|90,000yen(around the 1978 time)
It is the stereo power amplifier which realized direct-current-ization.
The phase distortion of a low-pitched sound
region was thought as important, direct-current-ization which excluded entirely
the condenser used as the damping time constant of a magnification circuit is
realized, and distortion is canceled.
Moreover, in the high region, the
frequency bandwidth before applying NF is improved, distortion is decreased, and
little distorted play is enabled over the broadband.
has gathered well, moreover dual FET which has large gm (mutual conductance), and extremely few noises of itself is developed and adopted, and high
S/N-ization is attained.
Moreover, operation which was stabilized very small
by adoption of this dual FET as for the drift of the output end electric
potential accompanying direct-current-izing is obtained.
construction which constituted the power source according to right-and-left
channel and two sets of monophonic amplifier on the same chassis is adopted, and
the extensive improvement of the separation is carried out at the same time it
loses the mutual intervention of a power-source part.
The heat sink of per channel and "0.35-degree-C/W" is attached to the exterior. Therefore, since a cooling effect can take greatly very much, the junction temperature of a power transistor can be used, stopping it low enough.
Since the speaker change
is using the relay for protection as it is, it does not have a speaker
changeover switch and is suppressing the fall of the dumping factor by the
contact resistance of a switch.
||direct-current power amplifier
|Output (20Hz - 20kHz)
|THD (8 ohms, 20Hz - 20kHz)
||0.007% (1W output)
|Cross modulation distortion (70Hz : 7kHz =
4:1 or 8ohms)
|Output bandwidth (IHF 0.1%, 8ohms)
||10Hz - 100kHz
|Frequency response (0.5W output)
|Remains noise (input end short-circuit)
|S/N (A network, input end short-circuit)
||100 (8 ohms, 20Hz - 20kHz)
|Conformity load impedance
||Output power: 390W
||Width 425x height 170x depth of 285mm