Yamaha Natural Sound Stereo Amplifier CA-2000

Model

CA-2000

Brand

Yamaha

Here’s a profile on the Yamaha Natural Sound Stereo Amplifier CA-2000, plus what to watch out for if you own or are acquiring one: --- Overview & Context The CA-2000 is an integrated stereo amplifier made by Yamaha in the late 1970s (circa 1977–1979) In some markets, the counterpart (or later version) is called the CA-2010. It was part of Yamaha’s “Natural Sound” line, aiming for high fidelity with minimal coloration. --- Technical Specifications & Features Here are the key specs and features: Spec Value / Behavior Power Output 120 W + 120 W into 8 Ω (Class B) Alternate Mode 30 W + 30 W into 8 Ω (Class A mode) Distortion / THD Around 0.03% typical in the rated operating range Frequency Response Wide band: e.g. for tuner/pre out, 5 Hz – 100 kHz (–1 dB) Tone Controls / Filters ±10 dB for bass (with selectable turnover — 125 Hz or 500 Hz) and treble (2.5 kHz or 8 kHz), with ability to defeat (bypass) tone controls Input Sensitivities & Impedances • Phono MM: 2 mV / 47 kΩ / 68 kΩ / 100 kΩ <br> • Phono MC: 50 µV / 10 Ω <br> • Tuner / Aux: 120 mV / 50 kΩ Outputs / Pre / Rec Rec out: 120 mV / 600 Ω <br> Pre out: 1 V / 500 Ω Power Supply / Consumption For Japanese model: 100 V, ~300 W rated consumption <br> For other (export) versions, power specs differ (e.g. higher consumption) Physical Dimensions: 461 × 170 × 360 mm (W × H × D) <br> Weight: ~20 kg (≈ 44 lb) Features • Switchable Class A / Class B <br> • Subsonic and high-frequency filters <br> • Mute / audio muting <br> • Ability to bypass tone control (Direct / Line / Straight mode) <br> • Multiple inputs: 2 phono, tuner, aux, 2 tape, pre-in <br> • Outputs: 2 speaker sets, pre-out, rec-out, headphone <br> • Durable build: internally, circuitry designed to minimize signal degradation (e.g. FET differential inputs, current mirror stages) --- Strengths & Appeal Versatility & sophistication: The ability to switch between Class A (for lower distortion, though lower power) and Class B gives flexibility depending on listening conditions and speaker efficiency. High build quality: Yamaha used strong circuit design (e.g. low-noise FETs, minimizing coupling capacitors, careful feedback loops) to preserve signal integrity. Musical / “natural” character: Many aficionados praise its tonal balance, clarity, and finesse rather than raw power. Good filtration & control options: The filters (subsonic & high) can help clean up extremes (e.g. turntable rumble, vinyl crackle) without interfering in normal use. Longevity (if maintained well): Many units still in use decades later, though age-related issues (e.g. leaky capacitors, drift, contact wear) are likely.