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AUDIO RESEARCH SP-3

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Technic details

Specifications

Type:
Tube Stereo Pre Amplifier
Frequency response:
15Hz to 30kHz, ±1dB
Harmonic distortion:
Less than 0.005% at 5V RMS output
IM distortion:
Less than 0.005% at 5V RMS output
S / N ratio:
High-level inputs: More than 90dB below rated output (Unweighted wide-band)
Magnetic phono inputs: More than 70dB below rated outputs (Below 10mV input, 20Hz to 20kHz)
Power line components (Hum):
More than 66dB
Gain:
57dB (Magnetic phono input, main outputs, IHF load)
34dB (Magnetic phono input, tape outputs, IHF load)
23dB (High level inputs, main outputs, IHF load)
0dB (High level input, tape outputs, IHF load)
[Input impedance]
Magnetic Phono: 50KΩ (150pf shunt)
High-level: 100kΩ
Output impedance:
Less than 600Ω @ 1kHz (All outputs)
Recommended load:
20kΩ or greater
Maximum inputs:
300mV RMS @ 1kHz (Magnetic phono input)
High-level inputs overload proof
Maximum output:
25V RMS @ 1kHz, all outputs
Tube complement:
8 x 12AX7
[Tone controls]
Bass: ±18dB at 10Hz
Treble ±18dB at 15kHz
AC Outlets:
4 x Switched (1000W Max.)
2 x Unswitched
Power requirements:
AC 120 / 240V, 50 / 60Hz
Power consumption:
60W
Dimensions (W x H x D):
397 x 127 x 305mm
Weight:
9.7kg
Year:
1972

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