Hitachi SR-904

Data

General

• Manufacturer: Hitachi
• Model: SR-904
• Type: Receiver
• Years of manufacture: 1979 - 1980
• Made in: Japan
• Color: Silver
• Remote control: no
• Power consumption: 250 W
• Dimensions: 490 x 144 x 400 mm (WxHxD)
• Weight: 13,5 kg
• Original price approx.: 1'200 DM

Connections

• Number of inputs:
  • Phono: 2.5 mV / 47 kOhm, 220 mV max.
  • Aux: 200 mV / 50 kOhm
  • Tape Play 1, 2: 200 mV / 50 kOhm
  • Tape Play DIN 1, 2: 500 mV / 80 kOhm

Adapter: 200 mV / 50 kOhm

• • Antenna FM / MW: 75 Ohm / 300 Ohm
• Number of outputs:
  • Tape Rec 1, 2: 200 mV
  • Tape Rec DIN 1, 2: 50 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 100 W

• Dynamic power
  • 8 Ohm: 2x 150 W
  • 4 Ohm:
• Total harmonic distortion: 0.09% (at nominal power)
• Attenuation factor: 45
• Frequency response: 10 - 40'000 Hz, ± 1,5 dB
• Power bandwidth: 8 - 40'000 Hz
• Signal-to-noise ratio: (extraneous voltage)
  • Phono: 75 dB
  • High level: 87 dB
• Tone control:
  • Bass: ± 10 dB at 50 Hz, 100 Hz
    • Tilt frequencies: 150 Hz, 300 Hz
  • Mids: ± 6 dB at 1 kHz

Treble: ± 10 dB at 10 kHz, 20 kHz

• • • Tilt frequencies: 3 kHz, 6 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, + 0,5 dB, - 1 dB
• Input sensitivity:
  • VHF: 1.6 µV

MW: 20 µV

• Distortion factor:
  • FM: 0.2% (mono), 0.3% (stereo)

MW: 0.2% Signal-to-noise ratio:

• • FM: 74 dB / 68 dB (mono/stereo).
  • MW: 50 dB
• Channel separation: 45 dB
• Selectivity:
  • FM: 85 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

• Pre-/power stage separable
• 2 VU meters
• VHF Muting, Auto Lock

Comments

• Other models in the same series:
• Hitachi SR-504
• Hitachi SR-604
• Hitachi SR-804
• Hitachi SR-904
• Hitachi SR-2004

Pictures

• Image: Hitachi SR-904

Reports

• Review at "Good Old Hifi": [[1]]

• Report at "Good Old Hifi": [[2]]