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Audio Research SP3-A1 Tube Preamplifier * 2012 Factory Upgraded * Walnut Case * Box

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Audio Research SP3-A1 Tube Preamplifier * 2012 Factory Upgraded * Walnut Case * Box

Audio Research SP3-A1 specs
The Audio Research SP3-A1 is a vintage, all-tube stereo preamplifier manufactured around 1975
. It was highly regarded in its day for its sonic performance and reliability. 
Technical specifications 
  • Frequency response: 15Hz to 30kHz, ±1dB.
  • Distortion: Less than 0.005% total harmonic distortion (THD) and intermodulation distortion (IM) at 5V RMS output into an IHF load.
  • Maximum output: 25V RMS at 1kHz.
  • Signal-to-noise (S/N) ratio:
    • High-level inputs: Greater than 90dB below rated output (unweighted, wide-band).
    • Magnetic phono inputs: Greater than 70dB below rated output, 20Hz to 20kHz, referenced to a 10mV input.
  • Input impedance:
    • Magnetic phono: 50K ohms typical (150pf shunt).
    • High-level: 100K ohms typical.
  • Output impedance: Less than 600 ohms at 1kHz for all outputs. Recommended load is 20K ohms or greater.
  • Maximum inputs:
    • Magnetic phono: 300mV RMS @ 1kHz.
    • High-level: Overload-proof.
  • Tube complement: Eight 12AX7 dual triodes.
  • Tone controls: Bass and treble, variable ±18dB at 10Hz and 15kHz, respectively
    1558"×512"×1212"15 and five-eighths " cross 5 and one-half " cross 12 and one-half "
  • Upgraded by Audio Research in June 2012
  • Power Supply Update
  • New Tubes & RIAA Trim
Audio Research SP3-A1 specs
The Audio Research SP3-A1 is a vintage, all-tube stereo preamplifier manufactured around 1975
. It was highly regarded in its day for its sonic performance and reliability. 
Technical specifications 
  • Frequency response: 15Hz to 30kHz, ±1dB.
  • Distortion: Less than 0.005% total harmonic distortion (THD) and intermodulation distortion (IM) at 5V RMS output into an IHF load.
  • Maximum output: 25V RMS at 1kHz.
  • Signal-to-noise (S/N) ratio:
    • High-level inputs: Greater than 90dB below rated output (unweighted, wide-band).
    • Magnetic phono inputs: Greater than 70dB below rated output, 20Hz to 20kHz, referenced to a 10mV input.
  • Input impedance:
    • Magnetic phono: 50K ohms typical (150pf shunt).
    • High-level: 100K ohms typical.
  • Output impedance: Less than 600 ohms at 1kHz for all outputs. Recommended load is 20K ohms or greater.
  • Maximum inputs:
    • Magnetic phono: 300mV RMS @ 1kHz.
    • High-level: Overload-proof.
  • Tube complement: Eight 12AX7 dual triodes.
  • Tone controls: Bass and treble, variable ±18dB at 10Hz and 15kHz, respectively
    1558"×512"×1212"15 and five-eighths " cross 5 and one-half " cross 12 and one-half "
  • Upgraded by Audio Research in June 2012
  • Power Supply Update
  • New Tubes & RIAA Trim
$960.00

Original: $3,200.00

-70%
Audio Research SP3-A1 Tube Preamplifier * 2012 Factory Upgraded * Walnut Case * Box—

$3,200.00

$960.00

Description

Audio Research SP3-A1 specs
The Audio Research SP3-A1 is a vintage, all-tube stereo preamplifier manufactured around 1975
. It was highly regarded in its day for its sonic performance and reliability. 
Technical specifications 
  • Frequency response: 15Hz to 30kHz, ±1dB.
  • Distortion: Less than 0.005% total harmonic distortion (THD) and intermodulation distortion (IM) at 5V RMS output into an IHF load.
  • Maximum output: 25V RMS at 1kHz.
  • Signal-to-noise (S/N) ratio:
    • High-level inputs: Greater than 90dB below rated output (unweighted, wide-band).
    • Magnetic phono inputs: Greater than 70dB below rated output, 20Hz to 20kHz, referenced to a 10mV input.
  • Input impedance:
    • Magnetic phono: 50K ohms typical (150pf shunt).
    • High-level: 100K ohms typical.
  • Output impedance: Less than 600 ohms at 1kHz for all outputs. Recommended load is 20K ohms or greater.
  • Maximum inputs:
    • Magnetic phono: 300mV RMS @ 1kHz.
    • High-level: Overload-proof.
  • Tube complement: Eight 12AX7 dual triodes.
  • Tone controls: Bass and treble, variable ±18dB at 10Hz and 15kHz, respectively
    1558"×512"×1212"15 and five-eighths " cross 5 and one-half " cross 12 and one-half "
  • Upgraded by Audio Research in June 2012
  • Power Supply Update
  • New Tubes & RIAA Trim
Audio Research SP3-A1 Tube Preamplifier * 2012 Factory Upgraded * Walnut Case * Box | The Turntable Store