Step-By-Step Assembly Instructions - Heathkit W-5M Assembling And Using

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
KO
resistor
may
test
anywhere from
80
K£2 to
120
KO
and
still
be
acceptable.
Tolerances on
electrolytic
condensers
may
be even wider and
commonly
run
from
+100%
tb
-50%.
The
parts furnished with your Heathkit have been specified so as
to
meet
the
performance
specifications given.
In
order
to
expedite 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
supplied will
work
satisfactorily in
your
kit.
For example,
if
your
kit is
short a
15Kfi resistor
and an
18 Kfi resistor
is
furnished
which
is
not
on
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.
STEP-BY-STEP
ASSEMBLY INSTRUCTIONS
In
assembling
the
kit,
use lockwashers under
all nuts,
unless otherwise
specified.
Tube
sockets
are
mounted
inside the
chassis except
for
miniature 9-pin shielded sockets,
which are
mounted
on
top.
The
insulated
filter
condenser mounting wafers are
mounted on
top
of
the
chassis.
Other
details of
construction are included
where
pertinent
in
the instructions.
"
(
)
Place
the
chassis with
the
open
side
up
in
front of
you on your workbench.
Be
sure
that
the
apron
with
the
holes
in
it
is
nearest
you.
See Figure
8
on Page
13.
'1'*
)
Mount
a 9-pin miniature tube socket
at
location
VI, using 3-48 hardware with lockwashers.
Use
the
chart on
Page
32 to identify
hardware
sizes
if
necessary.
The body
of the
socket
should be
outside the chassis, with the lugs extending
up through
the
socket hole.
Orient
the
socket so
the
blank space
is
positioned as
shown
in
Figure
8.
)
In
the
same
fashion,
mount 9-pin miniature socket
at
V2.
NOTE:
In
the following steps,
do
NOT
use
the
6-32 x 1/2" screws
until
called for.
Install
an
octal
socket
at
V3, using 6-32
hardware.
Be
sure
that
a 1-lug
terminal
strip
is
mounted
on one
screw
as
shown
in
Figure
8.
Position the
keyway
of this
socket
to
the
left
as shown.
( )
Similarly, install
octal
socket
V4 and terminal
strip F,
with
keyway
oriented in the
same
position.
)
Mount
octal
socket V5.
Note that the
keyway
for
this
socket
is to
the right.
No
terminal
strips
are used on
this
socket.
( )
Outside
the
chassis, install
insulated
condenser mounting wafer
at G,
using 6-32 hardware.
Be sure
that the
wafer
is
mounted outside the chassis.
)
In
the
same
manner, mount
a
second
insulated
condenser mounting wafer
at
location H.
This
wafer also
mounts
outside the
chassis.
%«-
)
Insert a
3/8" rubber
grommet
in
the
chassis hole
at
R.
f
)
Insert a
3/8" rubber
grommet
in
the front
apron
of
the
chassis
at
FF.
( )
Insert
3/4" rubber
grommets
at
locations S
and
T.
( )
Mount
a
2-lug
terminal
strip
A
and three dual-lug
terminal
strip B,
using
the hole
to
the
left
of
socket VI.
Use
6-32 hardware.
( )
Mount
three dual-lug
terminal
strip
C,
between sockets
VI and V2, using
6-32 hardware.
( )
Mount
4-lug terminal
strip
X
directly
below terminal
strip C.
Use 6-32 hardware.
Page
12