Audio Database


Technics SE-A7000 * Build-to-order article
450,000yen (December, 1992 release)

Stereo power amplifier which adopted the newly developed MOS class AA circuitry

The MOS class AA circuitry is carried.
In the class AA circuitry, high power and perfect Class-A voltage control are realized by performing the current supply source which makes a voltage amplification and speaker of the music signal inputted from the source drive with respectively different amplifier. In the MOS class AA circuitry, this class AA amplifier is used as the base, and MOS FET which is the amplification element the input impedance excelled [ element ] in the RF property very highly as a new element is adopted as voltage control amplifier. This is raising the linearity of signal control further.
And speaker drive power has been improved by the powerful current supply source by a bipolar transistor, and stable high output is realized.

Ten total numbers and the total capacity of 75,000 micro F carry the mass electrolysis aluminum capacitor of the newly developed MASTER series in the capacitor.
This capacitor has improved the mechanical property by using the newly developed special vibration suppression aluminum for a case.

Three power transformers are carried and are used one set for the voltage control amplifier of one set and both channels for the current-supply-source amplifier of a right-and-left channel, respectively.
While using an oxygen-free-high-conductivity-copper line for these transformers, the regulation which was excellent with the high-density efficient technology is realized. Furthermore, by enclosing in three-fold magnetic shielding case which enclosed the special resin, an equipment oscillation and leakage flux are stopped and electrical noise is reduced sharply.

The sub- wood of 3mm thickness heavy weight class top plate, high-rigidity chassis, large-sized insulator, and real wood specular surface finish etc. is adopted, and the magnetic radiation and the equipment oscillation are reduced sharply.

The balance input terminal is carried.
This termination has realized the transmit stabilized by giving a severe shielding so that influence of the transformer scheme of the balance volume which stopped the degree of unbalance, and an external magnetism may not be received in DL type permalloy core.

The high-order-accuracy large-sized power meter in which the bronze glass of 10mm thickness was inserted is carried.
This meter can carry out the Direct reading of 0.0001W-300W.

The OFC bus bar and the LC-OFC internal wiring are adopted.

The electronic formula speaker selector is adopted. The reliable golden cladding contact is adopted as a switchover of a termination.
Moreover, the gilding large-sized termination mounted on the aluminum base is adopted as a speaker termination.

The internal construction made the right-and-left channel the twin monophonic structure where it became independent, respectively, and has improved the noise and crosstalk which are generated among both channels.

The newly developed non-inductive resistance object is adopted.
This resistor is raising the content of the alumina of the insulator which is a base material. With the Joule's heat emitted itself, it prevents barring signal regeneration and the high region response is raised.

The PC-OCC power cord with a polar window is adopted.

The speaker termination and input county of a real panel
The Newly
Newly developed unguided high-quality sound low antibody
The high-quality sound aluminum electrolytic capacitor for L channels

Rating of a mode
Form Stereo power amplifier
Output power 240W+240W (4 ohms, 20Hz - 20kHz, 0.005%)
200W+200W (6 ohms, 20Hz - 20kHz, 0.005%)
170W+170W (8 ohms, 20Hz - 20kHz, 0.005%)
Frequency characteristic 20Hz-20kHz+0 -0.1 dB
0.8Hz-150kHz+0 -3 dB
S/N ratio 93dB(EIAJ)
Input sensitivity/impedance Normal/DC: 1.2V/47kohm
Balance: 1.2V/600 ohm
Meter indicating range 0.0001W-300W (8ohms)
Power source AC100V, 50Hz/60Hz
Power consumption 420W
Dimensions Width 483x height 208x depth of 473mm
Weight 38kg