ADC 550-XE
Little is documented about the ADC 550-XE. The model name appears in no period advertisements, brochures, or dealer listings among the ADC records that survive. A set of specifications in a 1972 phono cartridge roundup in HiFI-Stereo (1972, p.36) may point to the 550-XE, though the listing does not name the model. That entry describes a cartridge with a frequency response of 10-20,000 Hz at ±2.0 dB, a 0.3 × 0.7 mil elliptical stylus, a tracking force of 2 grams, a 15° tracking angle, channel separation nominally 20 dB from 50-12,000 Hz, and compliance of 18 × 10⁻⁶ cm/dyne. These figures could well belong to the 550-XE. Without a firm name match or product photos, the attribution stays uncertain.
Nobody has documented where the model sat in the ADC cartridge lineup, above or below the well-documented XLM and QLM series. Its production years are not documented either. Collectors who find a 550-XE will be working from the same thin record.
Unconfirmed specs possibly associated with the ADC 550-XE:
- Frequency response: 10–20,000 Hz ±2.0 dB
- Stylus: 0.3 × 0.7 mil elliptical
- Tracking force: 2 g
- Tracking angle: 15°
- Channel separation: nominally 20 dB (50–12,000 Hz)
- Compliance: 18 × 10⁻⁶ cm/dyne
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