 1 Io.ooo.ooo
any a s Ioo.ooo.ooo
WHITE 9 s - Looo.ooo.ooo
coLo - - .I
SILVER ~ - .oI
TOLERANCE
GOLD 157.

SILVER 1 IO 7.
NO BAND iZO Z-

The physical size of a composition resistor is related to its
wattage rating. Size increases progressively as the wattage
rating is increased. The diameters of 1/2 watt, 1 watt and
2 watt resistors are approximately 1/8", 1/4" and 5/16,
respectively.

The color code chart and examples which follow provide the
information required to identify color coded resistors.

EXAMPLES
-YELL.OW~4-
47 :1 L000
VIOLET~7-} (on 47nd)

l--ORANGE-I,OOO-
WV; SILVER = TOLERANCE

i I070
-RED-2

_._RED_2___ 22 x Ioo.ooo
r-GREEN-Ioomoo (on 2.2 MEG.)

I-\NO BAND -TOLERANCE
=tIIE3= tam

CAPACITORS

Generally, only mica and tubular ceramic capacitors, used
in modern equipment, are color coded. The color codes differ
somewhat among capacitor manufacturers, however the codes

MICA
CODE EXAMPLE
COLOR IerIGn' ZunDIGIT MULTIPLIE TOLER'I 2 ., x no
\ I l
4V 0 ' 32° nee VIOL RED
.4 I _ Io - ,
L 2 _ mo 9. z '
7 3 - Loco a 3
4 7 _
s - s s
_
-, _
. _
. _
- i Io
chucruuerc

osssnvs
DIIECYION of
"(Row

270mm :5 9.
on .0027 um

R1231 CHARACTEIISTIC-
mounts SE! NO": I Luv:
MICA

(VALUE IN nut-ea: NOTE 3 Hum)

shown below apply to practically all of the mica and tubular
ceramic capacitors that are in common use. These codes com-
ply with EIA (Electronics Industries Association) Standards.

TUBULAR CERAMIC
Place the group of rings or dots to the left and read from left
to right.

COD EXAMPLE

COLOR g DIGIT a... DIGIT MULTIFLIER TOLER. 6;.
7 B if 0 , :20 :20
- I fl? l toJ 3|
- Z 2 - :2
r 3 3 -- $2.5
7 . . _ _
7 5 5 :01: 15
L . . _ _
7 7 -, _ _
A a a 10.25 -
t- 5 9 :|,0

tlo
ORG out: ILK am
I I I I

Twrununs s a x I 25:
COEFFICIEN;-~

N
gimme": aauuf 25').

TEMPERATURE
COEFFICIENT-

(VALUE IN nut-5:: NOTE 3 BELow)

NOTES:

1. The characteristic of a mica capacitor is the temper-
ature coefficient, drift capacitance and insulation resistance.
This information is not usually needed to identify a capacitor
but, if desired, it can be obtained by referring to EIA Stand-
ard, Its-153 (a Standard of Electronic industries Association.)

2. The temperature coefficient of a capacitor is the predict-
able change in capacitance with temperature change and is

expressed in parts per million per degree centigrade. Refer
to EIA Standard, R3498 (a Standard of Electronic Industries
Association.)

3. The iarad is the basic unit of capacitance, however cap-
acitor values are generally expressed in terms of Iifd (micro-
iarad, .000001 farad) and out (micro-micro-farad, .000001
hid); therefore, 1,000 uuf = .001 Md, 1,000,000 upf: 101d.

LISING A PLASTIC NUT STARTER

A plastic nut starter offers a convenient method
of starting the most used sizes: 3/16" and 1/4"

down over a nut, the pliable tool conforms to the
shape of the nut and the nut is gently held while it
is being picked up and started on the screw. The
tool should only be used to start the nut.

6-32
(3-48 and 6-32). When the correct end is pushed @

Assembly

and

Operation
of the

._

STEREO
AMPLIFIER

MODEL AA-1OO

HEATH COMPANY,

BENTON HARBOR,
MICHIGAN

a subsidiary of

[2
DAYSTROM' INCORPORATED
fl

TABLE OF CONTENTS

Specifications.................... 2
Circuit Description, . . . . .. . . . . . . . . . 7
Construction Notes. . . . . . .. . . . . . . . . 11
PartsList...................... 12
Proper Soldering Techniques. . . . . . . . . 15
Chassis Wiring And Soldering. . . .. . . . . 15
Circuit Board Wiring And Soldering. . . . . 17
Step-By-Step Procedure. . . . . . .. . . . . . 18
Step-By-Step Assembly. . .. . .. . . . . . . . 19
ChassisWiring................... 23
Installation of Input Level Controls. . . . . . 32
Initial Hum Balance Adjustment. . . . . . . 38

Installation..................... 38

Operation................'...... 41

lnCaseofDifficulty............... 43

Service Information ........ . . . .. 44
Service. ....... . . . . . . . .. 44
Replacements.. . . . . ., ..... .. 46

Shipping Instructions. . . . . . . . .. 46

Bibliography................. 47
Warranty................... 47
Schematic.................. 47*

*Fold-out from Page.

All prices are subject to change Without notice. The Heath
Company reserves the right to discontinue instruments and
to change specifications at any time without incurring any
obligation to incorporate new features in instruments pre-
viously sold.

Copyright 1960

Heath Company 12/7/62