Onkyo T-4700 (c. 1990)
The T-4700 is an FM/AM tuner from Onkyo's early-1990s line. Not much is documented about it. It survives mostly through a single Equipment Profile in Audio (June 1990, p.108), plus a couple of follow-on pages in the same issue. No production years, original price, or owner history seem to be recorded anywhere else, so everything below comes from that review.
The Audio profile concentrated on two things. The first was Onkyo's four-mode APR system, short for Automatic Precision Reception. It constantly monitors signal quality and automatically picks the best settings for stereo/mono, high blend, wide or narrow i.f. response, and local/distant reception. The second was the preset scheme. The user could categorize and access preset stations by program type, or by the name of the family member who listens to them.
Measured results from the same review were respectable. FM usable sensitivity was 10.3 dBf mono and 17.2 dBf stereo. Ultimate S/N reached 83 dB in mono and 78.5 dB in stereo. Stereo separation held at 46.5 dB at 100 Hz and 41.3 dB at 10 kHz. The reviewer reported pulling in 46 stations, 40 of them acceptably noise-free in stereo.
Known specs, as listed in the manufacturer's specifications printed with the Audio review:
- FM usable sensitivity: mono 10.3 dBf; stereo 17.2 dBf
- AM usable sensitivity: 25 µV; S/N 40 dB; THD 0.7%
- AM output voltage: 0 to 300 mV
- APR automatic reception with stereo/mono, high blend, i.f. width, and local/distant selection
- Presets assignable by program type or listener name
Beyond that June 1990 review, little else is documented about the T-4700. It appears to have been one of Onkyo's more feature-conscious tuners of the period.
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