MBL 4004 Preamp with Remote - Super Rare!

Designed and made in Germany by legendary speaker maker MBL.

Gorgeous construction throughout utilizing thick plexiglass, brass knobs, and extremely high component quality. 

Expandable with optical cards available directly from MBL.

Includes a basic remote with motorized volume control.

Specifications:
RCA Single Ended Inputs:
Tape, DAT, Tuner, and CD

RCA Single Ended Outputs:
Tape, DAT, Output 1, Output 2

XLR Balanced Outputs:
One Set - Left and Right

Weight:
17.63 lbs.  (8 kg)

Dimensions (W x D x H):
17.91" x 11.42" x 3.74"  (45.5 x 29 x 9.5 cm)

Power:
110 VAC, 50/60 Hz

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.