Heath Heathkit W4-AM Assembling And Using page 7

Components
with wire
pigtail
leads can be conveniently sorted
by inserting one
of the ieads into
the
corrugated edge
of
the shipping carton
flap.
It
may
be
helpful to
mark
the
value
of the
com-
ponent on
the flap
so
the
part
may
be readily located
when
needed.
If
some
shortage
is
found
in
checking
the parts,
please
notify us
promptly and
return
the
inspec-
tion slip
with
your
letter to us.
Hardware
items are counted by weight.
An
occasional shortage
occurs and
if
this is
true
in
your
kit,
please obtain the
missing
parts
locally
if
at all
possible.
Resistors and
controls generally have a
tolerance rating
of
±20% unless otherwise
stated
in
the
parts
list.
Therefore, a 100 Kfl resistor
may
test
anywhere from
80
KH
to
120
Kfl
and
still
be
acceptable.
Tolerances on
electrolytic condensers
may
be even wider and
commonly
run
from
±100%
to
-50%.
The
parts furnished with your
Heathkit
have been
specified
so as
to
meet
the
performance
specifications given.
In
order
to e^qjedite
delivery
to you,
we
are occasionally forced
to
make
minor
substitutions of
parts.
Such
substitutions
are very
carefully
checked before they are
approved and
the parts sup-
plied will
work
satisfactorily
in
your
kit.
For
example,
if
your
kit is
short a 15
K(2
resistor
and an
18 K£J resistor
is
furnished which
is
not
in
the parts
list,
you
will
understand
that
such
a
substitution
has been made.
This
fact
is
mentioned here
only
to
prevent any confusion
in
check-
ing the contents
of
your
kit.
CAUTION:
We
strongly urge
that
you
follow the
wiring
and
parts
layout
shown
in this
manual.
The
position
of
leads
and
parts
is
quite critical
in
the
instrument and changes
may
seriously
affect the
characteristics
of the circuit.
We
do
not
represent
that the circuit
or layout
of
the
instrument cannot be improved; however
the
methods shown
in this
manual
are the result of
many
experimental models and
unless
the
constructor has access
to
full
laboratory
facilities,
we
rec-
ommend
that they
be followed very
closely.
Actual construction
of the amplifier consists
of
three phases, each
of
which
is
covered by
a single
drawing
containing
all pertinent
information
necessary
for
completion:
Phase
I -
Assembly
of
parts
to
chassis.
Phase
n
-
Preliminary
wiring.
Phase
HI
-
Final wiring.
These
three
drawings appear on
the
following
pages
of the
manual.
They
'are
also
reproduced
in
much
larger
form
as fold-in inserts included with
this
manual.
The
large
drawings
should be
mounted on
the
wall above your
work
space where
they
may
be referred
to readily.
Notice
that
each phase
consists
of
a
sequence
of
operations,
which are
contained
in
numbered
boxes surrounding
the
drawing.
When
a note
is
referred
to,
the note will
be found near
the
oper-
ation
box where
it
is first
applicable.
At
the
end
of
each
operation, a
small space
is
provided
(
).
Use
this to
check
off
each
operation as
it
is
completed. Then,
if
your work
is
interrupted
possibility
of
skipping
an
operation
is
minimized.
Start
Phase
I
with operation
1,
in the
upper
left
hand corner
of the
drawing. Follow
the
steps
in
numerical
sequence.
Page
5