|
| ROTEL RA-2030 |
|
| 98,000yen( at the 1970 in-the-late time(?)) |
The Integrated Amplifier which adopted DC scheme.
DC scheme is adopted as a power amplifier part.
Dual FET to which
the property was equal is adopted as the first rank of DC power amplifier part, and the pure complimentary OCL circuitry and the conjointly excellent tone
quality are realized. Moreover, about the drift of the middle point potential
which poses a problem with DC amplifier, a power supply variation is suppressed
in each stage, a pair property is raised, and the stability is improved.
Taking advantage of the merit of the tone quality of Class-A amplifier,
AB class operation method which can acquire the Oide power is adopted.
Usually, it is a Class-A operation at the time, and it changes to B class
operation automatically at the time of the Taishin number which needs big power.
The low distortion is realized by investigating thoroughly until it
results in the design of the printed circuit board, or a placement of a
shielding code including a material or component partses.
As a
protection network, the electro carry control ASO (area of safe operation)
circuitry and DC feedback power limit circuitry are carried. The electro carry
control ASO circuitry has protected the transistor and speaker of amplifier by
relay operation. Moreover, the DC feedback power limit circuitry operated
quickly to the overload, and has protected the transistor.
The peek
indicator by light emitting diode is carried. 13 light emitting diodes per
channel were adopted, power was transposed to digital one, and the quick window
is realized.
Since the sensitivity switching (-20dB) organization and the
off-switchpoint are equipped, it reads easily also at the time of a small sound
volume, and the indicator window can also erase an indicator, when unnecessary.
MC head amplifier is carried.
The head amplifier adopted as RA-2030
has adopted the three-step parallel coupled circuitry by low-noise FET as the
input unit.
The two-step DC difference input circuitry by low-noise FET
is adopted as an equalizer-amplifier part, and the property which was excellent
with the stream composition which made the output stage the push pull has been
acquired in it.
A load impedance can also adjust three steps and three steps of additional
capacitance, and man-month cartridge can do nine kinds of combination in
total.
The recording selector is carried and the output
signal to a tape deck can be chosen regardless of the sound which comes out from
a speaker.
DC amplifier scheme is adopted as a tone control circuit.
Moreover, it is possible to cancel a tone circuitry and to also make it operate as flat buffer amplifier with a tone-defeat switchpoint.
The Subsonic
Filter and the supersonic filter are carried.
The termination by which
the gilding treatment was carried out is adopted.
The front panel serves
as EIJ specification rack-mounted type.
|
| Form |
Integrated Amplifier |
| <Power amplifier part>
|
| Output power (both channel drive) |
100 W/ch (4 ohm, 1kHz)
80 W/ch (8 ohm, 20Hz - 20kHz) |
| THD |
0.01% (at the time of an Output power 20Hz -
20kHz) |
| Cross modulation distortion |
0.015% (at the time of an Output power 8ohm) |
| Frequency characteristic (1 W/ch, 8ohms)
|
2Hz-200kHz+0 -3 dB |
| Input sensitivity/impedance |
1V/50kohm |
| Dumping factor (8ohm) |
60 (20Hz - 20kHz)
90(1kHz)
|
| S/N ratio (IHF-A network short-circuit)
|
105dB |
| Crosstalk (10kHz) |
60dB |
| <Equalizer part>
|
| THD |
Phono MAG:0.005%
Phono MC:0.006%
|
| RIAA deflection (20Hz - 20kHz) |
±0.3dB |
| Input sensitivity/impedance |
Phono1 MAG: 2mV / 35, 50, 70kohm/0, 100 or
200pF
Phono2 MAG: 2mV / 50kohm
Phono3 MC: 200 microvolts/150 ohm |
| Maximum permissible input (1kHz, THD0.5%)
|
Phono MAG:300mV
Phono MC:10mV
|
| <Preamplifier part>
|
| THD |
0.008% (at the time of an Output power 20Hz
- 20kHz) |
| Frequency characteristic |
4Hz - 160kHz |
| S/N ratio (IHF-A network) |
Tuner, Aux: 95dB
Tape monitor:95dB
|
| remains noise (at the time of a volume min)
|
6 microvolts, 100dB |
| Input sensitivity/impedance |
Tuner, Aux:150mV /, 50kohm
Tape monitor:
150mV / 50kohm |
| Maximum permissible input (1kHz, THD0.5%)
|
Tuner, Aux:15V
Tape monitor:15V
|
| Slew rate |
30V/muS |
| Square wave rise time |
3microS |
| <Control property>
|
| Control width |
Bass: ±10dB (100Hz)
Treble: ±10dB
(10kHz) |
| Supersonic filter |
24kHz, 12dB / oct |
| Subsonic Filter |
15Hz, 12dB / oct |
| <Synthesis>
|
| Maximum electric power consumption
|
500W |
| Dimensions |
Width 482x height 143x depth of 408mm
|
| Weight |
18kg |
|
|
|