Accuphase T-1000 (2005)
FM stereo tuner released in August 2005 with advanced digital synthesis and DSP-based demodulation.
Overview
The Accuphase T-1000 is an FM stereo tuner developed by Accuphase Laboratory, Inc., combining high-frequency engineering with digital technology. Released in August 2005, it features a DDS (Direct Digital Synthesis) synthesizer system for precise tuning and includes 32 station memories that store and recall all function settings. The tuner was designed for high signal handling, using a double-tuned antenna circuit and an attenuator at the input gate to manage strong RF inputs. It includes both balanced (XLR) and unbalanced (RCA) analog outputs, plus a coaxial digital output, and ships with the RC-33 remote commander.
Specifications
| Product Type | FM stereo tuner |
| Release Date | August 2005 |
| Original Price | ¥280,000 |
| Weight | 11.8kg |
| Dimensions (W×H×D) | 465 × 140 × 402 mm |
| Power Consumption | 17W |
| Power Supply | 100 VAC, 50/60Hz |
| Tuning Range | 87.5–108 MHz |
| Preset Memory | 32 stations |
| Antenna Input | 75 Ω unbalanced (F-type) |
| Output Impedance (Balanced) | 200 Ω (XLR) |
| Output Impedance (Unbalanced) | 200 Ω (RCA) |
| Digital Output | Coaxial, 0.5Vp-p/75Ω, 48kHz sampling |
| Output Voltage | 1.0V (±75 kHz deviation) |
| Standing-Wave Ratio | 1.5 |
| Capture Ratio | 1.5dB |
| Image Ratio | 100dB |
| Spurious Interference Ratio | 120dB |
| RF Intermodulation | 80dB |
| AM Suppression Ratio (65 dBf) | 80dB |
| Subcarrier Suppression Ratio | 70dB |
| Practical Sensitivity | 11dBf (IHF) |
| S/N 50 dB Sensitivity | 17dBf (IHF) |
| S/N (80 dBf, A-corrected) | 90dB |
| THD (20Hz–10kHz) | 0.02% |
| IM Distortion | 0.01% |
| Frequency Response | 10 Hz – 15,000 Hz (+0, -2.0 dB) |
| Stereo S/N (80 dBf, A-corrected) | 85dB |
| Stereo THD (20Hz–10kHz) | 0.04% |
| Stereo IM Distortion | 0.03% |
| Stereo Separation | 100Hz: 50dB, 1kHz: 50dB, 10kHz: 40dB |
| Stereo S/N 50 dB Sensitivity | 37dBf (IHF) |
| Two-Signal Selectivity (IHF) | 400kHz: 70dB, 300kHz: 30dB, 200kHz: 10dB |
Design
The T-1000 uses a dual-stage tuning front end with a double-tuned antenna circuit and cascode FET amplification to handle high signal levels without cross-modulation. Its local oscillator is based on DDS rather than a phase-lock loop, enabling precise frequency control and the FREQ. TRIM function, adjustable in 10 Hz steps. The detection system uses Accuphase’s Advanced DGL (Differential Gain Linear) circuit, while stereo demodulation is handled by the DS-DC (Direct Synthesis-Double Cancellation) system, both implemented via DSP. The design includes a pulse tuning method for manual adjustment, balanced and unbalanced outputs, and front-panel switches for Filter, Mute, and Mono. An electronic beep confirms knob and button operation.
Context
Described as a top-of-the-line FM stereo tuner, the T-1000 represented the culmination of Accuphase’s digital tuner development at its release, succeeding earlier models like the T-107 in performance reputation.
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