For your consideration, we have the completely passive Mod Squad Line Drive System Control Center Preamplifier. With no introduction of AC power to the unit, there is no introduction of power noise of any type. This classic unit has five line inputs, and jacks for a tape deck. The Line Drive was acquired from the original owner, and it is in perfect working order. There are some light scratches and blemishes, but no deep scratches or dents. The preamp presents itself very well. See pictures for further details.
From an excerpt from a Sterophile review from April 1987 (John Atkinson, Anthony H. Cordesman):
This unitI allows the audiophile to replace a preamp, with its active gain stages—and resulting coloration—with a device that introduces no distortion or coloration other than that in the wiring, switches, and controls.
We don't have the original box for this unit, but we take packaging and shipping seriously. We spare no expense and use heavy duty boxes, several inches of polyethylene foam on all sides of the unit. Finally, water activated, fiber reinforced tape is used on all seams.