|
| SANSUI AU-555A |
|
| 41,800yen(around the 1970 time) |
The Integrated Amplifier of PB series which upgraded
AU-555 and renewed the description and the design.
The whole page consists
of silicon transistors.
The SEPP-ITL-OTL scheme of the pure
complimentary darlington circuit which adopted the silicon transistor as the
power transistor is adopted.
In order that an electrolytic capacitor may
avoid the ill effect which it has on a music signal, as much as possible, using
a hardwired-connection circuitry, a capacitor is lessened, and a required
fraction makes a circuit impedance high and is using the Mylar capacitor.
Moreover, electrolysis connected the Mylar capacitor to the surely required
fraction in parallel, and has improved the high region property.
The
triple tone control of Bass, Midrange, and Treble is carried.
Moreover,
since it is an it1 step type control, a special NetWare program and a more exact
correction of a room acoustic can be performed.
Especially a
preamplifier part uses the low-noise silicon transistor sorted out, and makes
the noise small.
All the amplifying circuits from the first rank to the
final output stage are constituted from NF amplifier, and the frequency
characteristic, distortion, and S/N are improved.
A preamplifier part
and a main-amplifier part are detachable.
The ripple-filter circuitry
which became independent, respectively is attached to the main amplifier and the
preamplifier power source.
A hum component is intercepted completely by this
and the power source is stabilized.
Two speaker outputs are carried.
Functionalities which can be simultaneously monitored at the time of a
low NF type filter, a high filter, a loudness control, and a sound recording,
such as a tapes monitor circuitry and a headphone termination, are carried.
|
| Form |
Stereo Integrated Amplifier
|
| <Main-amplifier part>
|
| Output power |
| Music power (IHF) : |
85W (4ohm)
60W (8ohm) |
| Effective output : |
33/33W (4ohm)
25/25W (8ohm) |
|
| THD |
0.5% or less (Output power)
|
| Cross modulation distortion (SMPTE,
60Hz:7000Hz=4:1) |
0.5% or less (Output power)
|
| Power Band Width (IHF) |
20Hz - 40000Hz (8ohm) |
| Frequency characteristic |
20Hz - 40000Hz, ±1dB |
| Channel separation |
60dB or more (1kHz, Output power)
|
| A hum and a noise (IHF) |
100dB or more |
| Input sensitivity/impedance |
1V (Output power) / 100 kohms or more
|
| Load impedance |
4ohm-16ohm |
| Dumping factor |
50 (8-ohm load intensity) |
| <Preamplifier part>
|
| Output voltage |
Maximum output: 5V
Output power: 1V
|
| THD |
0.1 (Output-power voltage) or less
|
| Frequency characteristic |
20Hz - 30000Hz, ±1dB |
| Channel separation (1kHz, Output power)
|
Phono1, 2:45dB or more
Tuner, AUX: 50dB
or more |
| A hum and a noise (IHF) |
Phono1, 2:70dB or more
Tuner, AUX: 80dB
or more |
| Input sensitivity/impedance (1kHz,
Output-power voltage) |
Phono1, 2:2mV / 50kohm
Tuner: 180mV /
50kohm
AUX: 180mV / 50kohm
Tape Play(Pin): 180mV / 50kohm
Tape
Recorder(Din): 180mV / 50kohm |
| Sound-recording output (1kHz, input voltage)
|
Tape Rec(Pin):180mV
Tape
Recorder(Din):30mV |
| Equalizer |
Phono:RIAA NF type |
| Control |
Bass: 30Hz, ±12dB
Midrange: 1.5kHz, ±5dB
Treble: 15kHz, ±10dB
Loudness: +3dB (10kHz), +8dB (50Hz)
|
| Switchpoint |
A low filter: 50Hz-8dB
A high filter:
10kHz-7dB |
| <Synthesis>
|
| Power source |
100V, 50Hz/60Hz |
| Power consumption |
130W |
| Dimensions |
Width 395x height 127x depth of 278mm
|
| Weight |
8kg |
|
|
|