Specifications
The
only
procedure involved
in
building a
Dynakit
which requires a
bit
of technique is soldering,
and
this is
quite
easy
to
master.
There
are
four steps to making a good
solder connection:
1.
Make
a good mechanical connection.
2.
Heat
both
parts
of the connection with
the
iron.
3. Apply solder to
the
connection
until
it
melts
and
runs.
4.
Allow
the
connection to cool undisturbed.
WRONG
ALL
SOLDERING
MUST
BE
DONE
WITH
ROSIN
CORE
SOLDER.
nection
almost
immediately.
Solder
should
then
be
applied
directly to
the
parts
to be soldered,
as
shown
in
the
middle
illustration
above,
and
both
iron
and
solder removed
as
soon
as
the
solder flows freely.
To
transfer
heat
from the iron to the wire
and
terminal,
the
tip
of
the
iron should be
kept
brightly
tinned
with
solder.
If
this is properly done
the
first time
the
iron
is
used,
the
tinning
may
be
maintained
by
wiping
the
tip with
a cloth
or
sponge every few
minutes
while soldering.
When
correctly tinned,
the
tip
will
heat
both
parts
of
the
con-
The
circuit
boards of
the
SCA-35
are
supplied with all
components (resistors
and
cap;:lcitors)
already
mounted
and
soldered in place.
The
circuit boards
are
connected
to
the
other
sections of
the
amplifier channels
by
soldering
wires to eyelets on
the
boards.
These
eyelets, which
are
numbered for identification,
are
filled with solder already.
To
solder a wire to them, first
"tin"
the
bared wire
by
heat-
ing
it
with
the
iron
and
flowing
solder
over it.
The
eyelet
is
then
heated
with
the
tip of
the
iron,
and
the
end
of
the
wire
inserted
as
soon
as
the
solder
in
the
eyelet
flows. A
correctly
made
connection looks like the illustration
at
th
right, above, which shows a smooth
transition
from
eyelet
to wire.
There
is
no
warranty
on
any
equipment
in
which acid
core solder
has
been used.
Make
sure
that
the
solder
you
use is
plainly
marked
"ROSIN
CORE."
Do
not
use cheap
solder
or
solder of doubtful origin. Recommended solder
is
60/40
(60%
tin,
40%
lead)
rosin core.
Whenever one
(l)
wire is to be soldered to a connection,
the
instructions will
indicate
this
by
the
symbol
(S).
When
two
(2)
wires
are
to be soldered to a connection,
the
sym-
bol (S-2) is shown; when
three
(3)
wires
are
to be soldered,
the
symbol (S-3) appears, etc.
There
may
be
as
many
as
five
(5)
wires to be soldered to a connection.
If
no
symbol
is shown, do
not
solder;
further
wiring will be
made
to
that
connection before soldering.
Components
can
be identified
by
comparison with
the
pictorial diagrams. Capacitors
are
individually marked.
Resistors will be
marked
either
with
their
values,
or
with
the
color code specified
in
the
instructions.
The
first color
is
nearest
the
end
of
the
resistor,
and
any
fourth color
band
may
be ignored.
A
number
of
steps
in
the
instructions begin,
"Connect
one
end
of
a wire
...
", with
the
length
of
the
wire specified.
In
each case, first
cut
a piece of wire to
the
correct
length
from
the
roll
supplied
with
the
kit,
and
then
remove
about
%" of insulation from
each
end
before making
the
connec-
tion.
The
leads on components should be trimmed
as
they
are
used,
the
length chosen being
that
which permits a con-
nection to be
made
from
point
to
point
without
strain
on
terminals
or
components.
The
position of all wire
leads
should follow
that
shown
in
the
pictorial
diagram
as
closely
as
possible.
Care
must
be exercised to see
that
uninsulated
wires
do
not
touch
each
other,
and
cannot
do
so
through
vibration
or
sagging, unless, of course,
they
are
connected
to
the
same
point.
It
is especially
important
that
uninsu-
lated
wires
and
component
leads
or
terminals
do
not
touch
the
chassis
or
bottom
plate
accidentally.
Check
your
work
after
each
step,
and,
when
you
are
sat-
isfied
that
it
has
been
correctly done,
mark
the
space pro-
vided
and
go on
to
the
next
step.
Examine
the pictorial
diagrams often; if
you
check
your
work methodically,
your
amplifier should work
as
soon
as
the
wiring
is
complete.
One of
the
best
ways to
make
a good mechanical con-
nection is
to
bend
a small hook
in
the
end
of a wire,
and
then
to
crimp
this
hook
onto
the
terminal to be connected.
The
amount
of bare wire exposed
at
the
end
need
not
be
exactly
lit
-inch; however,
if
it
is too long,
there
is
danger
of
the
excess touching
another
terminal
or
the chassis.
There
is
no
need
to
wrap
the
wire
around
the
terminal more
than
one time,
as
this makes a connection
that
is
much
more
difficult
to
remove if
an
error
has
been made.
8
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