Quad AMII FM Tuner (1973–1978)
The Quad AMII is an FM-only tuner introduced in 1973 as part of Quad's second-generation line of audio separates. It was built for signal accuracy, low distortion and good stereo decoding. It has a 'tilt' front panel and a phase-locked loop (PLL) stereo decoder, and vintage tuner fans still respect it.
Specifications
| Feature | Specification |
| Year of Production | 1973–1978 |
| Type | FM-only tuner |
| Power Output | N/A (no amplification stage) |
| Aerial Input Impedance | 75 ohms |
| Output Impedance | 600 ohms |
| Sensitivity (Mono) | 2.5 μV for 40 dB S/N ratio |
| Sensitivity (Stereo) | 50 μV for 40 dB S/N ratio |
| Stereo Decoder | Phase-locked loop (PLL) |
| Bandwidth Filters | Switchable (wide/narrow) |
| Tuning Display | Center-of-channel and signal strength meters |
| Front Panel Design | Proprietary 'tilt' angled design |
| Dimensions | 435 mm (W) × 120 mm (H) × 320 mm (D) |
| Weight | 9.5 kg |
Key Features
- FM-Only Tuner: Focused exclusively on FM band reception, allowing for optimized circuitry and performance.
- PLL Stereo Decoder: Advanced phase-locked loop system for stable stereo demodulation with excellent channel separation and reduced crosstalk.
- Switched Bandwidth Filters: Selectable wide/narrow IF bandwidth for optimizing reception in strong or weak signal areas.
- Dual Metering System: Integrated signal strength and center-of-channel meters for precise tuning.
- Tilt Front Panel: Unique ergonomic design that angles controls and meters toward the user, enhancing usability and visual appeal.
- Low Distortion Design: Engineered for minimal harmonic and intermodulation distortion, preserving signal integrity.
Historical Context
Quad, Revox and Harman Kardon were all pushing tuner performance when the AMII appeared. It sat alongside amplifiers like the 405 and preamps like the PAII in Quad's second-generation separates, and it followed the company's philosophy of "the closest approach to the original sound."
Many tuners of the era gave up performance for convenience. The AMII didn't. Its PLL decoder was ahead of its time and was more stable than the more common Foster-Seeley discriminators. The tuner was praised for a clean, neutral sound, excellent noise rejection and precise stereo imaging.
The AMII was often paired with other Quad components in high-end systems, particularly in the UK and Europe, where FM broadcasting quality was rapidly improving in the 1970s. Its build quality and circuit design fit Quad's reputation for long-lasting, sonically transparent equipment.
Sound Signature
The AMII sounds neutral, clean, and highly detailed, with minimal coloration. The PLL decoder gives tight stereo separation and consistent channel balance, even when the signal is marginal. Users often note how it pulls subtle details out of broadcasts while keeping a quiet noise floor. Low distortion and accurate frequency response make it a favorite for critical listening and classical music.
Maintenance and Restoration Tips
The AMII is well built, but age-related problems are common. Proper maintenance can bring it back to excellent working condition:
- Capacitor Replacement: Electrolytic capacitors in the power supply and stereo decoder section degrade over time. A full recap is recommended, especially if the unit has been stored or unused for years.
- Meter Bulb Replacement: The center-of-channel and signal strength meters use small incandescent bulbs that may burn out. Replace with correct voltage (typically 6.3V) miniature lamps.
- Cleaning Controls: Use contact cleaner on tuning and filter switches to eliminate crackling or intermittent operation.
- Alignment Check: Over decades, coil slugs and oscillator alignment may drift. A professional alignment ensures optimal sensitivity and selectivity.
- Antenna Connection: Ensure a proper 75-ohm FM antenna is used for best performance. A mismatched antenna can reduce sensitivity and increase noise.
Collectibility and Market Value
The Quad AMII holds steady appeal among vintage audio collectors, particularly those focused on British hi-fi. Its collectibility rating is 7/10, based on its engineering pedigree, unique design and strong performance for its era.
- Market Value: $200–$400 USD, depending on condition, originality, and functionality.
- High-Value Units: Fully serviced models with working meters and original finish command premium prices.
- Restoration Potential: Units in non-working condition can be excellent restoration projects due to the availability of service documentation and community support.
Conclusion
The AMII is 1970s British audio engineering: focused, precise and uncompromising. It has no digital tuning and no AM reception. Its FM performance, build quality and design make it a worthy addition to a vintage hi-fi system.
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Related Models
- Quad fmii (1970)
- Quad am3 (1971)
- Quad hr1 (1978)
- Quad fm3 (1975)
- Quad FM4 (1982–1988)
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- Kenwood KR 4070 (1977-1979)
- Kenwood KR 4200 (1975-1977)
- Marantz 1515 (1976-1978)