Heathkit AA 100 Assembly Manual

Page 2

Assembly

and
. TABLE OF CONTENTS
Operation
ecfiicafios..i................. 2
of the SP "
HEATHKIT CHCUI Description.
ConstructionNotes................ 11

STEREO PartsList.,.................... 12
AM PLIFI ER Proper Soldering Techniques. ........ 15

MODEL AA-1OO Chassis Wiring And Soldering. . . ... . . . 15
Circuit Board Wiring And Soldering. . . . . l7
Step-By-Step Procedure. . . . . . . . . . . i . 18
Step-By-Step Assembly. . . . . . . . ...... 19
chassisWiring....l.........i.... 23
Installation of Input Level Controls. ..... 32
Initial Hum Balance Adjustment, _ . . , . . 38
Installation ..... 38
Operation...................... 41
lnCaseofDifflcultyH,.,...,..,,.. 43
Service Information ............. 44
Service. ................ 44
Replacements. . ........... . 46
Shipping Instrucuons. . ........ 46
Bibliography ................. 47
Warranty.. .. ............... . 47
HEATH COMPANY. Schematic ............... . .. 47*
BENTON HARBOR» ' *Fold-out from Page.

MICHIGAN

All prlces 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

5 6 E's/WW 7" obligation to inco crate new features in instruments pre-
EDAVSTROM, INCORPORATED viously 501d. 1'):

toryriam I no
H... Cnmnafly 5/19/61

Page 37

Page 38

I a
I DAVSYROM
I d

INITIAL HUM BALANCE ADJUSTMENT

( ) Set all controls as follows:

MODE SELECTOR switch - STEREONORM.

SOURCE SELECTOR switch - STEREO
NORM. PHONO

BALANCE control - l2 o'clock position

SEPARATION control - maximum counter-

clockwise (at normal)

VOLUME control - minimum counterclock-

wise

LEFT CHANNEL TONE 12 o'clOCk

RIGHT CHANNEL TONE (flat) Wmm

( ) Under the chassis, set all nine INPUT
LEVEL controls andthe two ,INPUT LEVELS
IO POWER AMPS controls to their maxi-
mum clockwise positions.

( ) Before making any input connections, turn
POWER switch 0N and wait approndmntely
one minute for the tubes to warm up. Now
advance the VOLUME control until chum
is heard In both speakers. Carefully adjust
the RIGHT CHAN HUM BALANCE control
until the hum level is minimum, as heard
from the RIGHT speaker. Now adjust the
LEFT CHAN HUM BALANCE control for
minimum hum, as heard from the LEFT
speaker. As the hum is progressively re-
duced by the HUM BALANCE controls, it
will probably be necessary to turn up the
VOLUME control in order to better detect
the condition of minimum hum, which is
quite critical. The HUM BALANCE controls
should be readjusted later, after the input
sources have been connected to the AAAOO.
The minimum hum will also be much lower
when the inputs are connected.

INSTALLATION

The Model AA-loo is primarily intended to set
in an "open" location, such as a table top or
shelf. Its decorative cabinet shell was designed
for this type 0! installation. The unit may be
panel mounted, if desired, by removing the feet
and the cabinet shelL When mounted inthis my,
the cutout is completely covered by the front
panel, resulting in a neat installation. Vertical
mounting (panel horizontal) is not recommended.

VENTILATION is important for long component
life in any piece of electronic equipment, due to
the unavoidable generation of heat within the
equipment. In the Model AA-loo, ventilation is
obtained by the open back and the slots in the
cabinet shell and bottom cover. When operated
on a shell, the back at the cabinet should be at
least an inch from the well; also, aclearance at
at least 2" above the top ofthe cabinet should be
provided. if these precautions are followed, ade-
quate air circulation will be promoted and the
unit will run relatively cool.

Adequate ventilation will ordinarily be no prob-
lem if the unit is installed in an open-back cab-
inet, provided there is a small amount of clear-
ance above the unit for hot air to escape.

IMPORTANT: BECAUSE OF THE EXTREME
SENSITIVITY AND HIGH POWER OUTPUT OF
THE AA-IOO, IT IS IMPERATIVE THAT THE
FOLLOWING PRECAUTION BE OBSERVED:

NEVER UNDER ANY CECUMSTANCES CON-
NECT OR DISCONNECT ANY INPUTS WHILE
POWER IS ON, WITHOUT FIRSTTURNINGTHE
VOLUME CONTROL FULLY COUNTERC LOC K-
WISE. FAILURE TO OBSERVE THIS PRECAU.
TION MAY DAMAGE THE SPEAKERS GROUT-
PUT TRANSFORMERS, NECESSITATING
COSTLY REPAIR OR REPLACEMENT.

W

Most signal sources terminate in a standard
RETMA phone plug which {its the input sockets
of your AA-loo. Eight plugs or this type, along
with a length of shielded cable, are furnished
1ch the purpose of making up input cables for
connection to the AA-lOO. See Figure 25.

If you are in doubt about the correct input con-
nections {or the various types of signal sources,
the following information should prove helpful.

[smash rum
scum usv

swnn
uNwouN o

\

air Figure 25

um Loo!
" res shun.

not: SHORTING
PLUG

.i 2 It. Ifi

T
l

NOTE: The shielding of the input cable should
not touch the chassis of the AA-lOO at any point.
Grounding to the chassis at this point could
create excessive hum.