|Technics EAA-2006/Technics 10A
||135,000yen(around the 1966 time)
Stereo control amplifier of a technics series.
The amplification part consists of two-step NF circuitries, and has
obtained the Low-noise-izing and the big dynamic range.
The hum and the
noise are reduced with inserting a transistor ripple filter in the rectifier
circuit of a heater, and carrying out the perfect direct-current ignition, and
also shielding a power-source part completely.
The new style CR tone
control which becomes a flat completely at the middle point of a volume is
adopted as a tone control part.
In this circuitry, at the time of an
elevation, C is accepting one piece, and is operating, the time of descent does
not have a surge in a property, and the flat transition property has been
acquired. Moreover, a bass and loud sound can switch three steps of changing
points of a property.
±1% of precision resistor is used for an equalizer
circuitry, and also every set is surveyed, and it is adjusted to the error not
more than ±0.3dB at 30Hz and 15kHz.
Moreover, although the playback curve of
the tape head termination is united with the property of NAB, it can be united
also with the property of head each.
The push switch is adopted as an
input switching. Moreover, a semipermanent part can be adjusted from the front.
||Tube control amplifier
|Input sensitivity (1kHz, output 1V)
(Aux1 can be adjusted)
||Phono: 30Hz - 15kHz (deflection of ±0.3dB
from a RIAA curve)
Deflection of ±0.5dB from a Tape Head:NAB curve and a
high region are coordination possibles.
Tuner and Aux:10Hz-50kHz+0 -1 dB
||3 steps of changing point change possible
Bass: 500Hz, 250Hz, 125Hz
Treble: 2kHz, 4kHz, 8kHz
||Run bull: 30Hz, 12dB / oct
8kHz, 12dB / oct
|S/N ratio (IHFM specification, ASA
A curve, input short-circuit
Tuner, Aux: 90dB
||10V (HT 0.1%, 1kHz)
|The semiconductor used
||Thermionic tube (eight pieces): 7:8 12AX
Transistor: One piece
Diode: Eight pieces
||Width 420x height 140x depth of 250mm