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Simpson 1000 - General Description

Simpson 1000
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GENERAL
DESCRIPTION
The
meter
sensitivity
circuit
is
adjusted
experimentally
to
obtain
the
correct
indication
on
each
of
a
group
of
rated
tubes.
The
control
settings
indicate
information
which
will
use
to
duplicate
these
results
in
your
Tube
Tester
Model
1000.
PLATE
RESISTANCE
AND
TUBE
AGE
The
defined
relationship
between
the
parameters
of
any
amplifier
tube
states
that
Amplification
Factor
is
equal
to
Mutual
Conductance
times
Plate
Resistance,
The
Amplifi-
cation
Factor
of
any
tube
is
a
function
of
the
geometric
placement
of
its
elements
and
their
relative
areas.
This
will
not
change
throughout
the
life
of
the
tube.
However,
as
the
tube
ages,
its
Plate
Resistance
will
increase.
This
increase
in
Plate
Resistance
causes
the
Mutual
Conduct-
ance
to
decrease,
and
a
measurement
of
either
parameter
will
indicate
the
relative
value
of
the
tube.
By
comparing
the
measurement
to
the
expected
normal
value
for
a
new
tube
of
the
same
type,
you
can
judge
the
ability
of
the
tube
to
operate
as
it
was
originally
intended.
PLATE
RESISTANCE
AND
PLATE
CONDUCTANCE
The
Simpson
Tube
Tester
Model
1000
measures
Plate
Re-
sistance
through
its
mathematical
reciprocal,
Plate
Con-
ductance.
Thus
it
provides
a
dynamic
test
of
the
ability
of
the
tube
to
operate
in
a
circuit
application.
To
provide
you
with
an
easy
identification
of
the
relative
merit
of
a
tube
which
you
test,
each
measurement
indicates
a
percent
of
the
normal
Plate
Conductance
value
which
should
be
pres-
ent
in
the
tube
when
it
is
manufactured.

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