What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.




H.H. Scott '59





Hitachi HA-3500 (1979)

 Hitachi HA-3500 Stereo Integrated Amplifier (1979)
Features:
Low-distortion power amplifier
Power level meters for output power readout
Connection facilities for two pairs of speakers
New ICs in the Equalizer and pre-amplifier
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:
30 watts per channel, (min. RMS, at 8 Ω from 20-20,000 Hz, with no more than 0,05% THD)
33 + 33 W/channel (both channels driven into 8 Ω, 20-20,000 Hz, 0,05% THD)
36 + 36 W/channel (8 Ω, 1 kHz, 0,05% THD)
38 + 38 W/channel (4 Ω, 1 kHz, 0,15% THD)
Power Bandwidth:  10 Hz - 50 kHz
Frequency Characteristics:
Tuner, Tape 1, 2:  10 Hz - 40 kHz (+0,5 -1,5 dB)
Phono :  RIAA ±0,3 dB
Total Harmonic Distortion:
Less than 0,05% at rated output
Less than 0,03% at ½ rated output
Intermodulation Distortion:  less than 0,03% (at ½ rated output)
Input Sensitivity/Impedance:
Phono :  2,5 mv / 47 k Ω
Tuner :  150 mv / 33 k Ω
Tape 1, 2 :  150 mV / 33 k Ω
Output level:
Tape Out :  150 mV
Phono Overload Level (at 1 kHz, 0,05% THD):  200 mV
Signal-to-Noise Ratio (IHF a network):
Phono :  75 dB
Tuner, Tape 1,2 :  90 dB
Damping Factor:  30 (1 kHz , 8 Ω)
Bass Control:  ±10 dB at 100 Hz
Treble Control:  ±10 dB at 10 kHz
Loudness Control:  +9 dB at 100 Hz; +4 dB at 10 kHz
Subsonic Filter:  20 Hz (-12 dB/oct)
Semiconductors:  4 ICs, 24 transistors, 18 diodes (2 LEDs)
Power Supply:  AC 120 V 60 Hz; 220 V 50/60 Hz; 240 V 50/60 Hz; 120/220/240 V 50/60 Hz
Power Consumption:  160 W (at rated output) 240 W (at rated output)
Dimensions (W x H x D):  435 x 110 x 275 mm

Weight:  6 kg

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