Mark Levinson ML-7 (circa 1977)
The ML-7 is a Mark Levinson model where the surviving record is thinner than the reputation. It was a FET-based preamplifier. One source ties a "Design Philosophy" document for the unit to roughly 1977. It was still being introduced to dealers as late as June 1985, when Audio (September 1985, p.5) ran a full-page announcement calling it "The new ML-7 Preamplifier." That is a long run, and it suggests the design had real staying power in the line. Exactly when production began and ended isn't documented.
The spec sheet shows a flexible phono stage for serious vinyl. The ML-7 had separate gain and loading for moving coil and moving magnet cartridges. MC input sensitivity was 0.5 mV with 100-ohm loading, MM was 1.5 mV with 47 kohms, and there was a 150 mV line input. Gain stepped from 60 dB (MC) down to 40 dB (MM) and 20 dB for line. Frequency response was rated at 20 Hz to 20 kHz ±0.25 dB, with THD at 0.05%. Signal-to-noise was respectable for the era: 73 dB on MC, 78 dB on MM, and 90 dB on line. Output impedance was a low 75 ohms, which suggests it was designed to drive long interconnects without rolling off the top end.
Period ads place the ML-7 at a transition point for the company. An Audio piece from November 1980 (p.114) noted that the "new technology of the ML-7" would gradually supplant the earlier ML-1 preamplifier, a purist, slim-line design with no tone controls or meters. So the ML-7 appears to have been the successor to that model, bringing FET circuitry into the slot the ML-1 had occupied.
Beyond that, the record goes quiet. No original price, dimensions, or weight have surfaced in the research, and no owner impressions or restoration notes are documented. If you own one, you're holding a piece of Mark Levinson's transitional period — a FET preamp that bridged the company's early purist designs and the heavier, dual-mono monuments that followed in the 1980s.
- FET preamplifier, "Design Philosophy" document circa 1977
- Frequency response: 20 Hz – 20 kHz ±0.25 dB
- Input sensitivity: 0.5 mV (MC), 1.5 mV (MM), 150 mV (line)
- Input impedance: 100 ohms (MC), 47 kohms (MM), 25 kohms (line)
- Gain: 60 dB (MC), 40 dB (MM), 20 dB (line)
- S/N ratio: 73 dB (MC), 78 dB (MM), 90 dB (line)
- THD: 0.05%
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