This preamp has a unique function which allows it to work as a hybrid 2 channel / 5 channel preamp. When used with multichannel sources the various speaker levels can be trimmed in the setup menu. When listening to 2 channel sources this feature is bypassed and L/R audio levels are always identical unless the balance is adjusted. This setup could still be taken advantage of today with a high-end 4K Blu-ray disc player that offers multichannel analog output. In great working and cosmetic condition. Fully tested in our lab where it performed admirably. Your purchase includes the original box and remote, plus a power cord. * Please note this is a line stage preamp only, as the optional McCormak phono stage was not selected by the original owner. You can however easily connect a separate high-grade external phono stage like this tube based Pro-Ject model on our site. Click below to add our recommended matching cables from Kimber Kable, all brand new as SkyFi is an official Kimber dealer. Kimber Kable - RCA Interconnects Kimber Kable - Power Cords SPECIFICATIONSLine Amplifier Section Gain: 20 dBBandwidth: 0.5 Hz - 300 kHz +0,-3dBMaximum Output: 3v rmsTHD: Less than 0.1 % at 1.0v rms outHum and Noise: 100 dB below 2.5v rms out Signal Polarity ("Absolute Phase"): Non-inverting Output Impedance: Less than 100 ohmsInput Impedance: 13.5 kohmsFuse:120 volt ac line: 200 ma 5 x 20 mm "t" typeMechanicalDimensions: 19" W, 3.5" H, 11.25" DWeight: 18 lbs. McCormack MAP-1 Analog Multi-Channel Preamplifier The SkyFi Testing Process for Preamplifiers:We start with a visual inspection of all internal components to make sure there are no signs of stress or aging. Capacitors are checked for telltale sings of bulging or leaking, resistors are checked for signs of overheating or cracking, and transistors are checked for signs of stress or damage. Special attention is paid to the power supply which is the most common source of failure for preamps. We then power up the unit and run a simple 1k sine wave while monitoring the low voltage output on an oscilloscope for signs of distortion or noise to get a baseline. At this point we will lubricate and clean all switches and potentiometers (that are not sealed) with a high quality contact cleaner, and then re-test all functions for any signs of noise or scratching. Final testing involves putting actual music through the preamplifier. We have learned over time that some issues are only noticeable to a trained ear while listening to a familiar source material. Our test bench has reference vintage KEF speakers that we are super familiar with which will quickly reveal any discrepancies. Some preamps will then move into the listening room where they will be tested with our in-house reference system. Item Included Original Box Yes Manual Online Only Remote Yes Cables Yes - Power Only Physical Condition 8 Working Condition 10
