Accuphase E-406V
¥ 380,000 (released in December 1996)
Commentary
This is an integrated amplifier developed as a new reference model of integrated amplifier by Accuphase using the technology developed in the development of separate amplifier.
The output element of the power amplifier section uses a power transistor for high-output audio that has excellent high-frequency characteristics, linearity of current amplification factor, switching, and other characteristics.
Since this element is composed of 3-parallel push-pull, stable operation against load fluctuation is realized, and excellent power in reactance component and low-impedance load driving capability is demonstrated.
A current feedback amplifier circuit without phase rotation is used for the power amplifier and line amplifier.
In this circuit, the impedance of the input terminal on the feedback side is lowered to detect a current, and the current is converted into I-V (current-voltage) by a transimpedance amplifier to produce an output signal. Therefore, since the impedance of the feedback input part is low, phase rotation hardly occurs and phase compensation is hardly necessary.
As a result, various characteristics can be greatly improved with a small amount of NFB, and dynamic characteristics such as start-up are excellent and natural energy response is realized.
The line amplifier section uses a pure complimentary service push-pull circuit with a cascoded A-class amplifier stage and consists of discrete parts using a current feedback amplifier circuit.
This reduces the amount of phase compensation for each stage, resulting in more natural sound quality.
The tone control section is equipped with an additive active filter tone control used in full-fledged graphic equalizers.
In this method, the original flat signal passes straight through, and characteristics are controlled by making another characteristic as necessary and adjusting it from the flat signal.
In order to configure the shortest and straight signal path, a logic relay control method is adopted.
The relay used is a sealed relay for the communication industry. The contact is gold-plated and crossbar twin system, and low contact resistance and high durability are realized.
The power supply section uses a high-efficiency toroidal power transformer independent of the power amplifier / preamp section to prevent mutual interference between amplifiers.
Toroidal transformers have a structure in which thick copper wires are wound around a doughnut-shaped core, so they are characterized by low impedance, small size and high conversion efficiency. In addition, the toroidal transformer used in the E-406V has an iron core with a circular cross-section and a coil with a circular shape and good adhesion. Therefore, loss is small, weight is light, and leakage flux during load is small. In addition, iron loss and inrush current are reduced by making the iron core with a small cross-section and increasing the weight ratio of copper wires.
The speaker terminals are made of solid brass machined large terminals that can be used with very thick speaker cables, can be used by switching between two systems, and can be used for by-wire connection.
Equipped with a large power meter to monitor output power.
Since this meter is logarithmic compression type, you can see a wide dynamic range at one time.
Eight input selector side systems and two tape recorder systems can be input. In addition, two balance input systems are installed.
The preamp section and power amplifier section are separated, and a changeover switch for use as an independent amplifier and its input / output terminals are mounted.
There are two slots on the rear panel for easy insertion of option boards, and option boards corresponding to the AAB interface standard can be added.
.JPG)
.JPG)
.JPG)
.JPG)
.JPG)
.JPG)
Model Rating
| Type | Integrated stereo amplifier | |||||||||||||||||
| Rated continuous average power (both channel operation, 20 Hz to 20 kHz) |
220W/ch (4 Ω) 170W/ch (8 Ω) |
|||||||||||||||||
| Total harmonic distortion factor (both channel operation) | 0.02% (4 Ω ~ 16 Ω Load) | |||||||||||||||||
| IM distortion factor | 0.01% | |||||||||||||||||
| Frequency characteristic |
|
|||||||||||||||||
| Damping factor | 120 (8 Ω load, 50 Hz) | |||||||||||||||||
| Input Sensitivity / Impedance (Rated Output / EIA1W Output) |
High Level input : 147mV/11.2mV/20k Ω Balanced input : 147mV/11.2mV/40k Ω Main input : 1.47V/112mV/20k Ω |
|||||||||||||||||
| Rated Output / Impedance | Pre output : 1.47V/50 Ω (at rated continuous average output) | |||||||||||||||||
| Gain | Main input → output : 28 db High Level input → Pre output : 20 dB |
|||||||||||||||||
| S/N, input conversion noise |
|
|||||||||||||||||
| Tone control | Bass (300 Hz) + / - 10 dB (50 Hz) High tone (3 kHz) : ± 10 dB (20 kHz) |
|||||||||||||||||
| Loudness compensator | + 6 dB (100 Hz, Volume -30dB) | |||||||||||||||||
| Power meter | Logarithmic compression type peak level display Direct reading of output at dB scale and 8 Ω load |
|||||||||||||||||
| Load impedance | 4 Ω ~ 16 Ω | |||||||||||||||||
| Headphone port | Applicable Impedance : 4 Ω ~ 100 Ω | |||||||||||||||||
| Pwer | 100 VAC, 50Hz/60Hz | |||||||||||||||||
| Power consumption | 55W (non-input) 350W (Electrical Appliance and Material Control Law) 585W (at 8 Ω load rated output) |
|||||||||||||||||
| Maximum external dimensions | Width 475x Height 180x Depth 423 mm | |||||||||||||||||
| Weight | 23kg | |||||||||||||||||
| Attachment : Remote Commander RC-20 | ||||||||||||||||||
| Remote control system | Infrared pulse system | |||||||||||||||||
| Pwer | DC 3V | |||||||||||||||||
| Dry battery | AA Type (SUM-3/R6), 2 pcs | |||||||||||||||||
| Maximum external dimensions | 55 mm wide x 194 mm high x 18 mm deep | |||||||||||||||||
| Weight | 100g (including dry batteries) | |||||||||||||||||
| Optional Board Sold Separately | ||||||||||||||||||
|
||||||||||||||||||
