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GROUND
....
A point in any electrical
system that has zero
voltage,
usually
the
chassis
of
any
electrical
component.
HEAD
....
An
electro-magnetic
device
across
which
the
tape is drawn
and which magnetizes
the iron oxide
coating
of
tape.
HEAD ALIGNMENT
....
In
tape recorders,
the
correct
position
of the
tape
head
and
gap,
with,
respect
to
the
magnetic
tape.
HEADPHONES ....
Small
sound
reproducers
in a suitable
frame
for wearing
about
the head.
Close coupled
to the ears for private
listening.
HUM ....
Low frequency
noise
in an
audio
component
usually induced from the power
line
or
stray magnetic
fields.
Hz
Hertz:
cycles per second.
IHF
The
Institute of High Fidelity, the official association
of the manufacturers
and
certain
related
organiza-
tions in
the
high fidelity
field.
IMPEDANCE
....
Measured
in ohms,
it
is
the AC resistance
of
any
electrical
system.
Generally
referred
to as
either "high"
or "low"
impedance.
For
best
results
in connecting
two
components,
output
and
input
impedances
must match.
IN-LINE HEADS ....
Arrangement
of stereophonic
heads on
a tape
recorder
in which
the
head
gaps are mounted
one
directly
above
the other.
Also
called
"stacked
heads
".
1
J
INPUT
....
The
receptacle
or jack through
which
a
signal
is
fed into
an amplifier.
IPS ....
Abbreviation
for
tape speed
in inches
per second.
INVERTER
....
A
device
to change
one
type of
electrical
current
to
another.
Frequently
used
to obtain
110
volts
alternating
current
for operation
of
a
tape
recorder
in an
automobile.
JACK ....
Receptacle
or plug
connector
leading
to the
input
or
output
circuit
of
a
tape
recorder
or
other
component.
LEVEL
INDICATOR
....
Indicates the
level
at which the record-
ing
is
being made
and
serves as a
warning
against
under
recording
or over
recording.
It
may
be in the
form
of a
neon bulb, "Magic
Eye"
or a VU meter.
LOUDNESS
CONTROL ....
Sometimes
known
as "contour".
Compensates
for loss of
tones at
the
extreme
end
of
the audio
range
when
listening
at soft
volumes
or
through
small
speakers.
A
typical
control of
this
sort
will
usually
boost the bass.
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