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| Lo-D SR-3100 |
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| 49,800yen(around the 1975 time) |
The AM/FM stereo receiver which collected the
receiver technology of the Lo-D and aimed at the cost cut.
In FM tuner
part, the dual gate MOS FET and triple variable condenser AGC are adopted as
front end.
Moreover, quadrature detection with high high-integrated IC, IF
section of a four-element phase linear ceramics filter, and reliability has
realized the good distortion and the S/N property.
The multi-demodulator
circuit has adopted the double balance type differential switching circuit, and
has obtained the stable separation.
The power amplifier part has adopted
the OCL circuitry of the inverted Darlington scheme of a whole page hardwired
connection using NPN with a sufficient linearity, and a PNP silicon transistor.
IIn order to make an input conversion noise small, the circular transistor
designed by the first rank for low noises is adopted as the equalizer stage
of a preamplifier part. Moreover, since it is "3 steps of ±2 power-source
schemes hardwired-connection stream composition", a nakedness property
is large, and since a lot of NF are applied, the low distortion has been
realized to all the bands.
A mass transistor and zener diode are used for a tuner, an equalizer, and the driver stage, and the voltage fluctuation of AC line and the cross
interferencee between each circuitry inter-block and a channel are suppressed by
supplying by a respectively separate rectifier circuit and constant-voltage
regulated power supply.
The four-element phase linear filter and the
balanced type mixer of high-integrated IC are adopted as AM tuner part.
The mic mixing circuitry and FM muting organization are carried.
|
.JPG)
| Form |
FM/AM receiver |
| <Power amplifier part>
|
| Effective output |
| 1kHz, both ch(es) drive : |
18W+18W (4ohms)
15W+15W (8ohms)
|
| 1kHz, one-side-channel drive : |
22W/22W (4ohms)
19W/19W (8ohms)
|
|
| Dynamic power (IHF) |
45W (8ohms) |
| THD |
0.8% (at the time of an effective output)
0.1% (at the time of 1 / 2 effective output) |
| Cross modulation distortion |
0.8% (at the time of an effective output)
0.1% (at the time of 1W output) |
| Output bandwidth (IHF) |
10Hz - 50kHz |
| Frequency characteristic |
10Hz-30kHz±2dB |
| Dumping factor |
30 (1kHz, 8ohms) or more |
| <Preamplifier part>
|
| Input sensitivity/impedance |
Phono: 2.5mv/50kohm
Aux:
200mV/100kohm
Tape PB: 200mV/35kohm
Mic: 7mV/30kohm
|
| Phono maximum permissible input |
100mV (RMS, 1kHz) |
| Tone control |
Bass: ±10dB (100Hz)
Treble: ±10dB
(10kHz) |
| Loudness control (Volume-30dB) |
+ 9dB (100Hz), +5dB (10kHz)
|
| S/N (IHF, A network, input short-circuit)
|
Phono:65dB
Aux, Tape PB: 70dB
|
| <FM tuner part>
|
| Practical speed (IHF) |
1.9 microvolts |
| Capture ratio |
1.0dB |
| Effective selectivity |
52dB |
| S/N |
67dB |
| THD (400Hz) |
mono:0.3%
stereo:0.6% |
| Separation |
41dB(1kHz) |
| <AM tuner part>
|
| Practical speed (IHF) |
20 microvolts |
| Selectivity |
35dB |
| Image stonewalling ratio |
56dB |
| <Synthesis>
|
| The semiconductor used |
Transistor: 16 pieces
FET: One piece
IC: Five pieces
Diode: 25 pieces |
| Supply voltage |
AC100V, 50Hz/60Hz |
| Power dissipation (Electrical Appliance and
Material Control Law) |
55W |
| Dimensions |
Width 413x height 136x depth of 376mm
|
| Weight |
7.6kg |
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