Audio Database

The

DIATONE DA-P15/DA-P15S DA-P15: 75,000yen(around the 1978 time)
DA-P15S: 74,000yen(around the 1979 time)

Description
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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.
Moreover, 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 built in.

The tone-defeat mechanism is built in.

The Subsonic Filter which cuts a super-low-pass noise is carried.

A turnover change is possible.

The muting relay at the time of the power source ON is built in.

There were two kinds, DA-P15 which carries the carrying handle for rack-mounted one, and DA-P 15S not carrying a carrying handle.

The

Rating of a mode
Form Preamplifier
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
Rec out1, 2:150mV/600 ohms
Phones: 600mV/15 ohms
Frequency response Phono(RIAA deflection): 20Hz-20kHz}0.2dB
Tuner, Aux, Tape1, and 2:10Hz-100kHz+0 -0.5 dB
THD (1V output)
Volume 20dB, 20Hz - 20kHz
Phono1, 2 MM: 0.003%
Phono2 MC:0.005%
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)
Channel separation
(Input end short-circuit, 20kHz)
Phono:80dB
Tuner, Aux, Tape1, 2:105dB
Tone control
Bass: }10dB (100Hz, turnover frequency of 500Hz)
}10dB (50Hz, turnover frequency of 250Hz)
Treble: }10dB (10kHz, turnover frequency of 2.5kHz)
}10dB (20kHz, turnover frequency of 5kHz)
Dimensions DA-P15: Width 480x height 108x depth of 349mm
DA-P 15S: Width 424x height 108x depth of 338mm
Weight DA-P15:7kg
DA-P15S:7kg