Marantz 510MR
The Marantz 510MR is a digital-display tuner covering FM, MW, and LW bands. It is one of those late-1970s Marantz models that shows up in database records and little else. No production years, original price, or market context are documented in the available sources. The specifications are solid and unremarkable, about what you'd expect from a mid-level tuner of its era.
The specs appear consistently across the Hifi Engine database and the hifi-wiki summary of the user manual. The FM section has 1.5 µV sensitivity, 75 dB signal-to-noise ratio, 0.15% harmonic distortion, and 45 dB stereo separation. Selectivity is listed at 60 dB. MW and LW bands have looser figures - 250 µV and 500 µV sensitivity respectively, and 0.4% distortion. Fixed output is 0.5 V, and the variable output also tops out at 0.5 V. Power consumption is a modest 14 watts.
It's a standard-width component: 416 × 88 × 269 mm and 4.2 kg, with a brushed aluminum faceplate and metal chassis. The digital tuning display is the notable design feature. The sources don't say whether the tuning system is frequency-synthesized or a digital readout over analog tuning, so that question stays open.
The only period reference found is a classified ad rather than a review. Audio (April 1979, p.107) lists a 510MR among Marantz and McIntosh gear wanted for trade, which confirms the model was in circulation by early 1979. No owner reviews, repair notes, or current market values are recorded.
Known specifications
- Bands: FM, MW, LW
- FM sensitivity: 1.5 µV (32.5 dBf)
- FM S/N ratio: 75 dB
- FM harmonic distortion: 0.15%
- FM selectivity: 60 dB
- Stereo separation: 45 dB
- Frequency response (FM): 30 Hz – 15 kHz
- Output: 0.5 V fixed / 0–0.5 V variable
- Power consumption: 14 W
- Dimensions: 416 × 88 × 269 mm
- Weight: 4.2 kg
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