|
| Lo-D HA-7700 |
|
| 99,000yen(around the 1979 time) |
The power MOS FET loading Integrated Amplifier which
applied the know-how acquired by HMA-9500 to the pre-main.
Switching
speed 0.05microsec, Power MOS FET has attained the frequency characteristic of
1MHz (-2dB) of an amplification factor, and has realized the high-performance of
single or more figures as compared with the conventional bipolar transistor.
This has realized power gain of 85dB in 100kHz of nakedness properties, the
negative feedback stabilized [ 100kHz or ] enough started, and moreover, since
switching speed is quick, the push-pull operation excellent also in B class
circuitry has been realized.
In order to demonstrate the performance of
the power stage to the maximum extent, the simple three-step power circuitry
with few phase changes is adopted.
Furthermore, stability of operation is
raised by having a whole page DC amplifier stream composition.
By
three-step hardwired connection of the interrupt-control-logic circuitry,
current mirror type differential circuit, and SEPP circuit of a cascode
differential, the equalizer-amplifier part has secured 300mV of allowable inputs
to SN ratio Input sensitivity of 2.5mV of 85dB.
Moreover, SN which was
excellent also in head amplifier with a three-step hardwired-connection stream
composition is secured.
The power-source part is stopping the Tran Gent
crosstalk by carrying a right-and-left independent-source transformer and a mass
capacitor.
In order to unite the input of amplifier with the
recommendation load resistance of a cartridge, the Phono multiple contact switch
is carried.
One step of values of the resistor connected to the input of
Phono1 and 2 can be switched by four steps and MC position in man-month
position.
The Subsonic Filter is carried.
|
| Form |
Integrated Amplifier |
| <Main-amplifier part>
|
| Effective output |
70W+70W (8 ohms, both channel drive, 5Hz - 30kHz) |
| THD |
0.008% (at 5Hz - 30kHz, the time of an
Output power 8ohms)
0.02% (at 5Hz - 100kHz, the time of 35W output 8ohms)
|
| Cross modulation distortion (60Hz:7kHz=4:1)
|
0.008% (at the time of an Output power
8ohms)
0.003% (at the time of 35W output 8ohms) |
| Frequency characteristic |
DC-100kHz+0 -1 dB (DC) |
| Input sensitivity/impedance |
Main in: 1V/47kohm |
| SN ratio (IHF, A network) |
115dB |
| Dumping factor |
60 (1kHz, 8ohms) |
| Load impedance |
4ohm-16ohm |
| <Preamplifier part>
|
| Input sensitivity/impedance |
Phono1, 2 man month: 2.5mV/100 ohm,
22kohm, 47kohm, 100kohm
Phono1, 2 MC: 250 microvolts/100 ohms
Tuner, Aux, Tape play1, 2:150mV/47kohm |
| An Output voltage/impedance |
Tape rec out1, 2:150mV/600 ohms
Pre out:
1V/600 ohm |
| Phono maximum permissible input (1kHz,
0.01%) |
MM:300mV
MC:30mV |
| THD (1kHz) |
Phono1, 2 man month: 0.002% or less (AT Rec
out, 1V)
Phono1, 2 MC: 0.01% or less (AT Rec out, 1V)
Tuner, Aux, Tape
play1, 2:0.005% or less (AT Pre out, 1V) |
| Frequency characteristic |
Phono1, 2:20Hz-20kHz±0.2dB (RIAA deflection)
Tuner, Aux, Tape play1, and 2:10Hz-100kHz+0 -2.5 dB |
| SN ratio (IHF, A network) |
Phono1, 2 man month: 86dB
Phono1, 2 MC:
68dB
Tuner, Aux, Tape play1, 2:100dB |
| Tone control |
Bass: ±8dB (100Hz)
Treble: ±8dB (10kHz)
|
| A low filter |
15Hz, 6dB / oct |
| Muting |
-16dB |
| <Others> |
| Supply voltage |
AC100V, 50Hz/60Hz |
Power consumption
(Electrical Appliance and Material Control Law) |
175W |
| AC outlet |
Power-switch interlock: Two lines
Power-switch un-interlocking.: One line |
| Dimensions |
Width 435x height 164.5x depth of 383mm
|
| Weight |
16kg |
|
|
|