The latest
power tubes and push-pull output amplifier combine to give the 1000A a
distortionless output up to 80 watts and maximum music power of 100 watts. The
head amplifier utilizes a transistor circuit for a gain three times larger and
a S/N ratio far superior to conventional tube-type amplifiers. Power bandwidth
range is from 20 to 20,000 Hz and the distortion factor a low 1% at 1khz. A
two-stage noise limiter, muting circuit, advanced switching matrix and stereo indicator help to put the 1000A into
the studio class of stereo equipment.
Features:
The 7591
power tubes operate in class AB, Push-pull )fixed bias) for high fidelity
reproduction. Their combined maximum out put is limited to 100 Watts. Total
harmonic distortion at 1 kHz is 0,8%,and even at very low frequency where it is
extremely difficult to minimize harmonic distortion, the distortion is limited
to not more than 1%. This is quite a feat for a 100 watts amplifier.
Another
remarkable feature is the damping factor of 9,5, a figure which is lower than
that of triode power tubes coupled in P.P.. This is way bass sounds come out
with such clarity.
New 7591
P.P. produces 80 W without distortion
NFB used in
all amplifier circuits, from pre-amplifier to power amplifier. The low
distortion of the power amplifier is meaninglass if the pre-amplifier generates
distortion. This 1000A uses a three-stage
amplifier circuit in its intermediate or control amplifier - unlike
conventional one-stage control amplifiers - and has all its circuits in a
single negative-feedback loop. These make 1000A free from noise and distortion.
Super
precision transistor pre-amplifier eliminates hum and noise.
The
exclusive Sansui four-transistor pre-amplifier, which features a transistor
circuit factor of 4-as compared with conventional 5 dB, eliminates hum and
noise, the enemy of high-fidelity reproduction. The amplifier has a much netter
S/N ratio and a gain three times larger than vacuum tube amplifer.
Highly
sensitive two-stage RF amplifier using two Nuvistors a three gang variable
condenser.
The 1000A
has an extremely compact high gain RF amplifier for FM, which uses two
cascode-coupled, low noise Nuvistor tubes with a three-gang variable condenser.
Therefore
the tuner outperforms conventional single-stage grounded grid RF amplifiers by
10 dB in amplification and assures stable, high-selectivity, high-fidelity
reception.
Double-limiter
shuts out noise.
The 1000A is
equipped with a two-stage noise limiter, which works effectively even where the
field intensity is weak. It reliably eliminates a wide variety of noise such as
annoying ignition sounds and other interferences.
Muting
switch supresses noise during channel selection.
Unlike
conventional EM receivers, which produce loud noise in the absence of input
because their limiters require a certain level of input voltage to perform
their noise-limiting function, the 1000A produces no noise even when not tuned
to any station. This is because it has a built-in "Muting switch"
(squelch circuit) which disconnects the audio amplifier stage automatically
when tuner input drops below a certain level.
Three-dimension
performance possible with center-channel output terminal.
The 1000A
has an output terminal for the center-channel amplifier. Connect it to a
monaural amplifier, and enjoy a three-dimansion effect.
Each channel
can be operated independ ently (equipped with double-knob conrol)
Each channel
has an independent tone control for bass and treble. This makes fine adjustment
possible.
Equipped
with advanced high-performance accessory circuits.
This
amplifier is equipped with various advanced accessory circuits such as loudness
control, low and high filters, tape monitor, presence, and headphone jack.
Amazing
channel separation of 35 dB and more ensured by advanced FM multiplex circuit.
The adoption of the most advanced switching matrix method for the multiplex
circuit has amazingly improved the performance of the 1000A. The amplifier has
a full-fledged AFC, which can be switched off if you like.
The AFC enables you to enjoy a stabilized
reception of FM broadcast for many hours once you have tuned in.
Easy-to-see
FM multiplex stereo indicator
The FM
multiplex stereo indicator actuated helps you tune in FM stereo stations easily
and reliably.
Single-stsge
RF amplifier with three-gang vaiable condenser for AM
The addition
of a single-stage RF amplifier to the AM tuner has improved its sensitivity
remarkably. This makes it particulary useful for DX reception.
Moreover, it
has such an excellent image ratio that no beat is produced between your ststion
and another neighboring station.
Built-in,
high-sensitivity ferrite antenna
The
built-in, high-sensitivity ferrite antenna adds to your listening pleasure by
reducing noise to less than that of conventional tuners.
Specifications:
Audio
Section
Music Power
Output: 100 watts total
RMS Music
Power: 40 + 40 watts
Harmonic
Distortion: 1% at 1 kHz at RMS rated
power
Frequency
Response: 20 - 20,000 Hz ±1 dB
(Over-all)
Frequency
Power Amp Section: 10 - 80,000 Hz ±1 dB
Hum and
Noise (IHFM):
High Level
Input : 90 dB below rated output
Low Level
Input : 70 dB below rated output
Channel
Separation: 55 dB at 1 kHz (phono)
Input
Sensitivity (rated output):
Phono 1
: 0,5 mV (by using extra matching
transformers)
Phono 2
: 1,5 mV
Tape Head
(NAB) : 1,5 mV
Mic : 1,8 mV
Aux 1 : 65 mV
Aux 2 : 110 mV
Damping
Factor: 9,5 at 16 Ω, 1 kHz
Output
Impedance: 8 - 16 Ω
Controls and
Switches:
Bass Control
: 26 dB total variation at 50 Hz
Treble
Control : 21 dB total variation at 10
kHz
Loudness
Control: 50 Hz + 7,5 dB; 10 kHz + 7,5 dB
Volume
Control at -30 dB
Low
Filter: -10 dB at 50 Hz
High
Filter: -11 dB at 10 kHz
Presence
Switch: 6 dB 50 Hz
Mode
Selector Switch:
Stereo
Rev; Stereo Nor; Mono L;
Mono R; mono L + R
Other
Special Features:
Direct Tape
Monitor, Headphone Jack, Center-channel output for connection to a third
amplifier, DIN Connector
FM Section
Frequency
Range: 88 - 108 MHz
Sensitivity: 1,0 µV for 20 dB quieting at 100% mod.; 1,8 µV (IHFM Standard)
FM Stereo
Separation: 35 dB at 1 kHz
FM
Distortion: less than 1%
FM Stereo
Frequency Response: 50 - 15,000 Hz ±1 dB
Other
Special Features:
Muting; Two
Nuvistor cascode front-end; Meter tuning; Double limiter; FM stereo indicator;
Heavy flywheel tuning; Solid state AFC
AM Section
Frequency
Range: 535 - 1605 kHz
IF
Selectivity: 6 kHz, 12 kHz -3 dB
Sensitivity: 5 µV (IHFM standard)
iF
Frequency: 455 kHz
Semiconductors:
Tubes: 2 x
6CW4 (Nuvistor); 3 x 6BA6 9EF-93); 1 x 68E6(EK-90); 2 x 6AU6(EF-94); 3 x
6AQ8(ECC-85); 2 x 12AX7(ECC-83); 1 X 12AU7(ECC-82); 1 x 6BL8; 2 x 6AN8; 4 x
7591
Transitors:
4 x 25B-381
Diodes: 12 x
OA-91; 1 x MA-301; 2 x SD-1B; 1 x TC-02P
Power
Requirements: 100,117, 240 volts 50/60
Hz
Power
Consumption: 180 VA
Dimensions
(W x H x D): 17-7/8" x 5-1/2"
x 14-3/16"
Weight: 44,7 lbs
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