Audio Database
E-306V
Commentary

The E-306 has been refined for further aging, and the sound quality has been thoroughly polished.

The output element of the power amplifier section uses a power transistor for high-output audio, which has excellent characteristics such as high-frequency characteristics, linearity of current amplification factor and switching.
This element is composed of parallel push-pull and mounted on a large heat sink for efficient heat radiation and stable operation.

A current feedback amplifier circuit without phase rotation is used for both 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 trans-impedance 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 excellent dynamic characteristics and natural energy response are realized.

The line amplifier section consists of discrete parts using a current feedback amplifier circuit.
The basic design is an original AccuPhase, a pure complimentary service push-pull design with a relatively simple design. This design reduces the amount of phase compensation for each stage and further improves sound quality.

In order to configure the shortest and straight signal path, a logic relay control relay control method that electronically controls the relay.
The relay uses a closed type relay for the communication industry. The contact is a gold-plated crossbar twin system, which realizes low contact resistance and high durability.

The tone control uses the additive active filter method used in full-fledged graphic equalizers.
In this method, the original flat signal passes straight through, and control is performed by making another characteristic as necessary and adjusting it from the flat signal.

Equipped with a large solid brass machined speaker terminal that can be used with very thick speaker cables.

A large transformer with a large power capacity of approximately 500 VA is used in the power supply section, and two filter capacitors with a capacity of 22,000 μ F are installed.

Equipped with a large peak power meter to monitor output power.
This meter is logarithmic compression type, so you can see a wide dynamic range at one time.

The preamp section and power amplifier section are separated, and a change-over switch and input / output terminal are mounted for use as an independent amplifier.

Equipped with 2 balanced inputs.

Comes with a remote commander that can adjust the volume and switch the input selector.

There is a slot on the rear panel where you can insert an Accuphase Analog Bus (AAB standard) option board.

Model Rating
Type Integrated Stereo Amplifier
Rated continuous average power
(double-channel operation, 20 Hz to 20 kHz)
140W/ch (4 Ω)
120W/ch (6 Ω)
100W/ch (8 Ω)
Total Harmonic Distortion Factor (both channel operation) 0.035% (4 Ω - 16 Ω load)
IM Distortion Factor 0.01%
Frequency Response
Main amp input: 20 Hz to 20 kHz + 0 -0.2 dB at rated continuous average output
2 Hz ~ 150 kHz + 0 -3.0 dB at 1W output
High Level input: 20 Hz to 20 kHz + 0 -0.2 dB at rated continuous average output
Damping factor 100 (8 ohm load, 50 Hz)
Input Sensitivity / Impedance
(Rated Output / EIA1W output)
High Level input : 113mV/11.2mV/20k Ω
Balanced input : 113mV/11.2mV/40k Ω
Main input : 1.13V/112mV/20k Ω
Rated Output / Impedance Pre output : 1.13V/50 Ω (at rated continuous output)
Gain Main input → output : 28 dB
High Level input → Pre output : 20 dB
S/N, input conversion noise
Input Short A-Compensation EIA S/N
S/N at rated input Input Conversion Noise
Main amp input: 122dB -121dBV 100dB
High Level input: 104dB -123dBV 80dB
Balanced input: 88dB -107dBV 80dB
Tone Controls Bass (300 Hz) + / - 10 dB (50 Hz)
Treble (3 kHz) : ± 10 dB (20 kHz)
Loudness Compensator + 6 dB (200 Hz, Volume -30dB)
Power Meter Logarithmic Compression Peak Level Display
Direct reading of output at dB scale and 8 Ω load
Load Impedance 4 ω - 16 ω
Headphone jack Applicable Impedance : 4 Ω ~ 100 Ω
Power Supply 100 VAC, 50Hz/60Hz
Power Consumption 50W (no input)
240W (Electrical Appliance and Material Control Law)
385W at 8 Ω load rated output
Maximum External Dimensions 475 mm wide x 170 mm high x 418 mm deep
Weight 20.5kg
Included : Remote Commander RC-22
Remote Control Method Infrared Pulse Method
Power Supply DC 3V
Dry Battery AA, 2 pcs
Maximum External Dimensions 45 mm wide x 136 mm high x 18 mm deep
Weight 85g (including dry batteries)
Sold Separately : Option Board
Line-10 Line Input Board Line-10 (¥ 8,000)
General, unbalanced high-level input terminal.
Play analog signals such as CD players and tuners.
ad-10 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