$12,000.00
Audio Research Classic 150s with Audio Research SP-15 Pre-Amp
The Audio Research Classic 150 is a monaural hybrid power amplifier delivering 140-150 watts RMS into 2, 4, or 8 ohms. It combines FET input stages with eight (8) 6550 power tubes running in triode mode, utilizing a massive, 2-speed fan-cooled chassis. Designed with a 20dB gain and high current capability, it is known for producing a “melodious” midrange.
Audio Research SP-15 Pre-Amp with SP-15 Power Supply
The Audio Research SP-15 is from the late 80s with an external power supply. It combines a tube-driven phono stage (3 x 6DJ8/6922) with a solid-state line stage to deliver a smooth, quiet, and detailed sound that bridges the gap between traditional tube warmth and modern SS transparency.
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Description
Audio Research Classic 150 Amps
- Power Output: 140 Watts minimum continuous at 8 ohms (10Hz-20kHz).
- Approximate Power at Clipping: 150 Watts (1kHz).
- Tube Complement: (8) 6550 power tubes (matched pairs).
- Frequency Response: 7Hz to 100kHz (-3dB points).
- Input Sensitivity: 0.6V RMS for rated output.
- Input Impedance: 60K ohms nominal.
- Damping Factor: Approximately 30.
- Output Regulation: ~0.3dB (8 ohm load to open circuit).
- Dimensions: 19″ (48 cm) W x 10.5″ (27 cm) H x 16″ (41 cm) D.
- Weight: 110 lbs (50 kg) net
Audio Research SP15 Pre-Amp
- Frequency response: 0.2Hz to 100kHz
- Total harmonic distortion: 0.005%
- Gain: 75dB (MM), 29dB (line)
- Signal to noise ratio: 76dB (MM), 110dB (line)
- Output: 2V (Pre out), 80V (Pre out Max)
- Valve complement: 3 x 6DJ8/ECC88
- Dimensions: 480 x 134 x 260mm
- Weight: 6.4kg
- Year: 1988
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