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Simpson 1000 - Page 33

Simpson 1000
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THEORY
OF
OPERATION
Switch
A
connects
the
voltage
source
for
all
the
socket
terminals
#1;
switch
B
connects
the
voltage
source
for
all
#2
terminals;
and
this
system
follows
in
sequence
so
that
switch
I
connects
the
#9
terminal
of
the
noval
socket
and
the
center
of
the
loktal
socket.
The
J
switch
connects
the
voltage
source
for
the
cap
lead
which
comes
out
the
top
of
the
front
panel
between
the
5-
and
6-pin
sockets.
K
SWITCH
Toggle
switch
K
is
a
three
section
switch
which
has
four
positions
(0
through
3).
A
combination
of
voltages
is
se-
lected
with
this
switch
to
furnish
the
grid
bias,
screen,
and
plate
voltages
for
each
application.
The
bias
voltage
is
applied
across
the
BIAS
potentiometer,
and
a
proportional
part
of
this
total
available
voltage
can
then
be
tapped
through
the
panel
marking
system
with
the
control
knob.
This
system
contributes
excellent
accuracy
of
bias
voltage
values
for
the
settings
of
the
tube
tester.
The
screen
voltage
is
applied through
the
LINE
TEST
push
switch
directly
to
the
screen
circuit
of
the
tube
under
test.
The
plate
voltage
is
applied
through
the
LINE
TEST
switch
to
the
tube’s
plate
circuit.
In
its
0
position,
the
K
switch
selects
45
volts
for
bias,
90
volts
for
screen,
and
180
volts
for
plate
voltages.
In
the
1
position,
the
K
switch
selects
15 volts
for
bias,
with
the
screen
at
90
and
the
plate
at
180
volts.
In
the
2
position,
the
K
switch
selects
15
volts
bias,
45
volts
screen,
and
90
volts
plate
voltage.
And
in
the
3
position,
the
K
switch
selects
a
bias
voltage
of
5
volts,
with
a
screen
voltage
of
15
and
a
plate
of
45.
31

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