Audio Database

The

DIATONE M-P01
55,000yen(around the 1978 time)

Description
 
It is a small preamplifier of discrete composition of that the push switch and the four-layer pile printed circuit board realized.

MC head amplifier with the new style transistor adopted with the DA-P15 type is built in.

In the first rank of equalizer amplifier or tone amplifier, in order to lessen the noise generated from a transistor as much as possible, low noise FET selected carefully in respect of a noise and the engine performance is adopted. Furthermore, the S/N ratio is raised by forming a return circuit into low impedance.
Moreover, the 2 steps of differential magnification circuit + Class-A push pull of little distorted current mirror load is adopted in circuit, and the nakedness characteristic is improved, such as broadband-izing distortion at the time of an open-loop few. The negative return could be applied to stability by this, and the low distortion is realized.

Digital tone control is carried with the fixed register and the push switch.
Exact tone control is possible at a 2dB step by performing plus, selection of minus, and selection of the amount of change with a push switch. In addition, a tone control circuit will produce a surge in a frequency response also in a tone control flat position by CR damping time constant circuit. So, in M-P01, the tone-defeat switch is carried, a damping time constant circuit is completely separated at the time of Switch ON, and a flat frequency response is acquired.

While adopting a large capacity power supply as a power-source part, direct-current voltage is supplied to each unit amplifier through a constant voltage circuit. Thereby, stable operation of each unit amplifier is enabled.

The tape duplicate mechanism is carried and other sauce can be heard also in a tape copy.

The Subsonic Filter is carried.

The muting relay is built in and the clicking noise at the time of the power source ON is prevented.

Gilding is given to the phone input terminal and change by temporality is prevented.

Four

Rating of a mode
Form Control amplifier
Circuit system MC head amplifier: pure complimentary emitter grounding + Class-A pure contest SEPP
Equalizer amplifier tone amplifier: Caren Tom Ra addition FET differential +
The Darlington differential + Class-A pure contest SEPP with current mirror load
Input sensitivity/impedance Phono MC: 100 microvolts/ten ohms
Phono MM: 2.3mV/50kohm, 100pF
Tuner, Aux, Play1/2:150mV/50kohm
An Output voltage/impedance output: 1V (rating) / 600 ohms, 18V (maximum except take-off)
1/2:150mV of Rec(s)/600 ohms
Maximum permissible input MC:12mV
MM:290mV
Frequency response Phono: 20Hz-20kHz±0.2dB
Tuner, Aux, and Play1/2:10Hz-100kHz+0 -0.5 dB
THD Phono MC:0.005%
Phono MM:0.003%
Tuner, Aux, Play: 0.002%
Input conversion noise Phono MC:-157dB/V
Phono MM:-140dB/V
Tuner, Aux, and Play:-126dB/V
S/N Phono MC:78dB
Phono MM:88dB
Tuner, Aux, Play: 110dB
Tone control Bass: ±2/4/6/8dB (100Hz)
Treble: ±2/4/6/8dB (10kHz)
Subsonic Filter 18Hz, 6 dB/oct
Power source AC100V, 50Hz/60Hz
Power consumption 15W
Dimensions Width 270x height 70x depth of 247mm
Weight 3.2kg
Attachment Hexagon head wrench