Lafayette TE-50 - Page 9

=
CAUSE:
An
emission
test
is
only
one
type
of
test
that
can
be
applied
to
a
tube.
It
indicates
the
amount
of
electrons
that
leave
the
cathode
of
the
tube.
Although
this
test
will
indicate
the
condition
of
the
tube
in
most
cases,
certain
other
tests
may
be
necessary
to
fully
evaluate
a
tube’s
condition.
Amplification
factor,
mutual
conductance
and
transconductance
are
some
of
the
factors
that
may
cause
a
tube
to
act
erratically.,
An
emis
ion
test
will
not
show
up
these
tube
characteristics.
SYMPTOM:
The
meter
does
not
read
to
full
scale
on
any
tube.
Even
new
tubes
do
not
bring
the
meter
to
full
scale.
CAUSE:
This
condition
is
normal.
The
circuit
has
been
designed
so
that
a
normal
good
tube
will
never
read
full
scale
on
the
meter.
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ANP,
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SCHEMATIC
DIAGRAM