Audio Database

The

Technics SE-A100 300,000yen (1985 release)
279,000 yen(1989 amendment)

Description
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Stereo power amplifier which carries a ClassAA circuitry.

Respectively different amplifier is made to take charge of voltage control amplifier and electric-current drive amplifier in a ClassAA circuitry. Thereby, voltage control amplifier was released from the current supply source, and the Low-noise-izing is realized by a voltage control being faithfully attained to an input signal. Moreover, electric-current drive amplifier was stabilized, and could supply the electric current required for a speaker drive, and the speaker drive capacity to have excelled is acquired.
In SE-A100, it has VC-4 composition which carries a total of voltage control amplifier and four sets of electric-current drive amplifier in each two right and left.

The Darlington stream composition which has an output transistor of a differential-amplification input stage and Pc150Wx2ch by a one chip Dual FET in voltage control amplifier is adopted, and it has become the perfect first class amplifier which realizes the super-low distortion for which the threshold of measured value is pressed.
Moreover, electric-current drive amplifier is the high-slew-rate swing amplification stage which allotted the bootstrap power supply an FET differential-amplification input and newly developed feed-forward type,It consists of output stages of Pc450Wx2/ch, and four-step Darlington using the output transistor of 3 parallel, and the large current for obtaining powerful power is supplied by 50 A/mu s.

Three transformer stream compositions are adopted as a power-source part, and the power transformer for electric-current drive amplifier of each right and left and the transformer for voltage drive amplifier on either side are carried. Moreover, in order to eliminate the cross interferencee of a right-and-left channel, the perfect symmetry construction is adopted. Furthermore, to the capacitor for power sources, it is total, and a 91,200-micro F electrolytic capacitor is carried.
While using an oxygen-free-high-conductivity-copper line for a power transformer, the high-density and the efficient technology by a full sort coil method are given, and the modification of the regulation is achieved. Furthermore, it is ~(ing) by the special resin in the magnetic shielding case of three-fold total, and ill effects, such as an equipment oscillation and a magnetic flux leakage, are stopped.

In order to stop that the electromagnetic radiation treating large currents, such as an output stage and a power-source part, from a section has an ill effect, the original concentrated power block which unified the output stage and the power-source part is adopted, and the influence of electromagnetic field is suppressed.

The top plate is considering it as a 2.3kg heavy weight class by 3mm thickness, and is suppressing the magnetic radiation and the equipment oscillation together with adoption of the 2mm thickness insulator rubber at the high-rigidity chassis of 2mm thickness, and the bottom face of a transformer.
moreover, the punching network with a high open aperture ratio is used for a top plate and a sole plate, and the radiator which determined form in a computer analysis, and a space at the bottom are secured -- the high heat-dissipation effect has been acquired with the large-sized foot (high and phi50mm) 21mm.

To the earth line, the oxygen-free-high-conductivity-copper bus bar of thickness 2mm.10mm width has been arranged, and the LC-OFC code is adopted as product-line material.

The electronic formula speaker selector is adopted and the golden cladding contact is used for a switching relay. Moreover, the last one memory functionality in which after the power source off holds the description of a selection is equipped.

The large-sized power meter which can carry out the Direct reading of from 0.0001W to 300W is carried.
Furthermore, the bronze glass of 10mm thickness is used for a front.

VC-4 indicator which can check an operation of voltage control amplifier and electric-current drive amplifier is carried.

DC / normal 2 way input terminal is carried.

The outer-diameter phi7.4mm very-thick cable which used 50 core oxygen-free-high-conductivity-copper line is adopted as the power cable.

The oxygen-free-high-conductivity-copper pin code with a gilding termination is attached.

Rear
Internal

Rating of a mode
Form Stereo power amplifier
Output power (20Hz - 20kHz) 240W+240W (4 ohms, 0.002%)
200W+200W (6 ohms, 0.001%)
170W+170W (8 ohms, 0.0007%)
Dynamic power (IHF) 600W+600W(2ohms) /600W+600W (2ohm}60-degree reactance load intensity)
400W+400W(4ohms) /400W+400W (4ohm}60-degree reactance load intensity)
275W+275W(6ohms) /275W+275W (6ohm}60-degree reactance load intensity)
225W+225W(8ohms) /225W+225W (8ohm}60-degree reactance load intensity)
Distortion (-3dB)
1kHz: Below a limit of measurement (0.0002%) (6ohms)
Below a limit of measurement (0.0002%) (6ohm}60-degree reactance load intensity)
Below a limit of measurement (0.0002%) (8ohms)
Below a limit of measurement (0.0002%) (8ohm}60-degree reactance load intensity)
20Hz - 20kHz : 0.0009% or less (6ohm/6ohm}60 degree)
0.0007% or less (8ohm/8ohm}60 degree)
Frequency characteristic 0.8Hz-150kHz+0 -3 dB
20Hz-20kHz+0 -0.1 dB
Output bandwidth 5Hz - 100kHz (cpo-3dB, 0.01%, 8ohms)
SN ratio 120dB(IHF'66)
93dB(EIAJ)
Remains noise voltage 300 microvolts or less (Lin.)
50 microvolts or less (IHF-A)
Input sensitivity/impedance 1.2V/47kohm
Dumping factor 120 (8ohms)
Meter indicating range 0.0001W-300W (8ohms)
- 60dB - +2dB
Meter indication precision }3dB (-40dB or more)
}5dB (less than -40dB)
Meter attack time 100 microseconds
Recovery time 300ms
Power consumption 400W
Power source AC100V, 50/60Hz
Dimensions Width 476x height 209x depth of 475mm
Weight 33.7kg