ADC 660-XE
Little is documented about the ADC 660-XE. What survives is a single listing in a pair of period equipment directories from 1972, where it appeared among the phono cartridges. No advertising, reviews or service literature have turned up beyond those entries.
The directory listings give the 660-XE an elliptical stylus (0.3 × 0.7 mil) and a recommended tracking force of 2 grams. The tracking angle was 15°. Frequency response was rated at 10-20,000 Hz within ±2.0 dB, and channel separation was nominally 20 dB from 50 to 12,000 Hz, as reported in Audio-Collection (1972, p.36) and HiFI-Stereo (1972, p.34). The same directories also listed an ADC model with a 0.7 mil spherical stylus and 1-3 gram tracking force in the same table. It is unclear whether that data referred to the 660-XE or a different variant.
No production years, original price or packaging information have been found. The 660-XE appears to have been a brief entry in ADC's early-1970s phono cartridge lineup, likely a step above the company's spherical-tip models. The documentary record is too thin to confirm its exact place in the range.
Known Specifications (from period directories)
- Stylus: 0.3 × 0.7 mil elliptical
- Tracking force: 2 g (recommended)
- Tracking angle: 15°
- Frequency response: 10–20,000 Hz, ±2.0 dB
- Channel separation: nominally 20 dB (50–12,000 Hz)
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