HELPFUL
KIT
BUILDING
INFORMATION
Before
attempting
actual kit
construction
read the construction
manual
through
thoroughly
to familiarize
yourself with the
general
procedure.
Note the
relative location
or
pictorials
and
pictorial inserts
m
respect
to-
the
progress
of the
assembly procedure
outlined.
This
information
is
offered primarily for the
convenience
of novice
kit
builders
and
will be of
definite
assistance
to those lacking thorough
knowledge
of
good
construction
practices* Even the advanced dec-
troriics
enthusiast
may
benefit
by a
br
ief
review
of
this material
before
proceeding
with
kit construction.
In the majority of cases*
failure
to
observe
basic
instruction
fundamentals
is
responsible
for
inability to
obtain
desired
level
of
performance.
RECOMMENDED TOOLS
The
successful
construction
of IJeathkits does not
require
the use of
specialized
equipment and
only
basic
tools
are
required. A good quality
electric
soldering
iron
is
essential. The preferred size would
be
a 100
watt iron
with
a small tip. The use of long nose
pliers
and diagonal or
side
cutting
pliers is recommended.
A small screw driver
will prove
adequate
and
several
additional assorted screw
drivers
will
be helpful.
Be sure to
obtain a good supply of
rosin
core
type radio
solder.
Never
use
separate
fluxes,
paste or
acid
solder in electronic
work.
ASSEMBLY
In
the
actual mechanical
assembly
of components
to the chassis and
panel*
it is important that the
procedure shown in the
manual
be care-
fully
followed.
Make
sure
that tube sockets
are
properly mounted in
respect
to keyway or pin
numbering
location. The same
applies to
transformer
mountings so
that the correct
transformer
color coded
wires
will
be
available
at the
proper chassis
opening.
Make it a
standard
practice
to use lock washers
under
all
6-32
and
8-32
nuts.
The only exception being in
the
use o£
solder
lugs—
the
necessary
locking
feature
is
already incorporated in
the
design of the
solder
lugs.
A control lock washer should
always
be used
between
the
control
and the chassis to
prevent
undesirable
rotation
in
the panel
To
improve
instrument appearance and to
prevent
possible
panel
marring
use a control flat
nickel
washer
under each
control
nut.
When
installing
binding posts that require the use
of
fiber
insulating
washers*
it is good practice to
slip the
shoulder
washer over the
binding
post
mounting
stud
before
installing the mounting
stud
in the
panel
hole
provided. Next, install a flat fiber
washer
and a
solder
lug
under
the
mounting
nut.
Be
sure
that the shoulder w
T
asher
is properly
centered in
the
panel
to prevent possible
shorting of
the
binding
post.
WIRING
When
following wiring
procedure
make the leads as short and direct
as possible.
In filament
wiring requiring the use of a twisted
pair
of
wires allow
sufficient slack in the
wiring that will
permit
the
twisted
pair
to
be pushed
against the
chassis as closely as possible thereby
affording
relative
isolation from adjacent parts and wiring.
When
removing
insulation
from
the end
of
hookup
w
T
ire>
it is seldom
necessary to expose
more
than a quarter inch of the wire. Excessive
insulation
removal
may cause a short
circuit
condition
in
respect
to
nearby
wiring or
terminals.
In
some
instances* transformer leads of
solid
copper
will have
a brown baked enamel coating. After the
trans-
former leads
have
been trimmed to a
suitable
length,
it is
necessary to
scrape
the enamel
coating
in
order to expose the bright copper wire
before
making
a
terminal
or soldered connection
,
In
mounting
parts such as
resistors or
condensers, trim off all excess
lead
lengths so that
the
parts may he installed in a
direct
point-to-
point
manner.
When necessary use
spaghetti
or
insulated sleeving over
exposed
wires that might
short
hi nearby wiring.
It is urgently
recommended
that the
wiring
dress
and parts layout
as
shown
in
the construction
manual
be faithfully followed. In
every
instance, the desirability
of
this arrangement was
carefully
determined
through the
construction
of a series of
laboratory
models.
SOLDERING
Much of the
performance
of the kit
instrument*
particularly in
respect
to accuracy
and stability,
depends
upon the degree
of
workmanship
used
in making soldered
connections.
Proper
soldered
connectious
are
not
at all
difficult
to make but it
would
be advisable to observe
a few
precautions.
First of
alt before
a connection
is to be
soldered, the
connection itself
should
be clean
and
mechanically
strong. Do
not
depend on
solder
alone to
hold
a connection
together.
The
tin
of the
soldering
iron
should
be
bright* clean
and
free
of excess
solder.
Use
enough heat to
thoroughly flow
the
solder smoothly into
the joint.
Avoid
excessive
use of
solder
and do not
allow
a
11 ux Hooding condition
to
occur
which
could conceivably
cause a leakage
path
between
adjacent
terminals on
switch
assemblies
and
tube
sockets. This is
particularly
important
in
instruments
such as the
YTYM,
oscillo-
scope and
generator kits. Excessive
heat will
also
burn
or damage the
insulating
material used
in the
manufacture
of switch
assemblies.
Be
sure to use
only
good quality
rosin
core radio type
solder.
Antenna
^
General
v
-AAAr
Neon
Bulb
^
—
—
Receptacle
/j~jj
two-conductor
Loop
“
“VyV
Illuminating
/TT|\
Lamp
\JJ/
Battery
j
j
Ground
L
Resistor Variable
—
—
Switch
Single pole
C)^0
Single throw
Fui
*
cf\P
Inductor
^-0
General
Of
Potentiometer
Switch
double
pole
O
single
throw
0
TJ
Pieic electric
i UF i
Crystal
1
|J
1
Air
core
\
Transformer
X)
General
i
Thermistor
| j | j
Switch
Q^O 0
Triple
polo
OPO
0
Double
throw
Q u O
1 000
—
Adjustable
_4]
Powdered
Iron jXk
Care
J .
\f
—
r
Jock
two conductor
^
Y
Switch
4
^q
Multi point or
0 0
Rotary
q,Q
1,000,080=1
^
Magnetic Core
—A
Variable
Coupling
^^
3
*
Jack
Q
y
1
three conductor
Q
^
1
Speaker
—If
OHM
“
Iran Core
^4
Transformer
0<
Wires
.
4-
-L-
4-
connected
• w
T
y
Rectifier
—
Microfarad
“
^
j™
Capacitor
j
/
General 1 r
—
"
Wires L ,
Crossing but
_/T\
_ .
1
not connected
'
Microphone
^
]
Capacitor
.
,
Electrolytic
-
—
I
f
—
”
A.
Ammeter
-J
Y
V.
Voltmeter
V J
G. Galvanometer
MA.
Milliammeter
uA.
Microammeter,
etc.
Typical hi be symbol
__L
Plate
reen
Binding
post
G d
J
[ j
K
Terminal strip
|q
(j
q
q|
Capacitor
.
Variable
—
-L£—
cathode
filament
Wiring
between
X
-4-
4-
4
like
letters is
—
^
X
Y X V X
understood
—
^
Y
Courtesy of 1, R. E.
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