Denon DL-103D
The DL-103D is a moving-coil phono cartridge. It is the third-generation refinement of Denon's long-running broadcast-reference DL-103 series. HiFI-Stereo (September 1978, p.45) noted that Denon had been building and refining moving-coil cartridges since 1950, and that they served as a reference standard for the Japanese broadcasting industry. The 103D was described as the next step in that line, with higher compliance, lighter mass, and a modified super-polished elliptical stylus.
Audio (September 1980, p.74) measured the DL-103D alongside the DA-307 tonearm and AU-320 step-up transformer. The published figures: output of 0.25 mV at 1 kHz (50 mm/s horizontal), internal impedance of 33 ohms ±20%, channel separation over 28 dB at 1 kHz, channel sensitivity difference of 1 dB or less, weight of 7.5 grams, recommended load of 100 ohms or more, and a rated frequency response of 10 Hz to 100 kHz ±1 dB. Those are standard low-output moving-coil numbers, and the AU-320 step-up makes sense, since a 0.25 mV cartridge needs one. The listening panel, working through the DA-307 arm, reported no real adverse comments regarding timbre or spatial positioning on small-ensemble and single-instrument recordings (Audio, September 1980, p.78).
Formal documentation on the DL-103D is otherwise thin. Production years and original pricing are not confirmed in the record.
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