Dual HS 148 Instrucciones De Manejo página 16

Replacing the drive belt
Adjustment of Tonearm set-down point
If record play is started automatically, the stylus is lowered
automatically into the run-in groove of the record.
Move the speed selector to "33". Removing the decorative
strip (press forward and lift it by its rear edge) will expose the
control (7) for tonearm set-down adjustment (Fig. 4).
Connecting signal sources
TUNER
TAPE
Tape recordings
Headphone connection
Servicing
All lubrication points are adequately supplied with oil prior to
delivery to the customer. Under normal conditions, your unit
should function properly for many years. Do not oil any part
of your unit yourself. Should your unit ever require service,
please take it to your Dual dealer, or ask him for the address of
the nearest authorized Dual service station. Please make sure
that only original Dual replacement parts are used.
If you need to send the unit acray, please ensure that it is pro-
perly packed, if possible in its som packaging material.
Technical data
Turntable
Dual 1257 hifi automatic turntable with multi-play facility
Total Wow and Flutter
according to DIN 45 507 +01%
Rumble (according to DIN 45 500)
unweighted >40 dB
weighted > 60 dB
Pick-up cartridge see separate data sheet
Output power (measured at 4 ohms, harmonic distortion < 1%)
music power 2 x 35 watts
continuous power 2 x 20 watts
Harmonic distortion measured at 10 watts and 1000 Hz< 0.3 %
Power band width
as laid down under DIN 45 500
Frequency response
(measured with tone controls at centre position)
30 Hz — 20 kHz + 1 dB
20 Hz — 30 kHz + 3 dB
20 Hz — 20 kHz
Inputs
Tuner
200 mV an 47 kOhm
Tape
200 mV an 47 kOhm
Noise
a) at nominal output:
Tuner, Tape >70 dB
typical value
75 dB
b) at an output level of 2 x 50 mW:
Tuner, Tape > 50 dB
typical value 55 dB
Channel separation
a) between inputs
> 70 dB
b) between channels (Tuner, Tape)
>45 dB
Damping factor
20
Tone controls
Bass
+16,— 16dBat40
Hz
Treble
+15, — 15 dB at 15 kHz
Balance control control range
12 dB
Volume with loudness
Outputs
2 speaker jacks in accordance with DIN 41 529
1 coaxial jack for 1/4 inch headphones
slow blow 630 mA at 230 volt
slow blow 125 Aat 115 volt
L 216 Loudspeakers
Frequency response
according to DIN standard 45 500
Nominal impedance
according to DIN standard 45 500
Power handling capacity
according to DIN standard 45 500
Music rating power
50 — 18.000 Hz
4 ohms
30 watts