Accuphase E-406V (1996)
High-end integrated stereo amplifier with discrete current feedback design and modular expansion options.
Overview
The Accuphase E-406V is an integrated stereo amplifier released in December 1996. Developed as a new reference model for integrated amplifiers, it incorporates technology from Accuphase’s separate preamp and power amp designs. It delivers 170W/ch into 8 Ω and 220W/ch into 4 Ω, with a total harmonic distortion of just 0.02% across 4 Ω to 16 Ω loads. The amplifier features independent preamp and power amp sections, allowing use as a standalone power amplifier via dedicated input/output terminals.
Specifications
| Power Output (8 Ω) | 170W/ch (20 Hz – 20 kHz, both channels driven) |
| Power Output (4 Ω) | 220W/ch (20 Hz – 20 kHz, both channels driven) |
| THD | 0.02% (4 Ω – 16 Ω load, both channels driven) |
| Frequency Response | 20 Hz – 20 kHz ±0, -0.2 dB (rated output); 2 Hz – 150 kHz ±0, -3.0 dB (1W output, main amp) |
| Damping Factor | 120 (8 Ω, 50 Hz) |
| Inputs | 8 total, including 2 balanced inputs |
| Speaker Outputs | 2 sets of solid brass machined terminals |
| Dimensions | 475 mm W × 180 mm H × 423 mm D |
| Weight | 23 kg |
| Power Supply | 100 VAC, 50/60 Hz |
| Power Consumption | 55W (idle), 585W (8 Ω rated output) |
| Remote Control | RC-20 (infrared, 2× AA batteries) |
Design
The E-406V uses a current feedback amplifier circuit without phase rotation in both the power and line amplifier stages. The power amplifier output stage employs a triple parallel push-pull configuration with high-output audio transistors. The preamp section uses a discrete, pure complementary push-pull circuit with a cascoded A-class stage. Tone control uses an additive active filter design found in professional graphic equalizers. The preamp and power amp sections are physically separated and include a switch to use the unit as a standalone power amplifier. Two rear-panel slots support optional AAB-standard boards, including the AD-10 analog disc input board (MM: 29dB gain, 47kΩ; MC: 60dB gain, selectable 10/30/100Ω). The power supply uses a high-efficiency toroidal transformer isolated by section, and signal routing uses sealed communication-grade relays with gold-plated contacts. Large analog power meters feature logarithmic compression and peak hold.
Context
The E-406V was positioned by Accuphase as a reference integrated amplifier, combining the performance of separate components into a single chassis using advanced circuit topologies developed in their high-end separates.
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