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Heathkit TC-2 - Mechanical Assembly

Heathkit TC-2
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1
The
third
basic
cireuit
is
in
the
SET
LINE
position.
The
SET
LINE
control
in
the
primary
of
the
power
transformer,
varies
the
voltage
across
the
primary
thereby
in
turn
the
secondary
voltage.
The
meter
with
the
voltage
divider
network
and
the
rectifier
now
in
the
circuit
will
indicate
the
proper
secondary
voltage
when
the
needle
is
sel
on
(he
SET
LINE
marking.
The
purpose
of
the
SET
LINE
is
to
assure
proper
voltages
on
the
tube
under
test,
rather
than
have
false
indication
as
a
result
of
high
or
low
power
line
voltages.
NOTE:
In
some
sections
of
the
country
where
AC
line
supply
voltages
are
somewhat
higher
than
the
average,
il
may
be
necessary
to
further
compensate
for
increased
voltage
by
installing
a
resistor
in
series
with
one
leg
of
the
transformer
primary
winding.
The
exact
resistance
value
required
can
best
be
determined
experimentally,
but
it
will
generally
fall
between
50
and
100
ohms.
Due
to
the
power
requirements
of
the
Tube
Checker
it
would
be
advisable
that
the
resistor
have
a
rating
of
at
least
20
watls
and
should
preferably
be
of
the
wire-wound
type.
MECHANICAL
ASSEMBLY
Study
Pictorial
1
very
carefully,
and
note
the
placement
of
various
parts.
This
pictorial
shows
the
aluminum
panel
as
viewed
from
the
rear.
Throughout
this
manual,
a
system
of
alphabetical
designation
will
be
used
for
each
part,
and
each
terminal
connection
of
the
part
will
be
assigned
anumber.
Therefore,
the
first
tube
socket
in
the
upper
lefl
corner,
which
is
a
loclal
socket
,
is
designated
as
A,
and
the
eight
pins
will
be
identified
as
Al,
A2,
A3,
etc.
Actually
marking
the
panel
openings
will
prove
helpful.
This
same
procedure
wili
be
used
throughout
instrument
construction.
Please
note also
that
some
parts
such
as
the
lever
switches,
have
been
assigned
a
dual
alphabetical
designation,
such
as
EE,
FF,
GG,
etc.
Pag:

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