OnIy
a small
percentage
of
factory
service.
Of
these,
improper
soldering.
PROPER SOLDERING
PROCEDURE
Heathkit
purchasers
find
it necessary
to return
an instrument
for
by
far
the largest
proportion
function
improperly
due to
poor
or
Correct
soldering
technique is
extremely
important.
Good
solder
joints
are
essential
if
performance
engineered
into the kit is to be fully
realized.
If
you
are
a beginner with
no
perience
in
soldering,
a
half-hour's
practice
with odd lengths
of
wire and
a tube
socket witl
a
worthwhile
investment.
High quality
solder of the
proper grade
is most
important.
There
are several
different brands
of
solder
on the
market, each clea.rly marked
"Rosin
Core Radio
Solder.
"
Such solders consist
of
an
alloy of tin
and lead, usually in the
proportion
of 50:50.
Minor
variations
exist in the mix-
ture
such
as 40:60, 45:55,
etc. with the first figure
indicating
the tin
content.
Radio solders are
formed
with one
or more tubular
holes through the
center,
These holes
are
filled
with a rosin
compound
which acts
as a
flux.or
cleaning agent
during the
soldering operation.
No
SEPARATE
FLIrx oR
PASTE oF ANY KIND
sHouLD
BE
usED. we specifically
caution
against
the
use of
so-called
"non-corrosive"
pastes.
Such compounds,
although not
corrosive
at
room
temperatures,
will form residues
when heated.
The
residue
is deposited on
sumound-
ing
surfaces
and attracts moisture.
The
resulting
compound
is not only
corrosive but actually
destroys
the insulation
value of non-conductors.
Dust and dirt
will tend
to
accumulate on these
"bridgss"
and
eventually will create erratic or
degraded
perforrnance
of
the
instrument.
If terminals
are
bright
and
clean
and wires
free
of
wax, frayed
insulation
and other foreign sub-
stances, no
difficulty
will be experienced
in soldering.
Crimp or otherwise
secure the wire
(or
wlres) to
the terminal,
so a
good
joint
is made
without relying
on
solder for
physical
strength.
Tomake
a
good
solder
joint,
the cleantip of ihe
soldering
iron
should
be
place-d
igainst the
joint
to
be soldered
so that the terminal is heated
sufficiently
to
melt solder.
The
iolder is then
placed
against
both the
terminal and the tip
of the
iron
and
will immediatelv
flow out over the
joint.
Refer to the
sketch below.
Use
only
enough
solder
to cover
wires
ai the
junction;
it is
not necessary
to fiII
the entire hole in the terminal
with solder.
Excess
solder may
flow
into
tube
socket
contacts, ruining
the socket, or it
may
creep
into
switch contacts
and destroy their
spring
action.
Position the
work so that
gravity
tends
to keep
the
solder
where
you
want
it.
ALI.OW
SOLDER
TO
FIOW
the
ex-
be
F,
NOTE:
ALL
GUARANTEES
INSTRUMENTS
IN WHICH
USED.
WHEN
IN
DOUBT
ROLL
PLAINLY
MARKED
ARE VOIDED
AND
WE WILL
NOT
REPAIR
OR SERVICE
ACID
CORE SOLDER
OR
PASTE
FLUXES
HAVE BEEN
ABOUT SOLDER,
IT
IS
RECOMMENDED
THAT A NEW
''ROSIN
CORE RADIO
SOLDER''
BE
PURCHASED.
Page
10
CRIMP
WIRES
EEAT
CONNECTION
APPLY
SOLDER
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