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How to make the most effective use of the
GAIN SELECT switches
(@ and
LOUDNESS switch 4?
If the LOUDNESS
switch @ is depressed and the
Volume control ® turned, then the bass and treble
responses vary, as is shown in the figure. There-
fore, if you set your maximum
listening volume
with the GAIN SELECT switchesd@ so that the Vol-
ume control @ can be set to its maximum position
(extreme right position), you can then proceed to
vary the volume with the Volume control @ while
my
cE
ee
maintaining the optimum aural compensation.
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Setting the level of the GAIN SELECT switches @
Boop ee
Te
S
LLIN
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TP TTT
( 1 ) Release
all the GAIN
SELECT
switches 46) and
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TT TIN
TTT
OT:
7
the LOUDNESS switch ©.
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[COIN
E TE s00n TT
(2) Set the Volume contro! ® to your maximum
pT
Ne TTT
a
(3)
listening volume.
Depress the GAIN
SELECT
switches 4 with
the nearest value to that of the Volume con-
trol's @. (For example, say the Volume con-
{A 1 kHz attenuation
tallies with the level indicated by
the LEVEL ATTENUATOR volume control (%).)
LOUDNESS CHARACTERISTICS
ee
a
P TTT
OT NA
LEVEL ATTENUATOR position 0 dB
2
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TIN
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LL
df
Pt
TN a
2
trol @ is set to -16 dB. The GAIN SELECT
;
fea
TT
TAN
a
switches 8 feature an adding system, so all
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+
Let
LL
a
(4) Depress the LOUDNESS switch @.
cacti: a
PHONO 1 CARTRIDGE
LOAD selector
This switch can be used to vary the high frequency characteristics by selecting the capacitance of the capacitors
(100, 200, 300 pF) which are connected to the PHONO 1 input.
Every cartridge has a resonance frequency, but most of them are designed so that the resonance point lies beyond
the audio frequency range.
Nevertheless, some cartridges have a resonance point near 20 kHz, and since the treble characteristics develop a
peak, this peak is sometimes unpleasant to listen to. In such cases, this sound can be made perfectly acceptable to
the ear by selecting the capacity to 200 pF or 300 pF. Select the most suitable position for the sound you find
the most pleasing.
If you want the PHONO
1 and PHONO 2 to be subject to the same conditions when you want to compare
cartridges, set the PHONO 1 CARTRIDGE
LOAD selector (to 100 pF.
CAUTIONS
1. On the connection of record player and tape deck
Be sure to use a thick shielded cable with low stray capacitance for connection.
If a parallel vinyl cord or a
thin shielded cable is used, inductive hum may be produced and the high frequency characteristics will deteriorate
considerably. Therefore, it is recommended that you use as thick and short cable as possible.
2. Power transistor protection
When the speaker systems (4 ohms) are connected to both the A and B speaker terminals and the speakers switch
is set to A+B, and when these speaker terminals are not connected properly, this causes a short, and the power
transistor protection circuit is actuated. The sound is then no longer heard through the speakers.
In such a case, set the power switch to OFF, check whether the speakers switch is set to A+B or whether the
speaker terminals have been shorted, and wait at least 30 seconds before setting the power switch to ON again.
3. Amplifier heat loss
Since a large output power amplifier is used, the amplifier radiates heat. Although ventilation holes are provided
in the upper part of the case and the bottom plate to improve heat transmission, when it is placed in direct sun-
light or when anything is placed directly on the amplifier, the ventilation may be deteriorated resulting in mal-
function. If the internal temperature rises, the transistors may be damaged. Take care not to block the ventilation
holes.
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