Technics SE-A3000

Commentary

A stereo power amplifier using TAKEII electrolytic capacitors and MOS class AA system.

The circuit structure is based on a class AA circuit with a MOS class AA circuit using a MOS FET as an amplifying element.
In a Class AA circuit, voltage amplification and current supply are performed by separate amplifiers, and all current to the speakers is supplied from the current supply amplifier by the Class AA Bridge effect. This allows the voltage controlled amplifier to operate at an ideal full class A operation with an output of 0 and to display excellent characteristics of the device.
The class A operation voltage control amplifier of the SE-A3000 uses MOS FET, an amplifier element with extremely high input impedance and excellent linearity, and realizes low distortion factor. The current supply amplifier uses bipolar transistor with low loss and high output operation, and speaker drive power is improved by strong current supply.

TAKEII electrolytic capacitors are used for smoothing the power supply of power amplifiers.
This capacitor is an upgraded version of an electrolytic capacitor using a bamboo mixing separator. Mechanical and electrical characteristics have been greatly improved by improving the aluminum foil and electrolyte, which are the basic structure of the capacitor, and by installing a spiral coil on the outside of the aluminum case, high-frequency characteristics have been improved and sound quality in the middle and high range has been improved.

The use of high-rigidity chassis, large insulators, and real wood mirror-finished side woods reduces the adverse effects of vibration.

The internal construction adopts a twin monaural configuration in which the power supply and the power amplifier block are composed of two monaural amplifiers, and the left and right are independent.

Equipped with a high-precision large peak power meter that can directly read from 0.001W to 300W.
This power meter is equipped with a light ON/OFF switch.

The input terminal is equipped with Direct terminal and Normal terminal with left and right independent level volume.
It also has a XLR canon input terminal for balance input.

3P-2P type detachable power cord is used.

Model Rating

Type	Stereo power amplifier
Rated output	140W + 140W (4 Ω, 20 Hz to 20 kHz, 0.02%) 120W + 120W (6 ω, 20 Hz-20 kHz, 0.015%) 100W + 100W (8 Ω, 20 Hz to 20 kHz, 0.01%)
Frequency characteristic	20 Hz ~ 20 kHz + 0 -0.2 dB 0.8 Hz ~ 150 kHz + 0 -3dB
Signal-to-noise ratio	108dB(EIAJ) 129dB(IHF'66)
Input Sensitivity / Impedance	Unbalanced : 2V/10k Ω Balanced : 2.2V/20k Ω
Meter indication range	0.001W ~ 300W (8 Ω)
Pwer	100 VAC, 50Hz/60Hz
Power consumption	248W
External dimensions	Width 483x Height 186x Depth 431 mm
Weight	25.6kg