|398,000 yen(in the late 1980's )
A vacuum pipe and the stereo power amplifier of the hybrid concept which adopted
The vacuum pipe is adopted as the drivers of all the voltage
magnification stages and output stages.
Coupling of the front end constituted from this vacuum pipe is carried
out to the output stage by low impedance / Hi-Current MOS FET, and the
power response of MOS FET has been obtained, having a sound peculiar to
vacuum-pipe amplifier by this.
counter point does not accept the improvement in the characteristic by NFB as a
musical thing, the output stage does not constitute the NFB loop.
having non NFB circuit composition, the capability of SA-12 is polished by
adopting the thorough ground processing and the current supply circuit designed
For a reason when a direct-current portion flows when a power
source is switched on, or some very thing of an outbreak happens to AC power
supply, the automatic muting mechanism is carried and the speaker is protected.
The reliability of amplifier is considered as an important factor, it is
designed, and parts especially with high reliability including the German
roederstein metal film air register have realized all the circuits.
quality of not only the physical characteristic but the music reappearance [
itself ] is improved.
There was also a silver type in addition to a
||Hybrid stereo power amplifier
||47kohm (100pF o'clock)
||1% or less (at the time of 80 ohms and an
||5Hz - 100kHz
|Signal to noise ratio
||92dB or more
||8.9 (8 ohms, 1kHz)
||8 (Futami pole pipe)x4 6DJ
||Width 480x height 113x depth of 322mm