Taylor 45C - Page 14

Very
occasionally
valves are encountered which cannot be
tested owing
to the
base
connections.
Sometimes
this is
due to a heater centre tap
being connected to a pin
which
cannot be
isolated,
and
sometimes to
internal
connections
being made on certain
pins
of
glass-based
valves.
Filament
centre
taps
are
taken if possible
to
a blank
position on
the selectors.
E.G.,
type 3S4 has
a
filament
centre
tap
on
pin
5,
and selector
C
is on
position
8
which
leaves
circuit 6
disconnected.
14