Taylor 45C - ;5 Valve Holders; Operation; 2;1 Application of Tests

The
inner
arc is
calibrated
in Megohms and is used on Cathode
Leakage
Test
only.
1 /
5 VALVE
HOLDERS
There
are
20
valve
holders
and three;
sockets
on the
top of
the
instrument.
The
valve
holder
nomenclature
and
numbering
system are given in the
Valve
Chart.
The Red,
Black
and
Green
sockets
are used
to connect the valve
top cap,
if
any, to
the
Anode, Cathode
or
Grid
circuits
respectively
as
required
by the nature of the test and
specified
in the Valve
Chart.
A clip
lead
is
supplied with
the instrument
for this
purpose.
2
.
OPERATION
2/1
APPLICATION
OF
TESTS
The seven different
tests
available
are briefly described
in
the
seven following
paragraphs
and are considered in
more detail in Section
3,
Which tests should be applied, and the
order in
which they
should be
carried out,
depends
on
the type of valve and
what is
known about its condition.
The
following
table lists
the
recommended sequence
of tests on
valves
of six
general
categories
.
VALVES
Main
Selector
Rectifier Diodes
Triode or
screen
grid
Gas
rectifier
Gas
triode
& tetrode
Magic
eye
Remarks
Rectifiers
3
— —
3
4
—
Diodes
3
—
—
—
__
Filament
1
1
1 1 1
1
Unless
Continuity
Element
2 2
2
cold
cathode
Shorts
Cathode
2
2
3 2
3
3 Unless
Leakage
Mutual
4
4
directly
heated
Conductance
Gas button
—
—
5
— —
5
The full
sequence
of
tests is
suitable
for
testing
valves of
unknown
condition. Under
these circumstances
it is
advisable
not
to
omit
the Element Shorts
test
otherwise the fuse
may
trip on
switching
to Mutual
Conductance.
Discretion can
often be
used
and
if,
for
example, a
valve,
working
in an
amplifier,
is suspected of low gain
it
can be tested
for
Mutual
Conductance
only.
Multiple
valves,
such
as
double triodes,
or diode triodes,
are
treated as
several
separate
valves,
the
proper
test
conditions
for each section being listed
in
the valve
chart.
This
applies
also
to
frequency
changers
(mixers)
which have separate
tests
for the
oscillator
and mixer
sections.
5