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