|275,000yen(around the 1982 time)
Master integrated DC amplifier which supplied
technical [ that pursued the ideal configuration object of i integrated
amplifier, and devoted in sound / all ], and was developed.
FF& diamond differential circuit is adopted as the power stage.
FF system is what combined NFB and feed forward, and cancels all distortion
theoretically generated in the power stage. The structure of this system
amplifies a distorted denial signal like a vermilion signal circuit with the
error collection amplifier which forms the extraction and the feed-forward
circuitry for the distorted component after the predrive stage by that distorted
component detection action, and is compounding two signals with the output while
it reduces distortion by NFB. Moreover, the summing point is coincided by
adoption of the summing network which was exact and was stabilized.
diamond differential circuit is having the structure which constructed the
transistor in the form of the diamond exactly, is being able to take the large
current margin of the drive stage infinitely, and has realized the high-speed
responsibility of the drive stage.
Tone-quality investigation is carried
out by adoption and the diamond differential circuit of the Dual FET of a
low-noise high and gm being used for an equalizer-amplifier part.
Furthermore, DC servo stream composition is adopted.
stream composition of one-side-channel 14 stone FET and the power-source scheme
push pull input/output only for right-and-left independent is used for MC head
The large-sized EI transformer is adopted as power
amplification stages for large-sized toroidal-transformer and voltage amplification stages, and it has become a power-source part with the power
stage, predrive stage, flat amplifier / equalizer, and MC head amplifier
right-and-left full independence scheme 8 power-source stream composition.
Flux freelancers, such as a copper plating chassis, NM element, a wood
bonnet, and a copper plating screw, are put into practice.
||Master integrated DC amplifier
|Effective output (10Hz - 20kHz)
|THD (at the time of 10Hz - 20kHz, and an
||0.004% or less (8ohms)
|Output bandwidth (IHF, both channel operation)
||5Hz - 100kHz (8ohms)
|Frequency characteristic (1W)
||Phono MC high: 85 microvolts/30 ohms
Phono MC low: 270 microvolts/100 ohms
|Maximum permissible input
|RIAA deflection (man month, rec out)
|A high filter
||16Hz (-3dB, 6 dB/oct)
|Power dissipation (Electrical Appliance and
Material Control Law)
||Width 515x height 197x depth of 450mm