The stereo Integrated Amplifier which concentrated the technical capabilities
of the Lo-D to the development goal, and developed to it making the amplifier
which is synthetically worthy.
2 steps of
differentials constant current drive emitter setting inverted Darlington pure
complimentary OCL circuitry was used for the power amplifier part, and it has
realized the low distortion.
Moreover, the linearity of a current
characteristic is good by the parallel push pull of the pair transistor to which
the property was equal, and also the large capacity power supply has realized
the faithful transmit from the Koide power to the Oide power.
three-step stream composition which used the FET differential amplifier for the
first rank is adopted as the equalizer stage, and a big dynamic margin and low
distortion have been obtained by driving with ±2 power source.
difference input form three-step stream-composition amplifier as an equalizer
circuitry is used for a tone control circuit, and the final stage serves as an
emitter-follower by a constant current load intensity. Thereby, the failure of
an SN ratio and the surge of the frequency characteristic by the location of a
tone are stopped.
Moreover, to this tone control, it is able for the change
of a turnover frequency to be able to perform Bass and three steps of Treble(s), and to adjust them to a more favorite tone quality. Furthermore, it is also
possible to acquire the flat frequency characteristic with a tone-defeat
22 contact switchpoint type Attenuator is adopted as a
Moreover, the 3 steps of additive expression gain selector is
Loudspeaker B level adjustment is carried.
termination of Phono2 can carry out 6dB variable [ of the input level ].
The electronic formula protection network is carried.
filter and the high filter of a two-step switching type are carried.
mode switch and the loudness switchpoint are carried.
|<Power amplifier part>
||2 steps of differentials whole page hardwired-connection grounded-emitter
|20Hz - 20kHz, both channel drive :
|1kHz, both channel drive :
|1kHz, one-side-channel drive :
|Dynamic power (IHF)
||0.1% (at the time of an effective output)
0.006% (at the time of 1 / 2 effective output 1kHz)
|Cross modulation distortion (70Hz:7kHz=4:1)
||0.03% (at the time of an effective output)
0.03% (at the time of 1W output)
||6Hz - 50kHz
||6Hz-60kHz+0 -1 dB
||A, B, C:4ohms - 16ohms
Headphone jack: 4ohms - 16ohms
||60 (1kHz, 8ohms) or more
|S/N (IHF, A network)
||100dB or more
||Equalizer amplifier: The differential
three-step hardwired connection per step, an FET using
Control amplifier: NF
form, a first rank FET using
Phono2:1.6-6mV/50kohm (succession variable)
Tuner, Aux1, 2, Tape PB1,
|Phono maximum permissible input
||Phono1:430mV (RMS, 1kHz)
(RMS, 1kHz) of Phono(es)
|An Output voltage/impedance
|Tape rec1, 2 :
||1V/28 ohm (rate)
15V/28 ohm (maxima)
||Phono(RIAA deflection): 30Hz-15kHz±0.3dB
||±10dB (50Hz, 100Hz, 150Hz)
frequency: 150Hz, 300Hz, 600Hz
||±10dB (6kHz, 10kHz, 20kHz)
frequency: 1.5kHz, 3kHz, 6kHz
||Low: 15Hz/30 Hz, 12dB / oct
8kHz/16 kHz, 6dB / oct
|Loudness control (Volume-30dB)
||+ 13dB (100Hz), +7dB (10kHz)
|S/N (IHF, A network, input short-circuit)
Tuner, Aux, Tape PB: 90dB
||- 5, -10, -20dB (addition is possible)
|The semiconductor used
||Transistor: 61 pieces
FET: Eight pieces
Diode: 32 pieces
||Power-switch interlock: One line
Power-switch un-interlocking.: Two lines
(Electrical Appliance and Material Control Law)
||Width 468x height 188x depth of 395mm