It is the control amplifier used as DA-A100 and a pair.
By adoption of irregular 2 power sources (+75V, -12V), the base electric
potential of the first rank transistor is the same as that of ground electric
potential. Since the leak current of a coupling capacitor is lost by this and
also base bias is supplied from the ground, excessive current will not flow into
a cartridge at the time of a power-source injection.
By making power
supply voltage high with 86V, and choosing a profit moderately, even if an
allowable input is large (260mV), the gap in the high region in a RIAA curve is
The BAX type is adopted as tone control.
surges at the time of change are lost, and also it is designed at the time of a
tone control flat become the same as the state where the defeet was carried out.
The amplifier for tone control is performing voltage magnification in
two steps by the combination of differential amplifier and emitter grounding.
Thereby, those with about 70dB, and also when it boosts, an open-loop gain
requires sufficient NFB and is suppressing distorted aggravation.
a system which does not change the sound quality which is to foundations by
making a signal course the same at the time of a tone control operation and
Monitor amplifier is built in.
Especially the amplifier circuit for a monitor and Line out is designed it be equal to a low
load impedance (100ohms or more) or long-distance wiring (for it to be 200m with
a shield line).
Tuner, Aux1, 2,
Tape P.B.1, 2:150mV/100kohm
|Output sensitivity / impedance
||Main out1 and 2:1V/50 ohm
Monitor: 1V/47 ohm
Tape rec1, 2:150mV/470 ohms
||20Hz - -20kHz 0.5dB
||Bass: ±10dB (100Hz, 50Hz)
|Equalizer input conversion noise
||- 118dB(V) -- the following (flat)
126dB(V) -- the following (A curve compensation)
|The semiconductor used
||Transistor: 34 pieces
Diode: Ten pieces
||Width 476x height 180x depth of 262mm