|120,000yen (around the 1975 time)
Stereo power amplifier which carries a 4 steps of
An Output load impedance can be switched
to four steps, 0.08ohm (normal), 0.8ohm, 2.7ohm, and 8ohm. The circuitry serves
as a bridge scheme without a gain transition.
A dumping factor is changeable
with this Output-load-impedance change, and it is possible to pull out the
performance of a speaker more and it becomes the numeration which is switched to
100, 10, 3, and 1 in the case of an 8-ohm speaker.
The circuitry of the power amplifier part is based on differential-amplification
whole page hardwired-connection perfect complimentary OCL, and the work
which realizes a low distortion and a high stability amplification everywhere
is carried out.
While inserting the emitter-follower in the differential-amplifier following
stage, increasing first rank amplification degree to it and improving an
SN ratio, the impedance matching to the predrive stage was rationalized,
and the distorted occurrence is prevented.
Moreover, in the predrive stage, while removing a bootstrap capacitor and
raising low-pass stability, the stability of the output stage is also raised.
A power-source part adopts the
constant-voltage regulated power supply of ±42V as the voltage amplification
stage, and has adopted a mass transformer and a 10,000-micro F capacitor as an
The output Direct-reading peek detection type power meter
This meter can adjust three steps of meter range, and can read
the movement toward an output in a higher precision.
network original with technics by relay is adopted.
In this circuitry, relay
contact resistance does not go into a signal system, and years of using does not
have a tone-quality failure, either.
As a shocking noise insulator
circuitry at the time of the power source ON, the zener diode of the
common-emitter power source of a differential amplification, diode, the
capacitor, and the timing circuit constituted from a resistor are carried.
||Stereo power amplifier
||A one side channel, 1kHz:110W/110W (4ohms)
Both channel, 1kHz:103W+103W (4ohms)
Both channel, 20Hz-20kHz:93W+93W (4ohms)
||5Hz - -70kHz three dB (both ch(es), 8ohms)
||5Hz-100kHz+0 -3 dB
||4ohm: 50, 5, 1.5, 0.5
8ohm: 100, 10, 3,
||Main or Remote: 4ohms - 16ohms
Main+Remote: 8ohms - 16ohms
||Width 450x height 173x depth of 380.5mm