It doesn't take much
shopping around to make the discovery that most stereo receivers these days
look pretty much alike, with the tuning dials dominating the frontface, with
knobs and controls often adding to the clutter. Now comes Pioneer to make a
major new contribution to the aesthetics of receiver design. And make a break
from the concept of the traditional receiver. The SX-D5000 is totally
redesigned. All controls Iexcept Volume and Balance) and switches are sliders
and pushbuttons, not levers, rockers or rotary knobs. Indications are all
digital, even the one for tuned frequency. You don't have to be a stereo expert
to see how these new lines and contours add up to a distinctive kind of
elegance. To see how the SX-D5000 gives the appearance of a precision
transceiver, with all controls neatly grouped into three.
Visually attractive,
functional, operationally comfortable - a rare combination of design qualities
in a receiver. Would you expect less from Pioneer?
The SX-D5000 is what
receivers should be like in the 1980s. Once again, Pioneer makes the first
impression.
Too Hot to Handle
The traditional
alternative to the Class-B amp is Class-A. The former amp employs the on-off
switching of transistors in order to minimize heat loss. In Class-A, a large
amount of bias (or idle current) is applied to keep the transistors ON at all
times, whether or not a signal is present for amplification. This avoids
switching distortion. However, as much as 75% of the energy consumed is bled
off in the form of heat, adding up to waste, potential damage and inefficiency.
Attempts to create a hybrid "A/B" and other alternatives have always
ended in frustration.
Pioneer Vari-Bias to
the Rescue.
Frustration,
however, is often the mother ofinvention.Not so long ago our engineers began to
work on what they call :a very imple high-speed bias servo" to increase
Class-A efficiency. An inspired breakthrough led to the Pioneer Vari-Bias
circuit, which constantly monitors the amplitude of incoming signal, then
automatically controls the amount of bias fed to the power transistors.
While they
"rest" during no-signal periods they get only a trickle - just enough
to keep them from switching off. Actually, this circuit isso simple it does not
limit the transient response of the transistors in any way .
DC with a Difference
Still another
advantage of the SX-D5000's power amp is its special DC or Direct Current
configuration. What makes it special is the coupling capacitors we've used at
the input of the amp to safeguard the circuits and your speaker systems. If
this precaution is not taken, ultra-low-frequency signals which might be picked
up, say, from a warped record can cause
annoying "Doppler distortion" in drivers, adversely modulating the
audible frequencies. Pioneer's DC (with a Difference) however, removes
signal-delaying capacitors from the negative feedback loops to reduce phase
distortion. This contributes immensely to sharp and densely-textured sonic
imagery in the final reproduction.
Power Amp Highlights
Continuous Power
Output is 80 watts per channel, min. At 8 ohms from 20 to 20,000 hertz with no
more than 0,005% total harmonic distortion.
Heat Sink - is the
"I-Skived" type, which uses thinly-sliced metal fins on a lightweight
but solid frame to provide as much as 50% better heat dissipation than in
conventional types.
Protection Circuitry
- has gold-plated dual-contact relays for fast response and unfailing
dependability should power-related mishaps occur. The receiver and your
speakers are fully protected; the circuitry mutes power on/off noise, protects
power transistors and speakers from abnormal direct-current potentials and
overload at the output.
Accurate Preamp and
Versatile Control
Fluroscan power
Output Meter
For added accuracy,
we've chosen the Pioneer-exclusive Fluroscanmeter instead of the needle-type
analog types. For superior readability, the bar-graph sections of each channel
have 12 separate fluorescent segments each. They thus achieve a large and clearly-calibrated
display that is easier to read than ordinary VU-type meters. Range is 0,01 to
80 watts, referred to an 8- ohm speaker load.
Low-Noise Phono
Equalizer
Two low-distortion
monolithic Ics are used, one in each channel, in the phono equalizer to provide
exceptionally good signal-to-noise ratio (82dB). Given this circuit design with
its precise construction, RIAA equalization is achieved accurately within ±0,2dB
over the 20 to 20,000 Hz range with never more than 0,005% THD. Phono overload
is 200 mV, permitting you to use high-output cartridges if you desire.
Low-Distortion Tone
Control Amp
This is also an
IC-built circuit block, employing NFB to lower distortion to 0,005% or less (4V
output) over the 20 to 20,000 Hz range. Bass and Treble adjustments are made on
the two slider controls - each with 11 click stops - so they never ad audible distortion
to your music.
When the controls
are centered at the "0" positions, the tone amp is defeated entirely
and you get a flat response at the output.
Attenuator-Type
Master Volume Control
We've improved the
"feel" of the master volume control by providing it with decibel
calibrations from 0 down to -7 dB. You know at a glance how much power your
receiver is delivering on the average, which should be reflected on the
Fluroscan power metwr. For operating convenience, the control has 41 detents or
click stops.
Preamp/Control
Highlights
Function Indicators
(FM/AM/Aux/Phono) - Pioneer's
"Light Touch" buttons are employed to indicate the selected function.
The buttons are lit and glow green when engaged.
Speakers (A/B) -
switches with LED indicators
Low (Subsonic)
Filter - 18 Hz with -6 dB/octave curve
Tape Monitor&
Duplicate - switches for decks 1 and 2; deck-to-deck dubbing is easily
accomplished between the two in either direction
Loudness, Balance,
Mode (Stereo/Mono) and Muting (-20 dB) controls.
Adaptor - switch to
patch in a signal processor unit such as a graphic equalizer, dynamic processor
or reverberation unit.
Pre/Power Amp
Separation - is possible bia jumpers on blck panel, still another rare receiver
feature of the SX-D5000.
Drift is Banished by
Pioneer's Quartz-PLL Synthesizer
Quartz-PLL is a Gem
Two problems you may
be familiar with in your own stereo system: Hiss-ridden, distortion-marred
reception from your favorite stations. And "drift - along with incidental
noise and distortion - that puts a perfectly tuned station out of tune as heat inside
a receiver builds up. These are the problems that the design of the SX-D5000,
and its Quartz-PLL synthesizer, avoids.
The front end of the
SX-D5000 uses a gem-loke quartz crystal as the most accurate and dependable
controller of the local-oscillator
frequency yet devised. It's so accurate that it's used in transmitters at
broadcasting stations. The steady frequency derived from the quartz crystal is
compared with the desired station frequency via a PLL thousands of times per
second. Drift simply cannot develop. Tuning is always accurate and precise.
Reliable performance
is enhanced by a combination of the superior qualites of quartz with the
astonishing capabilites of two microelectric C-MOS LSIs, one to provide
frequency synthesis and the other to make possible Autoscan, Memory and
"last Call"
Electronic Varicape
for Ganged Tuning Capacitor
In the SX-D5000 a
team of varicaps for FM and AM is used instaed of the conventional mechanically
ganged variable capacitors. Because they work purely electronically,
degradation of basic specifications - even over long periods of time - does not
occur. Varicaps provide both the desired tuning capacity of conventional
capacitors and the extra advantage of being able to control preset fixed
voltages commanded by special Ics at will. This means you can preset your
favorite stations and tune them in without scanning the entire FM or AM dial -
at the touch of a button.
The use of an FET as
teh RF amp means still higher sensitivity, better rejection of interference and
improved resistance to overload in any area.
FM IF with Special
Filters
The front end signal
goes in what's called the IF section for amplification and removal of noise. In
this section we've used three special 2-pole ceramic filters with flat
group-delay response to assure still lower distortion.
Integrated Circuits
Made to Pioneer's Specifications
Two
Pioneer-exclusive Ics are employed in the IF and MPX demodulator sections of
the SX-D5000 for reliability and dependability. One (PA-3007A) serves as an FM
IF amp/detector. It improves the signal-to-noise ratio, lessens distortion and
eliminates "TV buzzes". The 82dB signal-to-noise ratio of this unit
is rare.
The other IC is
called PA-4006A and it contains a PLL stereo demodulator. It makes FM stereo
listening cleaner and more accurate. The
PA-4006A also doubles as automatic pilot signal canceller, eliminating the 19
kHz "switching" signal and ensuring that the audio output is never
compromised; even if the modulation percentage of the transmitter changes (as
it often does when you tune to a relayed, not main, transmission), the
canceller tracks the change.
New Air-core
Quadrature Disciminator
Pionner's new-type
quadrature discriminator is a combination of an air-core micro-inductor and a
detection transformer in a single pack. Benefits include a higher
signal-to-noise ratio, wider channel
separation,wider frquency response and a more natural tonal quality. These
qualites are enhanced by the use of a separate low-pass filter, one in each
channel at the output of the PLL stereo demodulator.
Pushbutton Station
Selection and Other Tuning Conveniences
Autoscan for
On-Target Tuning at a Touch
Once the FM function
button is pressed, simply tiuch the UP (or Down) button and the digital
synthesizer begins to scan the FM frequency band in 100 kHz steps at high
speed, searching for the nearest station of acceptable strength. Once a strong
station signal is located, scanning stops and the station's frequency is
"locked". If this is not the station you desire, simply repeat the
process until you find it. When scanning reaches either end of the frequency
band, it automatically "retraces." All in All, simple on-target
tuning, push-button simple.
Naturally, when the
AM function is selected, you get the same automatic convenience. Scan intervals
are 1 kHz for Am station selection.
Manual Scan for
Added Convenience
Manual Scan is
another Pioneer feature you'll quickly come to appreciate. Setting the
Auto/Manual Tuning switch to Manual gives you two "submodes" - two
different speeds depending on the degree of pressure you apply to the Up or
Down buttons. The two speeds are:
Step Tuning : A
light touch on either button moves you up or down the tuning dial in steps (100
kHz for FM and 1 kHz for AM). This mode is used for sampling each and every
scan interval.
Rapid Tuning : As
you continue to press one of the buttons, the frequency band is scanned from
end to end at high speed. You use this mode to move rapidly from one band area
to another.
Memory - An
Unforgettable Convenience
Electronic accuracy
pays off in yet another feature in the SX-D5000, a handy Memory facility for FM
and AM. To preset a station, you simply select it with one of the station call
button numbered up to six. And you can repeat the process for up to six programmed
stations for both FM and AM. Station recall is at the touch of a button.
You can unplug the
SX-D5000 for up to about three days without losing the preset stations. Back-up
circuitry, not batteries, makes this possible.
Fluroscan Digital
Tuned-Frequency Readout
Whatever FM station
you've tuned, its frequency is shown in five digits on the Pioneer Fluroscan
display, one of the most accurate frequency readout displays ever developed.
One immediately appreciable advantage over conventional needle-type pointers is
that Fluroscan is not subject to parallax, the optical illusion that plagues
needle-type pointers.
The SX-D5000
features a five-digit display. Resolution extends to 100 kHz for FM
Fluroscan
Tuning/Signal Indicators
So that you can find
the desired FM station quickly and accurately even during Manual Scan, we have
provided easy-to-read tuning/signal indicators on the Fluroscan panel face.
Observe the simple Tuning indicator; the blue bar light when you are right on station
(±30 kHz).
The Signal Strength
meter on the Fluroscan panel just below the Tuning meter works both for FM and
AM. It has five separate "steps" and operates from an elaborate
circuit using two special Ics.Together, these precision-built aids enhance the
SX-D5000's tuning accuracy for both FM and AM.
"Last
Call" Tuning Aid
"Last
Call" means that the frequency of the last station you tune before you
turn the receiver off is kept intact until you re-power the tuner. This is an
important feature for persons who make unattended recordings off the air.
Tuner Highlights
AM Stereo output for
future adaptor is provided: output is 450 kHz, buffered.
FM/AM Muting;
inter-station noise is hardly audible while you tune an FM or AM station.
Muting for AM is a feature rare in receivers today.
LED Indicators for
station call buttons
Ball-Joint AM Bar
Antenna; swivles to almost any degree for better AM reception.
25µS Dolby
De-Emphasis Switch; with an appropriate Dolby decoder conected to the SX-D5000,
you can enjoy hiss-free Dolbyized broadcasts immediately.
Specifications
Continuous Power
Output: 80 watts per channel, min. At 8
ohms from 20 to 20,000 Hz with no more than 0,005% THD
Total Harmonic
Distortion:
No more than 0,005%
(continuous rated power output)
No more than 0,004%
(40 watts per channel power output)
Intermodulation
Distortion (50 Hz : 7,000 kHz = 4:1):
No more than 0,005%
(continuous rated power output)
No more than 0,004%
(40 watts per channel power output)
Frequency
Response: 3 to 450,000 Hz +0 dB, -3 dB
Input
Sensitivity/Impedance: 1V/50 kΩ (Power amp In)
Output:
Speaker : A, B, A
+B, OFF
Headphones : Low
impedance
Damping
Factor: 60 (20 to 20,000 Hz, 8Ω)
Hum and Noise (short
circuited, A network): 115 dB
Pre-amp Section
Input
Sensitivity/Impedance
Phono
: 2,5 mV/50 kΩ
Aux,
Tape 1 & 2, Adaptor In: 150 mV/50 kΩ
Phono Overload
Level: 200 mV(1 kHz, THD 0,005%)
Output
level/Impedance:
Tape Rec 1 & 2,
Adaptor Out: 150 mV
Pre
Output: 1V/1kΩ
Total Harmonic
Distortion: No more than 0,005% (20 to
20,000Hz, 4V output)
Frequency Response
Phono (RIAA
Equalization): 20 to 20,000 Hz, ±0,2 dB
Aux, Tape 1 &2,
Adaptor: 5 to 100,000 Hz, +1,0 dB, -3,0 dB
Tone Control
Bass : ±8 dB (100
Hz)
Treble : ±8 dB (10
kHz)
Filter
Low (Subsonic) : 18
Hz (6 dB/oct)
Loudness Contour
(volume control set at -40dB) : +6 dB
(100 Hz), +3 dB (10 kHz)
Hum and Noises
(Short-circuitedm A network)
Phono : 82 dB
Tuner, Aux, Tape 1
& 2, Adaptor: 100 dB
Muting : -20 dB
FM Tuner Section
Usable
Sensitivity: 10,2 dBf (1,8 µV); (Mono)
50 dB Quieting
Sensitivity:
Mono : 15,7 dBf (3,2
µV)
Stereo : 34,2 dBf
(28,2 µV)
Signal-to-Noise
Ratio (at 85 dBf):
Mono : 82 dB
Stereo : 78 dB
Distortion (at 65
dB)
100 Hz : 0,1%
(mono); 0,2% (stereo)
1 kHz : 0,07%
(mono); 0,1% (stereo)
6 kHz : 0,1% (mono);
0,2% (stereo)
Frequency Response:
30 to 15,000 Hz ±0,5 dB
Capture Ratio: 1,0 dB
Alternate Channel
Selectivity: 80 dB (400 kHz)
Spurious Response
Ratio: 80 dB
Image Response
Ratio: 80 dB
IF Response
Ratio: 90 dB
AM Suppression
Ratio: 60 dB
Muting
Threshold: 35,7 dBf (32 µV)
Stereo
Separation: 50 dB (1 kHz), 35 dB (30 Hz
to 15 kHz)
Subcarrier
Ratio: 65 dB
SCA Rejection
Ratio: 65 dB
Antenna
Input: 300 Ω balanced; 75 Ω unbalanced
AM Tuner Section
Sensitivity: 300 µV/m (IHF, ferrite antenna); 15 µV (IHF, external antenna)
Selectivity: 30 dB
Signal-to-Noise
ratio: 45 dB
Image Response
Ratio: 30 dB
IF Response
Ratio: 60 dB
Antenna: Ferriote loopstick antenna
Semiconductors: 11 FETs; 24 ICs; 98 transistors; 100 Diodes
General
Power
Requirement: 120 V, 60 Hz ; 220 V, 50/60 Hz
Power
Consumption: 250 W
Dimensions (W x H x
D): 499 x 173 x 460 mm (19-5/8" x
6-13/16" x 18-1/8")
Weight: 16,2 kg (35 lbs) without package
