Heathkit AR-14 - Page 58

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INPUT CONNECTIONS
Shielded cables, terminated in standard phono
plugs, should be used to connect all signal sources
to the input sockets of your Receiver. The
following information gives the correct input
connections for the various types of signal
sources.
Phono Input
For magnetic or variable reluctance phono
cartridges.
Aux ii iary Input
For use with most high level signal sources such
as a television receiver or tape recorders with
preamplifier output. A record changer or a turn-
table equipped with a crystal or ceramic stereo
cartridge may also be connected to the AUX
INPUTS. However, the BASS control should be
turned up in order to compensate for the low
frequency losses when using these cartridges.
Ground Terminal
In some cases the mechanism of a turntable or
a changer is not connected to the audio cable
shield. To reduce hum in these cases, a separate
ground wire should be connected from the turn-
table to this ground terminal.
TAPE OUTPUT
When connecting this Amplifier to a tape re-
corder, the high level input of the recorder
should be used. This input is sometimes called
High Level, Radio, or Line Input. AT NO TIME
SHOULD A
TAPE RECORDER BE CONNECTED
TO THE
AMPLIFIER SPEAKER CONNECTIONS,
as serious damage could result to the Receiver.
AC OUTLETS
Switched AC Outlet
For supplying power to devices such as record
changers, which may then be controlled by the On-
Off switch on the Amplifier.
Normal AC Outlet
For supplying power to devices such as record
changers or tape decks, which maybe damaged if
power is removed without turning off the mechan-
ism.
Page 51
SPEAKER CONNECTIONS
( ) If your left speaker has a lug marked "com-
mon," or C, connect a wire from this lug to
the COM (common) connecting screw of the
LEFT SPEAKER output terminal. If your left
speaker lugs are not marked, connect a wire
from either of these lugs to the LE FT
SPEAKER output terminal.
( ) Connect the other left speaker wire to the
other LEFT SPEAKER connecting screw.
( ) If your right speaker has a lug marked
"common," or C, connect a wire from this
lug to the COM (common) connecting screw
of the RIGHT SPEAKER output terminal. If
your right speaker lugs are not marked,
connect a wire from either of these lugs to
the RIGHT SPEAKER output terminal.
( ) Connect the other right speaker wire to the
other RIGHT SPEAKER connecting screw.
Speaker Phasing
NOTE: If the "common" lugs of your left and right
speakers were marked, this phasing procedure
can be disregarded; the connections made in the
preceding steps provided proper phasing for your
speakers.
The two speakers should be connected so that
they are "in-phase." "In-phase" means that
both speaker cones move in the same direction at
the same time, when driven by identical signals.
(If multiple-speaker systems are used, phasing
refers to the low-frequency speaker in each
system.)
Speaker phasing can be determined easily in the
following manner: Disconnect both phono input
cables, and set the SOURCE switch to the
PH ONO @ input. Introduce a hum in both chan-
nels by inserting a length of bare wire or a
screwdriver in one of the empty input sockets;
then advance the VOLUME controls until a hum
is heard.
Place the speakers side by side. Note the loud-
ness of the hum when you stand directly in front
of and between the speakers. Now interchange the
two speaker wires on one channel. When the
loudest hum is heard the speakers are in phase.