Sony ECR-500
Little is documented about the Sony ECR-500. The archive holds no confirmed spec sheet, no manual, and no production dates for this model. A search of period sources turned up only OCR fragments, and none of them name the ECR-500. So even the most promising lead has to be labeled unconfirmed.
The one fragment that may concern this model appeared under a Sony identification block in High Fidelity (1980, p.198). It reads like a product spec listing, not a review. It describes an electrostatic headphone with electret diaphragms, where the polarizing voltage is permanently frozen in. That means no AC line connection is needed. The figures listed are 110 dB SPL sensitivity at 0.20 mV input, 100 ohm impedance, 0.5% THD at 110 dB SPL, and 0.1 watt rms maximum per channel. These could well be ECR-500 specs, but the surviving text doesn't say so outright.
Other fragments pulled for this model are clearly unrelated. One discusses a Garrard turntable, another studio wiring. They add nothing. If you own an ECR-500 or have original literature, the archive would welcome the record.
Unconfirmed specs from the period fragment:
- Electrostatic headphone, electret diaphragms, no AC polarization supply
- Sensitivity: 110 dB SPL at 0.20 mV input
- Impedance: 100 ohms
- THD: 0.5% at 110 dB SPL
- Max power: 0.1 W rms per channel
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