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Hitachi HA-2500 amplifier

Features:
Low-distortion power amplifier
Connection facilities for two pairs of speakers
New ICs in the Equalizer
Subsonic filter that cuts out rumble and wow in the ultra-low frequencies without impairing the sound quality
LED program source indicators

Specifications
Power Output (Both channels driven):
20 W/ch + 20 W/ch ( into 8 Ω , 40 - 20,000 Hz ,T.H.D. 0,07%)
23 W/ch + 23 W/ch (into 8 Ω , 1 kHz, T.H.D. 0,07%)
25 W/ch + 25 W/ch (into 4 Ω , 1 kHz, T.H.D. 0,07%)
Power Bandwidth:  20 Hz - 20 kHz
Frequency Characteristics:
Tuner, Tape :  20 Hz - 40,000 Hz  (+1, -1,5 dB)
Phono :  RIAA ±0,7 dB
Total Harmonic Distortion ( at 8 Ω )
At rated output :  less than 0,07%
At 1/2 rated output :  less than 0,05%
Intermodulation Distortion
At 1/2 Rated Output:  less than 0,05%
Input Sensitivty/impedance:
Phono :  2,5 mv /47 k Ω
Tuner :  150 mV/40 k Ω
Tape :  150 mV/40 k Ω
Output Level
Tape Output:  150 mV (phono, Tuner)
Phono Overload Level :  140 mV ( at 1 kHz, T.H.D.0,05%)
Signal-to-Noise Ratio (IHF a Network):
Phono :  70 dB
Tuner, Tape :  90 dB
Damping Factor:  30 (1 kHz, 8 Ω )
Bass Control:  ±8 dB at 100 Hz
Treble Control :  ±8 dB at 10 kHz
Loudness Contour:  =9 dB (at 100 Hz)
Subsonic Filter:  20 Hz (-6 dB/oct)
Semiconductors:  2 ICs,  25 Transitors, 13 Diodes, 2 LEDs
Power Supply:  120 V, 220 V, 240 V, 50/60 Hz
Power Consumption:  170 W (at rated output)
Dimeensions (W x H x D):  435 x 110 x 275 mm
Weight:  5,4 kg

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