ADC 990-XE
Little is documented about the ADC 990-XE beyond a few period cartridge listings. What the record shows is a phono cartridge with an elliptical stylus, positioned in ADC's early-1970s lineup. Listed frequency response is 10-20,000 Hz at 12.0 dB. The stylus is a 0.3 × 0.7 mil elliptical, tracked at 2 g, with a 15° tracking angle and nominal channel separation of 22 dB. A High-Fidelity article (February 1971, p.46) discusses high-frequency groove forces and tracking dynamics. It doesn't name the 990-XE directly, but it appeared in the same context as ADC's cartridge engineering of the period, which suggests the model reflected the company's attention to stylus-tip mass and contact integrity at high frequencies.
No original price, production years, or packaging details have surfaced in the surviving record. The 990-XE seems to have been a standard elliptical offering from ADC in the early '70s. Where exactly it sat in the line, and how long it stayed available, remains unclear.
- Type: Phono cartridge
- Stylus: 0.3 × 0.7 mil elliptical
- Tracking force: 2 g
- 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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