Operation Of Controls - Luxman 308 Operation Manual

Playback from Tuner
Connect the tuner's Output terminals (left and right) to either
of the amplifiers AUX terminals (29 or 30) or to the Tuner
terminals (27).
The Input Selector Switch (15) must be set at the correspond-
ing position. As shown in the block diagramme, the Input signals
from the tuner are fed directly to the input selector circuit. After-
wards, the signals trace the same blocks as are explained in
the TAPE DECK section and are reproduced from the speaker
systems. Both for FM stereophonic and monaural broadcasting,
the Mode Selector Switch should be set at the STEREO po-
sition, for such accommodation to the input source can be made
in the tuner. Modulation hum in the AM programme can be
eliminated by varying the distance and angle of these components.
Input Level Control:
The TUNER, AUX-1 and AUX-2 terminals are all for auxiliary
input terminals for the reproduction of flat frequency response.
For the TUNER terminals (27), a LEVEL CONTROL
(28) Is pro-
vided. The input sensitivity is 100mV when the control is at the
extreme clockwise position. Any sensitivity exceeding 100mV
can be obtained by turning the control counter-clockwise.
If other programme sources are connected to the AUX termi-
nals, possible deviation of the input level among the various
sources can be adjusted by the LEVEL CONTROL if the pro-
gramme source with the highest output is connected to the
TUNER terminals.
tes
Operation
of Controls
Mode Selector:
This amplifier is for stereophonic reproduction and incorpo-
rates Independent amplifiers for two channels (right and left).
Without the Mode Selector, the signals fed to the right channel
terminal are reproduced at the right channel speaker only. The
Mode Selector is placed between the two amplifiers to change
the mode of reproduction.
Mode Selector Chart
connection
input output
knob position performance use
for normal
stereo playback
STEREO
NORMAL
normal stereo
playback
when program
STEREO R R /reversed stereo ,
Be source Is revers-
REVERSE L. L 'playback | ly connected
right input
signal is repro-
MONO R jaa duced from both
right and lett | to+ monaural
speakers
left input signal
is reproduced
from both
right and left
speakers
program source
playback
or playback
of monaural
record with a
stereo phono
pick-up
right and left
input signals
are integrated
R R MONO L+R,
Volume Control:
The variable resistor of this control yields an A type curve.
In the attenuation characteristics of A type, the turning angle ts
proportionate to the attenuation degree (dB), the dB value and
the volume audible to human ears. In other words, the rotation
of the control is in proportion to the sound volume felt by
human ears. The increasing degree of volume is felt quite natural-
ly as the control is turned itn the clockwise direction.
Attenuator Switch:
This switch should normally be kept fully clockwise for maxi-
mum sensitivity. When turned to the minimum position, the
volume is reduced by up to 18dB (about % power). If, however,
you should be using high efficiency loudspeakers, such as horn-
loaded types, setting the switch half way will make the main
volume control easier to use.
Another use for this switch is as follows; If you wish to use
the main power amplifiers separately, then this switch will adjust
their input sensitivities to match your other equipment.