Audio Research SP-4
Stereo Pre Amplifier (1977)
The SP-4 preamplifier was designed around the Analog Module which acts as a 'super tube' because it takes the best qualities we see in the vacuum tube much closer to the theoretical ideal.
The SP-4 surpasses our vacuum tube preamplifier in the most important areas. It has increased musical depth and definition with a smoothness that will satisfy any vacuum tube enthusiast.
Frequency response: 5Hz to 100kHz
Total harmonic distortion: 0.005%
Gain: 36dB (MM), 24dB (line)
Signal to noise ratio: 84dB (MM), 95dB (line)
Output: 2V (Pre out), 10V (Pre out Max)
Dimensions: 480 x 210 x 89mm
Accessories: walnut veneered oiled finish cabinet
Price: USD $895 (1976)
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