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Simpson 1000 - Page 17

Simpson 1000
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14.
1»
16.
TUBE
INFORMATION
inserted
in
the
socket,
these
circuits
will
have
no
effect
because
they
are
not
connected
through
the
base
pins
or
in
any
other
way
to
the
tube
elements.
Set the
K
toggle
at
1.
When
the
K
toggle
is
set
in
its
#1
position,
180
volts
is
applied
to
the
section
of
the
LINE
TEST
switch
which
will
connect
the
plate
circuit
when
the
LINE
TEST
push
button
is
pressed.
The
K
switch
also
connects
90
volts
to
another
section
of
the
LINE
TEST
switch,
and
this
section
will
furnish
volt-
age
to
the
screen
circuit
when
the
LINE
TEST
button
is
pressed.
The
third
section
of
the
K
switch
connects
15
volts
across
the
BIAS
potentiometer.
Since
the
BIAS
control
was
set
at
60,
the
bias
voltage
will
be
correct
for
obtaining
evaluation
of
the
tube.
Set
the
L
toggle
at
1.
This
setting
of
the
L
toggle
places
a
calibrated
shunt
value
of
14.29
ohms
across
**meter
circuit!
referred
to
is
the
the
meter
circuit.
The
1000
ohms
of
the
movement
in
series
with
the
resist-
ance
tapped
in
the
RANGE
control.
The
shunt
acts
as
a
coarse
adjustment
of
sensitivity.
The
entire
shunted
meter
circuit
is
now
set
so
that
20
milliamperes
of
plate
current
through
the
6AG7
tube
will
cause
a
100%
Plate
Conductance
indication.
After
all
these
settings
have
been
completed,
place
the
tube
in
the
Octal
socket
and
allow
about
30
seconds
for
a
warm-up
period.
During
this
time
the
filament
has
6.3
volts
applied
across
it,
and
the
cathode,
control
grid,
screen,
suppressor,
and
plate
all
are
connected
to
ground.
The
meter
of
the
Model
1000
is
connected
to
in-
dicate
whether
or
not
the
LINE
ADJUSTMENT
control
15

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