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| Lo-D HCA-9000 |
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| 200,000yen(one-set, around the 1979 time) |
The preamplifier of the tone-quality first-priority
design which selected carefully the component partses which minimize the number
of circuitries and constitute each of the circuitry block by the repetition of
the careful audition.
Efficient and the toroidal transformer of low
leakage flux are adopted as a power-source part.
Moreover, as a NF form, the
constant-voltage electric current lowered source impedance, and has adopted the
six-line independent power-feeding scheme which uses 1 set of constant-voltage
regulated power supplies for all the amplifier respectively. Furthermore, a mass
capacitor and the metallized polyesters film capacitor which was excellent in
tone quality are connected to the output side in parallel, and the tone quality
is raised.
The improvement in the quality of all the component partses
is measured, and attention is paid to the selection of how to use a capacitor
also especially in it, or a kind.
The styrene capacitor of 500V resisting pressure is used for the capacitor
for phase compensations. In the circuitry where especially [ in tone quality
] a degree of incidence is high, a two-piece series was used and it arranges.
The electrolytic capacitor was made a
metallized polyester film capacitor and flat amplifier in the two-piece back two
back at the equalizer circuitry RIAA element, and the metallized polycarbonate
film capacitor is adopted as a using and a power source.
The circuitry
of HCA-9000 consists of MC head amplifier, an equalizer amplifier, and flat
amplifier.
The interrupt control logic DC stream composition which has
neither a coupling capacitor nor a mass capacitor of a feedback circuit in an
input is adopted as these circuitries.
The differential circuit to which
MC head amplifier part carried out 4 parallel connection of the high gm low
noise FET to the first rank, the differential circuit in which the following
stage has a current mirror circuitry, and the last stage have adopted the
three-step stream composition of the SEPP output stage by a pure complimentary.
Furthermore, an input impedance is switched to a two-step so that MC
cartridge of a very low impedance may also be matched.
The equalizer
circuitry impressed the voltage of ±42V and has acquired the outstanding
property by using of the linearity beyond maximum output 20V, the metals skin
membrane resistance of a ±1% error, and the capacitor selected carefully in tone
quality etc.
The coupling capacitor which examined the property enough
is used for a flat amplifier part.
The Phono selector of front operation
type is carried and the change of MC and man month is possible in the front
panel.
Output is attaining low-power-output impedance-ization.
The off-position is established in the tapes monitor switchpoint.
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.JPG)
| Form |
Preamplifier |
| Circuit system |
MC head amplifier: interrupt control logic
DC stream composition
Equalizer amplifier: interrupt control logic DC
stream-composition NF type
Flat amplifier: interrupt control logic DC stream
composition |
| Input sensitivity/impedance |
Phono1, 2 man month: 2.5mV/100 ohm,
22kohm, 47kohm, 100kohm
100pF, 200pF, 300pF, 400pF
Phono1, 2 MC:
0.25mV/30ohm, 100ohm
Tuner, Aux, Tape1, 2:150mV/47kohm |
| An Output voltage/impedance |
Rec out: 150mV/600 ohms (V or more [ A
maximum of 20 ])
Output: 1V (V or more [ A maximum of 20 ]) / 30ohms
(0--40dB) |
Phono maximum permissible input
(1kHz,
RMS, THD0.01%) |
Phono1, 2 man month: 350mV
Phono1, 2 MC:
35mV |
| THD (20Hz - 20kHz) |
| Phono1, 2 man month : |
0.005% or less (AT Rec out SFT Level 1V)
0.005% or less (AT Rec out SFT Level 4V) |
| Phono1, 2 MC : |
0.01% or less (AT Rec out SFT Level 1V)
0.005% or less (AT Rec out SFT Level 4V) |
| Tuner, Aux : |
0.005% or less (AT Output SFT Level 1V)
0.003% or less (AT Output SFT Level 4V)
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| Frequency characteristic |
Phono1, 2:RIAA±0.2dB (20Hz - 20kHz)
Tuner, Aux, Tape1, and 2:5Hz-100kHz+0 -1 dB |
| SN ratio (IHF, A network) |
Phono1, 2 man month: 90dB (AT Input SFT
Level 2.5mV)
Phono1, 2 MC: 76dB (AT Input SFT Level 0.25mV)
Tuner, Aux,
Tape1, 2:100dB (AT Input SFT Level 150mV) |
| Filter barrier property (only Phono input)
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15Hz, 6dB / oct |
| Cross modulation distortion (60Hz:7kHz=4:1)
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0.002% or less (AT Output SFT Level 7V)
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| Remains noise |
5 microvolts or less |
| The semiconductor used |
Transistor: 81 pieces
FET: 24 pieces
Diode: 61 pieces |
| Supply voltage |
AC100V, 50Hz/60Hz |
| Power consumption |
45W |
| AC outlet |
Power-switch interlock: Two lines, max150W
Power-switch un-interlocking.: Two lines, max400W |
| Dimensions |
Width 435x height 80x depth of 377mm
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| Weight |
8.4kg |
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