Audio Database

The

DIATONE DA-A10
80,000yen(around the 1976 time)

Description
 
It is the power amplifier of Feature series.

2 monophonic construction which constituted the power source according to right-and-left channel and two sets of monophonic amplifier on the same chassis is adopted.
For this reason, the mutual intervention from a power source was suppressed and the separation between channels is improved sharply.

The 3 steps of symmetrical complimentary Darlington OCL circuit and the 2 steps of differential amplification current mirrored live system are adopted.
The low distortion is possible by the three-step Darlington circuit where direct-current current gain is large, and using few current mirror circuits possible [ an object drive ] and distorted by high gain.

By combining the transistor which was excellent in the current mirrored live and the high frequency characteristic, the improvement of the standup characteristic of a pulse and the distorted characteristic of a high region is aimed at.

Two power transformers of 200VA and two capacitors for power sources of 63V or 10000-micro Fx2 are used for a power supply circuit.

The huge heat sink of 0.35 degree C per channel/W is attached outside.
A cooling effect becomes very high by this, and the junction temperature of a power transistor can be stopped low enough, and can be used.
High reliability is conjointly secured with the parallel push pull of the power transistor of Pc=100W.

The relay for protection is used for the change of a speaker as it is.
Since there is no conventional speaker changeover switch by this, there is no fall of the dumping factor by the contact resistance of a speaker changeover switch.

Docking with the preamplifier of Feature series is possible, and remote control by a preamplifier is possible.


Rating of a mode
Form Stereo power amplifier
Output
20Hz - 20kHz : 100W+100W (8ohms)
135W+135W (4ohms)
1kHz: 115W+115W (8ohms)
155W+155W (4ohms)
Music power : 320W (8ohms)
600W (4ohms)
EIAJ (distorted 5%) : 250W (8ohms)
400W (4ohms)
THD
At the time of an Output power : 0.1%
At the W (20Hz - 20kHz) time of one : 0.02%
Output power (-3dB, 1kHz) : 0.003%
Cross modulation distortion (1W, 50Hz:7kHz=4:1) 0.03%
Input sensitivity/impedance 1V(variable) /50kohm
Frequency response (0.5W, -0dB one dB) 10Hz - 100kHz
Output bandwidth (IHF 0.1% distortion) 10Hz - 50kHz
Dumping factor 100
Channel separation
1kHz: 90dB
20kHz: 80dB
Remains noise 0.30mV
Muting time 5 seconds
Conformity load impedance 4-16ohm
Power source AC100V 50Hz/60Hz
Power consumption
Electrical Appliance and Material Control Law : 240W
Output power (8ohms) : 380W
Dimensions Width 425x height 170x depth of 285mm
Weight 16.5kg