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GENERAL
INSTRUCTIONS
Core
token
tn
the construction of
this
Instrument will
reword
the constructor
wlthmony
years
of
satisfactory
service
and
greater
confidence
In his
Instrument,
Weurge
you
to
not
rush
the construction, but
to
takeal) the time necessary
for
proper,
assembly
and
wiring.
Furthermore,
we
urge
strongly that
you
follow the
wire
and
parts
layout
shown
in
the
pictorial
diagrams
as
closely
as possible. This
Is
essential,
because
the
position
of wires
and
parts
is
quite
critical in this
instrument;
changes
may
seriously affect the characteristics
of the
circuit.
UNPACKING
THE
KIT:
Unpack
the kttcarefullyand
check each
part against
the
parts
list
Including those
parts
that
are
mounted
to
the
chassis.
If
you have
trouble identifying
any
parts, refer to
the
pictorial
diagrams
or the color
code
chart.
You may
find that
the
value of a
component
will
vary within
the
allowable
circuit
tolerance.
As
an ©Sample, a
470K ohm
resistor
may
have
substituted
for
it
a
510K ohm
resistor
if
the
circuit
is
such
as to
allow
this
substitution.
In
general,
resistors
and
controls
have a
tolerance of
±20%
unless
otherwise
specified. Therefore
a
100K
resistor
may
measure
anywhere between
80K
and
120K
ohms.
Tolerances
on
capacitors are
even
greater, unless specified.
Limits
of
+100%
and
"50%
are
usual
for
electrolytic capacitors.
CONSTRUCTION
HINTS:
USE THE
BEST
GRADE
OF
ROSIN
CORE
SOLDER
ONLY,
preferably
one
containing the
new
activated
flexes
such
as
Kester
"Resin-Five",
Ersin
"Multicore" or
similar types.
UNDER
NO
CIRCUMSTAN-
CES USE ACID
CORE
SOLDER
OR
ACID FLUX
since
acid
flux
can cause
se—
rious
corrosion. Before soldering
make
certain of
a good mechanical connec-
tion.
Use a
clean,
freshly
tinned soldering
iron,
no
smaller than
100
watts,
and
place
the solder
on
the
joint
(not
on
the
iron)
so that
the
solder
is
melted
by
the
heat from
the
joint
itself.
Do
not
remove
the soldering
Iron
until
the
solder flows
and check
to
see
that the resulting
joint
is
smooth and
shiny
when
the solder has cooled.
There
are
two
extremes
to
be
avoided; too
little
heat
and
too
much
heat.
If
too
little
heat
is
applied, the
joint will
appear
pitted
and
grey. Indicating
a
rosin joint
which
is
unsatisfactory.
On
the other
hand,
if
too
much
heat
is
applied
to
a
joint,
the
parts
connected
to
it
may
either
change
value,
lose their
protective coating, or
break
down.
If
you are
soldering close
to
a
part,
hold the lead
between
the pprt
and
the
joint
being
soldered with the
tip
of
a
pair
of longnose
pliers.
The
pliers will
conduct
the
heat
away
and
prevent the
component
from being
unduly overheated.
If
for
any
reason
it
is
necessary
to resolder
a
joint,
be
sure to
use
new
solder.
It
should
also
be
noted
that the leads
on
transformers, capacitors,
and
resistors
are
very
often longer than necessary.
These
leads
should
be
trimmed
to
the
proper length
when
wiring.
CONSTRUCTION
PROCEDURE
:
The complete
step-by-step
mounting and
wiring
procedure
follows.
To keep
the
drawings uncrowded, unnecessary rep-
etition
of
mounting
or wiring
details
may
be
omitted.
Note: The
abbreviation
(C)
means connect
but
do
not
solder
(until
other
leads
have been
connected).
The
abbreviation
(S)
means
connect
and
solder.
The
drawings
below show
the
method
of
mounting
certain specific
components
properly.
Solder
lugs
are
shown
In
the socket
mounting drawings simply
to
Indicate the correct position of
such
a
lug
when
it
Is
specified
for
a
particular
socket.
The mounting drawing
for
the
hum-balancing
pot R33,
which
must
be
Insulated
from the
chassis,
shows the proper
position
of the
Insulating
shoulder
washer.
Refer
to
the relevant
drawing
as required
during the
mounting
pro-
cedure.
INSERT
DRAWINGS
-
FOR
FIG.
1
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