Luxman M-7F
Here is a case where the archive has to be honest about a gap in the record. The designation "M-7F" does not appear anywhere in the available research. What is documented is the closely related Luxman M-7 (released 1971) and its M-7D variant (released 1973). Whether the M-7F is a distinct, undocumented model or a typo for one of these is not something the sources can settle. What follows applies to the M-7/M-7D; treat it as context for the M-7F rather than confirmed specification.
The M-7 was a solid-state class AB power amplifier delivering 60 watts per channel into 8 ohms, with 100 watts available into 4 ohms. Signal-to-noise was rated at 93 dB, damping factor at 40, and total harmonic distortion at 0.05% or 0.1% depending on the source — figures that placed it comfortably in serious high-fidelity territory for the early Seventies. Frequency response is listed variously as 20 Hz to 20 kHz and, more ambitiously, 5 Hz to 50 kHz depending on the source; the discrepancy is unresolved. HiFI-Stereo (1982, p.79) covered tuner specifications in the same era, so no direct period review of this amplifier surfaced in the research.
Beyond those basics, the record is thin. No dimensions, weight, original price, or circuit-level detail has been found. If you own an M-7F and can confirm whether it matches the M-7's specifications, the archive would welcome the correction.
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