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Simpson 1000 - Page 15

Simpson 1000
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TUBE
INFORMATION
It
taps
a
portion
of
the
3000
ohms
to
be
used
in
series
with
the
meter
movement.
Leave
the
A
toggle
at
0.
This
setting
grounds
the
#1
terminal
of
the
octal
socket.
When
you
insert
the
tube
later,
its
suppressor
grid
will
be
at
ground
potential
through
the
connections
of
the
#1
base
pin.
Set
the
B
toggle
at
1.
This
setting
connects
the
‘hot’
side
of
the
filament
voltage
to
the
#2
terminal
of
the
octal
socket.
It
will
connect
6.3
volts
to
one
side
of
the
filament
through
the
#2
base
pin
when
you
place
the
tube
in
the
socket.
Set
the
C
toggle
at
5.
This
setting
provides
an
open
circuit
for
the
#3
terminal
of
the
octal
socket.
There
is
some
variation
of
the
use
of
the
#3
base
pin
from
one
tube
manufacturer
to
another,
but
none
will
have
a
func-
tional
element
of
a
6AG7
connected
through
this
base
pin.
An
open
circuit
in
the
tube
tester
will
assure
satis-
factory
testing
of
all
brands.
.
Set
the
D
toggle
at
4.
This
setting
connects
the
#4
ter-
minal
of
the
octal
socket
to
the
switch
section
in
the
LINE
TEST
switch
which
will
furnish
grid
bias
voltage
when
the
LINE
TEST
push
button
is
pressed.
At
pres-
ent,
this
switch
section
(in
LINE
TEST)
connects
the
#4
terminal
to
ground.
When
the
tube
is
inserted
in
the
socket,
its
grid
will
be
connected
through
base
pin
#4
to
ground.
It
will
be
transferred
to
grid
bias
after
the
short
tests.
.
Leave
the
E
toggle
at
0.
This
setting
connects
the
#5
terminal
of
the
octal
socket
to
ground.
When
the
tube
is
13

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