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| Nakamichi SR-40 |
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| 148,000yen(around the 1987 time) |
FM / AM-stereo receiver which carries a STASIS
circuitry.
The STASIS circuitry is carried in the amplifier part.
This circuitry can transmit an input signal to a speaker by non-distortion
as a matter of fact by pure Class-A operation, and also gives the large-current
supply capacity of AB class to the current amplification stage, and is
controlling the speaker.
Moreover, the preamplifier part made the difference
input the input stage of an equalizer amplifier and line amplifier, and also is
aiming at thoroughness of pure signal transmission, such as making sy copy power
part of line amplifier a perfect discrete stream composition.
In order
to prevent the cross interferencee between internal circuitry, each part of
video-system amplifier, a tuner, and a display device is carefully arranged with
not having an ill effect on an audio circuitry.
The multi-regurated
power supply which separated the powering for every amplifier / stage, and the
isorated grand scheme which eliminated the interference involving an earth line are used for a power-source part.
The 2 steps of Wide/Narrow change of
IF band is possible for a tuner part.
Moreover, the ten-game memory of AM
and the FM can be carried out at random. The description of memory is held for
about five years, also where a power source is extracted with a lithium cell.
The OFC (oxygen free high conductivity copper) pattern of 70micro
thickness is pulled to the substrate of an audio part, and front adoption of the
OFC line is carried out also at product-line material.
Moreover, dumping
material is stuck on the chassis and volume by aluminum extrusion, and the
vibration proof structure is investigated, such as filling up the interior of a
volume thumb with brass.
The input terminal for video equipments is
carried.
The variable loudness control functionality in which the
natural loudness effect is acquired is carried.
As for the general scheme
which emphasizes low-pass and a high region at the time of a small sound volume,
this is giving the loudness effect by narrowing down the level of a mid range
conversely, lowering the whole sound volume.
The processor loop
input/output terminal is carried.
The Phono input carries both the
positions of MC/man month, and a two-step change is possible for MC gain.
Since a volume corresponds also to the coordination from wireless remote
control, it has adopted the motor drive scheme.
The music signal carries
the Subsonic Filter by the simulated inductor scheme which does not pass along
operational amplifier.
The tone control which can be turned on and off
is carried.
The audio mute as for which an Output voltage is made to
1/10 is carried.
An auto seek and a manual tuning can be switched by
one-touch.
AM loop antenna which can be detached and attached is
carried.
The protection circuitry which protects a circuitry and a
speaker from a leakage and unusual exothermic of a direct current component is
carried.
The wireless remote control in which on/off of a power source, a volume coordination, tuning of a tuner, the call of program memory, and an
audio mute are possible is attached.
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| Form |
Stereo receiver |
| <Amplifier part>
|
| Output power |
75W+75W (6ohm)
60W+60W (8ohm) |
| THD |
0.1% or less (8 ohms, an Output power, 20Hz
- 20kHz) |
| Frequency characteristic |
5Hz-75kHz+0 -3 dB |
| S/N ratio (IHF A-WTD, SP out, input
short-circuit) |
Phono MC: 73dB or more (gain 32dB, 1W)
72dB or more (gain 24dB, 1W)
Phono man month: 80dB or more (1W)
compact disk, vide, tape: 105dB or more (Output power) |
| Input sensitivity/impedance |
Phono MC: 60 microvolts/100 ohms (gain 32dB)
160 microvolts/100 ohms (gain 24dB)
Phono man month: 2.5mV / 47kohm
compact disk, video, tape:200mV /, 20kohm |
| <FM tuner part>
|
| Practical speed |
11 dBf/0.97 microvolt (75ohm) |
| S/N ratio (85dBf input) |
mono: 85dB or more
stereo: 80dB or more
|
| Frequency characteristic |
20Hz-15kHz±1dB |
| THD (1kHz, wide) |
mono: 0.05% or less
stereo: 0.07% or
less |
| Effective selectivity |
wide: 55dB or more (±400kHz)
narrow:
70dB or more (±300kHz) |
| Stereo separation |
wide: 50dB or more (1kHz) |
| <Synthesis>
|
| Power source |
100V, 50Hz/60Hz |
| Power consumption |
380W (maxima) |
| Dimensions |
Width 430x height 100x depth of 370mm
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| Weight |
About 10kg |
| Adjunct |
Wireless remote control |
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