||DA-P15: 75,000yen(around the 1978 time)
|DA-P15S: 74,000yen(around the 1979 time)
It is the preamplifier which aimed at low distortion by improving foundations.
Low noise FET selected carefully in respect of a
noise and the engine performance out of many transistors is adopted as the first
rank of equalizer amplifier. The noise which this generates from a first rank
transistor was lessened as much as possible, and S/N is improved.
S/N is improved more by lowering the impedance of a RIAA return circuit.
About the remains noise which affects the engine performance of tone amplifier
greatly, low noise FET which fully examined the noise characteristic of
the transistor of the first rank is adopted like equalizer amplifier, and
the noise is decreased.
Furthermore, a return circuit is formed into low impedance and
high S/N-ization is attained.
Equalizer amplifier tone amplifier has adopted the 2 steps of differential magnification circuit of current mirror load. And the distortion by fully improving the nakedness characteristic and lessening distortion at the time of an open-loop, and broadband-izing it further etc. applying a negative return stably few.
Moreover, few distorted elements are adopted and low distorted-ization
is attained by considering circuit composition.
About MC head amplifier, it stood on the view
of regazing at the transistor itself, the transistor different from the former
is adopted, and the new circuit which decreases a noise is devised and adopted.
Not only a signal circuit but 2 monophonic construction which separated
the right-and-left channel from the power source to the ground is adopted.
The tape duplicate switch is carried.
Headphone amplifier is
The tone-defeat mechanism is built in.
Filter which cuts a super-low-pass noise is carried.
A turnover change
The muting relay at the time of the power source ON is
There were two kinds, DA-P15 which carries the carrying handle
for rack-mounted one, and DA-P 15S not carrying a carrying handle.
|Input sensitivity/input impedance
||Phono1, 2 MM:2.3mV /, and 50kohm, 100pF
Phono2 MC: 0.1mV/ten ohms
Tuner, Aux, Tape1, 2:150mV/50kohm
|An Output voltage/Output load impedance
||Output1 and 2:1V/600 ohm
Phones: 600mV/15 ohms
||Phono(RIAA deflection): 20Hz-20kHz}0.2dB
Tuner, Aux, Tape1, and 2:10Hz-100kHz+0 -0.5 dB
|THD (1V output)
Volume 20dB, 20Hz -
|Phono1, 2 MM: 0.003%
Tuner, Aux, Tape1, 2:0.002%
|S/N (A network)
||Phono1, 2 MM: 84dB (input end short-circuit)
Phono2 MC: 77dB (47ohms of input end termination)
Tuner, Aux, Tape1,
2:110dB (input end short-circuit)
Tuner, Aux, Tape1, 2:105dB
||}10dB (100Hz, turnover frequency of 500Hz)
}10dB (50Hz, turnover frequency of 250Hz)
||}10dB (10kHz, turnover frequency of 2.5kHz)
}10dB (20kHz, turnover frequency of 5kHz)
||DA-P15: Width 480x height 108x depth of
DA-P 15S: Width 424x height 108x depth of 338mm