Hitachi SR-903

Data[edit]

General

  • Manufacturer: Hitachi
  • Model: SR-903
  • Type: Receiver
  • Years of manufacture: 1977 - 1978
  • Made in: Japan
  • Color: Silver, Black
  • Remote control: no
  • Power consumption: 615 W
  • Dimensions: 490 x 144 x 400 mm (WxHxD)
  • Weight: 13.5 kg
  • Original price approx.: 1'298 DM


Connections

  • Number of inputs:
    • Phono: 1.9 mV / 47 kOhm, 220 mV max.
    • Aux: 150 mV / 50 kOhm
    • Tape Play 1, 2: 150 mV / 50 kOhm
    • Tape Play DIN 1, 2: 400 mV / 120 kOhm

Adapter: 150 mV / 50 kOhm

    • Antenna FM / MW: 75 Ohm / 300 Ohm
  • Number of outputs:
    • Tape Rec 1, 2: 150 mV
    • Tape Rec DIN 1, 2: 40 mV

Headphones

    • 2 pairs of loudspeakers


Technical Data

Amplifier

  • Continuous power (DIN)

8 Ohm: 2x 75 W (RMS, 20 - 20'000 Hz) 4 Ohm: 2x 110 W

  • Dynamic power
    • 8 Ohm: 2x 120 W
    • 4 Ohm: 2x 160 W
  • Total harmonic distortion: 0.2 % (at nominal power)
  • Attenuation factor: 45
  • Frequency response: 10 - 30'000 Hz, ± 1 dB
  • Signal-to-noise ratio:
    • Phono: 70 dB
    • High level: 87 dB
  • Tone control:
    • Bass: ± 10 dB at 100 Hz
    • Mid: ± 6 dB at 1 kHz

Treble: ± 10 dB at 10 kHz

  • Loudness: + 9 dB at 100 Hz, + 4 dB at 10 kHz
  • High Filter: - 8 dB at 10 kHz, 12 dB / octave
  • Low Filter (Subsonic): - 8 dB at 50 Hz, 12 dB / octave
  • Mute:


Tuner

  • Reception: FM, MW
  • Frequencies:
    • FM: 88 - 108 MHz

MW: 530 - 1'605 kHz

  • Frequency response: 30 - 15'000 Hz, ± 1 dB
  • Input sensitivity:
    • FM: 1.5 µV
    • MW: 20 µV
  • Distortion factor:
    • FM: 0.15% (mono), 0.25% (stereo)

MW: 0.2% Signal-to-noise ratio:

    • FM: 74 dB
    • MW: 68 dB
  • Channel separation: 45 dB
  • selectivity:
    • FM: 80 dB
    • MW: 40 dB
  • Equal wave selection:
    • FM: 1 dB
  • Spurious wave selection: 100 dB
  • Mirror frequency attenuation:
    • FM: 85 dB

MW: 70 dB

  • IF attenuation:
    • FM: 100 dB
    • MW: 90 dB
  • AM suppression: 55 dB


Special Features

  • FM muting


Remarks[edit]


Pictures[edit]

  • Extract from brochure: Hitachi SR-503 L, SR-603, SR-703, SR-803, SR-903

Hitachi SR-503 L-603-703-803-903-Prospekt-1.jpg


  • Excerpt from brochure: Hitachi SR-903

Hitachi SR-903-Prospekt-1.jpg


Reports[edit]

Links[edit]