High Definition Stereo Preamplifier SP-12

Audio Research, Plymouth

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  • Year
  • 1982 ?
  • Category
  • Audio Amplifier or -mixer
  • Radiomuseum.org ID
  • 184246

 Technical Specifications

  • Number of Tubes
  • 5
  • Number of Transistors
  • Semiconductors present.
  • Semiconductors
  • Main principle
  • Audio-Amplification
  • Wave bands
  • - without
  • Power type and voltage
  • Alternating Current supply (AC) / 100-135 / 200-260 Volt
  • Loudspeaker
  • - For headphones or amp.
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: High Definition Stereo Preamplifier SP-12 - Audio Research, Plymouth
  • Shape
  • Rack
  • Dimensions (WHD)
  • 15.6 x 4.5 x 8.9 inch / 396 x 114 x 226 mm
  • Notes
  • Audio Research High Definition Stereo Preamplifier SP-12;
    Frequency response
    High level section: ±0.5dB, 4Hz to 30kHz. -3dB points below 1Hz and above 70kHz
    Magnetic phono: ±0.25dB of RIAA, 30Hz to 20kHz

    Harmonic distortion: Less than 0.02% at 2V RMS output, 20Hz to 20kHz
    Intermodulation distortion: Less than 0.07% at 2V RMS output

    Gain
    Magnetic phono input to tape output: 34dB
    Magnetic phono input to main output: 60dB
    High level inputs to tape output: 0dB
    High level inputs to main output: 26dB

    Input impedance
    50K ohms phono; 100K ohms high level
    Output impedance
    Less than 4000 ohms main output and tape output from phono. Recommended minimum load for maximum audio quality 60kohms and 300 pF maximum capacitance.

    Maximum inputs
    Magnetic phono, 600mV at 1kHz (3V RMS at 10kHz).
    High level inputs essentially overload-proof.
    Rated outputs
    2V RMS all outputs into 60kohm loads
    (Main output capability is 50V RMS output at ½% THD at 1kHz into a 500kohm load.)
    Power supplies
    Electronically-regulated solid-state supplies. Frequency-compensated high-voltage supplies have a total equivalent low-frequency stability of 1 farad of capacitance. Line regulation 0.05%.
  • Net weight (2.2 lb = 1 kg)
  • 9 lb (9 lb 0 oz) / 4.086 kg
  • Price in first year of sale
  • 1,195.00 $

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