Heathkit TC-2 - Page 7

‘Type
2
-
for
cathode current
tubes
between
3
ma
and
15
ma,
These
are
usually
filament
type
tubes
with
the
exception
of
diodes.
‘Type
3
-
for
cathode
current
type
tubes
greater
than
8
ma.
These
are
usually
indirectly
heated
cathode
types
with
the
exception
af
diodes.
‘Type
4
-
for
gas
control
tubes,
gaseous
rectifiers,
and eye
or
target
tubes.
(c)
Set
filament
voltage
to
values
specified
by
manufacturer.
(a)
Set
all
levers
to
the
center
position.
(e)
Determine
the
first
filament
connection
from
the
tube
base
diagram
and
leave
its
connection
lever
in
the
center
position.
Is
connection
lever
can
be
found
as
follows:
Lever
A
corre-
ponds
to
pin
1,
Lever
Bto
pin
2,
Lever
C
to
pin
3,
etc.
{f)
Determine
the
second
filamentconnection
from
the
tube
base
diagram
and
set
its
connection
lever
to the
B (bottom)
position.
(g)
Determine
from
base
diagram
if
tube
has
a
filament
tap,
and
if
80,
set
connection
lever
corresponding
to
tap
to
the
B
(bottom)
position.
Also
determine
from
base
diagram
if
tube
has
panel
lamp.
(h)
If
the
tube
has
more
than
one
section
(duo
diodes,
duo
triodes,
etc.)
make
a
separate
test
for
each
section.
For
the
secticn
being
tested
follow
instructions
below.
For
the
section
not
being
tested,
move
all
corresponding
connection
levers
to
the
B
(bottom)
position.
If
tube
has
only
one
section,
follow
instructions
below.
(i)
Move
the
connection
lever
corresponding
to
the
cathode
to
the
B
(bottom)
position.
(j)
Move
allother
elements
of
the.
section
being
tested
(screens,
supressors,
grids,
plate,
etc.)
to
the
T,
top
position.
:
(k) Plug tube into correct socket.
()
Plug
instrument
into.
105-125
volt,
50-60
cycle
outlet
and
turn
power
on.
(m)
Adjust
SET
LINE
control
so
that
the
meter
indicates
line
test.
(n)
Hold
the
adjust
line
short-test
switch
in
thetest
position
and
adjust
plate
voltage
control
to
bring
the
pointer
to
the
middle
of
the
good
scale.
(If
possible,
make
this
adjustment
for
at
least
three
new
tubes
and
select
the
average
setting.
)
{o) List all these settings in the manual.
{p)
If
the
tube
is
of
the
multi-section
type
check
the
remaining
sections
in
the
manner
outlined
above
and
list
the
settings
in
the
manual.
SPECIAL SOCKET:
‘The
Heath
Company
can
supply
a
special
acorn
socket
which
can
be
installed
in
the
blank
socket
panel
position.
The
acorn
socket
is
available
from
the
Heath
Company
for
a
nominal
charge
of
$0.75,
including
installation
and
wiring
instructions.
It
will
be
necessary
to
enlarge
the
blank
socket
panel
opening
slightly
by
using
a
file,
and
to
drili
two
mounting
holes
for
the
acorn
sock-
et.
In
testing
tubes
of
more
than
one
top
contact,
a
small
grid
clip
lead
can
be
made
with
a
phone
tip
on
the
other
end
which
can
be
inserted
in
a
vacant
socket
contact
and
connected
into
the
tester
with
the
proper
lever
switch.
Page 23