Accuphase E-530

Commentary

This integrated amplifier has been developed as the highest level by combining the design technology cultivated up to now with the latest circuit and high-grade materials.

The output amplifier stage employs a power MOS FET with negative thermal characteristics. The pure class A operation with 3 pairs of parallel push-pull drive per channel guarantees stable linear power up to ultra-low impedance loads. The parallel connection can reduce output impedance and internal noise, and can disperse heat generated from the device. In addition, the low linear power region of the MOS FET with excellent linearity can be used efficiently to improve performance and sound quality.

Both the preamp and power amplifier sections use a current feedback amplifier circuit that feeds back in the form of current and has excellent high-frequency phase characteristics and sound quality.
Since the impedance of the feedback input part is very low in this circuit, phase rotation hardly occurs, and as a result, there is almost no need for phase guarantee. Therefore, various characteristics can be greatly improved with a small amount of NFB, and natural energy response can be obtained even in sound quality with excellent dynamic characteristics such as rise.

The line amplifier section consists of discrete parts using a current feedback amplifier circuit.
The circuit configuration is pure complimentary service push-pull, and the input elements are parallel to reduce noise.

A logic relay control method is adopted to configure the shortest and straight signal path.
The relay used in this system is a closed-type relay for the communication industry. By using a gold-plated cross-bar twin system for contacts, low contact resistance and post-durability are realized.

An additive active filter method is used for tone control.
In this method, the original flat signal passes straight through, and the sound quality is adjusted by adding or subtracting the characteristics from the flat signal as needed.

The power supply section is equipped with an approximately 450 VA toroidal power transformer fixed to a high-efficiency, non-resonant aluminum case and two 40,000 μ F aluminum electrolytic capacitors for filters.

Equipped with an analog peak power meter.

An insulator made of high carbon cast iron is used.

It has a built-in headphone amplifier circuit to emphasize sound quality.

Equipped with an Ext Pre button and a preamplifier output / power amplifier input terminal for independent use of the pre-section and power section.

It is equipped with a compensator function that increases the bass range when the volume is low.

Comes with a remote commander capable of volume adjustment and input switching.

Two optional board slots allow for additional digital input boards and analog disk input boards.

Model Rating

Type	Integrated stereo amplifier
Rated continuous average power (both channel operation, 20 Hz to 20 kHz)	150W/ch (1 Ω, music signal only) 120W/ch (2 Ω) 60W/ch (4 Ω) 40W/ch (6 Ω) 30W/ch (8 Ω)
Total harmonic distortion factor (both channel operation, 20 Hz to 20 kHz)	0.05% (2 Ω) 0.02% (4 Ω ~ 16 Ω)
IM distortion factor	0.01%
Frequency characteristic	High Level input/Main input: 20 Hz ~ 20 kHz + 0 -0.2 dB (at rated continuous average output) 2 Hz ~ 150 kHz + 0 -3.0 dB at 1W Output
Damping factor	120 (8 Ω load, 50 Hz)
Input Sensitivity / Impedance (Rated Output / EIA1W Output)	High Level input : 61.7mV/11.3mV/20k Ω Balanced input : 61.7mV/11.3mV/40k Ω Main input : 0.617V/113mV/20k Ω
Output Voltage / Impedance	Pre output : 0.617V/50 Ω (at rated continuous output)
Gain	High Level input → Pre output : 20 dB Main input → output : 28 db
S/N, input conversion noise	Input short / A-correction EIA S/N S/N at rated output Input reduced noise High Level input: 106dB -131dBV 80dB Balanced input: 92dB -117dBV 80dB Main input: 118dB -122dBV 102dB
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)
Attenuator	-20dB
Power meter	Logarithmic compression type peak level display Direct reading of output at dB scale and 8 Ω load
Load impedance	2 Ω ~ 16 Ω
Headphone port	Applicable Impedance : 8 Ω ~ 100 Ω
Pwer	100 VAC, 50Hz/60Hz
Power consumption	180W (no input) 280W (Electrical Appliance and Material Control Law) 250W (at 8 Ω load rated output)
Maximum external dimensions	Width 475x Height 196x Depth 422 mm
Weight	25.0kg
Attachment	Remote Commander RC-29 AC power cord
Optional Board Sold Separately
No Image Line Input Board Line-9 (¥ 6,000) General high-level input terminal of unbalanced type. Plays analog signals such as CD players and tuners. No Image Analog Disk Input Board AD-9 (¥ 30,000)Equipped with a high-gain equalizer, it is compatible with all types of cartridges. MM/MC switching, MC input impedance and subsonic filter on/off can be set by the internal DIP switch. MM Gain : 36 dB Input impedance : 47k Ω MC Gain : 62 dB Input impedance : 10, 30, 100 Ω switching Line Input Board Line-10 (¥ 8,000) General high-level input terminal of unbalanced type. Plays analog signals such as CD players and tuners. Analog Disk Input Board AD-10 (¥ 50,000) Equipped with a high-performance high-gain equalizer, it is compatible with all types of cartridges. MM/MC switching, MC input impedance and subsonic filter on/off can be set by the internal DIP switch. MM Gain : 29 dB Input impedance : 47k Ω MC Gain : 60 dB Input impedance : 10, 30, 100 Ω switching No Image Digital Input Board DAC-10 (¥ 50,000) Equipped with an MDS (multiple ⊿ Σ) D/A converter and coaxial / optical input terminals. Digital music signals (sampling frequency 32 kHz to 96kHz/24bit) are supported. DAC-10 cannot be used for E-407, E-406V, E-306V, E-211, and C-265.