Hitachi SR-903

Data

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

• Other models in the same series:
• Hitachi SR-503 L
• Hitachi SR-603
• Hitachi SR-703
• Hitachi SR-803
• Hitachi SR-903

Pictures

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

• Excerpt from brochure: Hitachi SR-903