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Simpson 1000 - Theory of Operation

Simpson 1000
60 pages
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THEORY
OF
OPERATION
which
provides
normal
operating
voltages
to
all
the
ele-
ments
of
a
tube
under
test,
and
then
establishes
a
meter
in
the
plate
circuit
of
the
tube
to
indicate
the
tube
condition
according
to
the
regulated
plate
current.
The
meter
sensi-
tivity
is
varied
so
that
a
tube
which
is
operating
correctly,
according
to
manufacturer's
specifications,
deflects
the
pointer
to
the
100%
indication
on
the
meter.
Other
tube
con-
ditions
will
cause
proportional
deflection
of
the
pointer
to
indicate
the
relative
quality
existing
in
the
tube.
Many
new
tubes
will
show
indications
above
100%
and
this
is
normal.
Tube
characteristics
are
maintained
on
a
toler-
ance
basis,
and
many
new
tubes
will
have
more
than
the
specified
normal
value
of
Plate
Conductance.
In
the
same
way,
there
will
be
many
new
tubes
which
will
have
indic-
ations
below
100%,
and
these
represent
the
tubes
which
the
manufacturer
allowed
to
be
shipped,
even
though
they
have
values
below
the
normal
level,
but
within
the
tolerance
range.
BLACK
VALUES
ARE
SATISFACTORY
In
general,
the
leakage
resistance
between
tube
elements
in
a
vacuum
tube
should
be
at
least
250,000
ohms.
In
the
Model
1000,
each
short
test
consists
of
separating
one
ele-
ment
at
a
time
from
all
the
others
in
the
tube
and
measuring
the
resistance
between
the
isolated
element
and
all
the
others.
The
resistance
is
indicated
on
the
OHMS
scale
of
the
meter.
Satisfactory
values
are
marked
in
black,
and
un-
satisfactory
values
are
marked
in
red.
The
short
tests
listed
will
be
sufficient
to
indicate
any
unsatisfactory
resistance conditions
in
any
tube
under
test.
27

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