Hitachi HA 270 Service Manual

Page 1

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SERVICE MANUAL

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No. 146

SPECIFICATIONS

Output
RMS power
(both channels
driven)

Power bandwidth
Frequency charac-
leristics
(AUX, TAPEI
Harmonic distortion
lat rated output)
(at 1/2 rated out-
put)
Intermodulation
distortion
(at 1/2 rated
output)
Input sensitivity
(Impedance)
PHONO
AUX
TAPE

25 watts per channel, min,
HMS, at 8 ohms from 20 Hz
to 20 kHz with no more than
0.1% total harmonic distor»
tion.

30 W/ch + 30 W/ch

(8 ohms, 1 kHz, T,H.D. 0.1%)
35 W/ch + 35 W/ch

(4 ohms, 1 kHz, T.H.D. 0.1%)
IO Hz - 40 kHz

15 Hz - 30 kHz l :; cal
Less than 0.1%

Less than 003%

Less than 0.05%

3.0 mV (45 k-ohms)
150 mV (35 k-ohms)
150 mV (35 k-ohmsl

FEATU RES

Output level
TAPE OUT

Phono overload level
(at 1 kH1,T.H.D.
011%)

Signal-to-noise ratio
lIHF, A network)
PHONO
AUX, TUNER,
TAPE

Damping factor

Equalizer

Bass control

Treble control

Loudness control

Semi-conductors
Power supply
Power consumption

Dimensions
Weight

Specifications and design: may be changed without notice for improvement.

150 mV (PHONO, AUX,
TUNER)

160 mV

69 dB

85 dB

34 (1 kHz,8 ohms)

RIAA :05 d8

:9 dB (100 Hz)

29 d8 (10 kHz)

+6 dB (100 Hz)

+5 113 (10 kHz)

2 le, 20 transistors and 16 diodes
AC 120 V 60 Hz or

~ 120 V/220 V/240 V

50/60 Hz

140 W (at 1/3 rated output)

230 W (at rated output)

390 (W) x 143 (Hl x 279 (D) mm
6.5 kg

1. Pure complementary OCL system

2. Power level meters for output power readout
3. Connection facilities for two pairs of speakers

4. Protection circuit seeking ultimate in safety
5. Low filter that cuts out rumble and wow in the
ultra-low frequencies without impairing the

sound quality

STEREO AMPLIFIER

August 1978