Pioneer
belives in music. And when a Pioneer product like the SA-7500 integrated stereo
pre/main amplifier reaches the production stage after months of refinement, you
can be sure it stresses musicality above all else. Handling creative musical
information requires as much or more precision as is needed in today's most sophisticated measuring apparatus and
communications systems. This is why Pioneer is not siply an expert in modern
electronics but a respected high fidelity audio specialist as well.
The SA-7500
bears this out. It has all the latest circuits and facilities, including a
precision phono equalizer and extra-versatile tone control section. And it has
a higher power rating than most pre-main models in its class. Continuous power
output of 40 watts per channel, min. RMS at 8 ohms from 20 Hz to 20 kHz with
no more than 0,3% total harmonic
distortion. Yet feature for feature, it's priced less than most of the
competition.
Features
Power
Amplifier - The SA-7500 employs high reliability NPN and PNP silicon power
transistors. Together with the differential first stage, all stages are direct
coupled in a pure complementary OCL circuit configuration. Careful circuit
design and selection of components results in a wide output bandwidth.
Precision
Tone Control Functions - Conventional
Bass and Treble controls are each provided with Turn Over switches for
selecting the frequencies at which the controls take effect. A convenient Tone
switch is also included which permits a flat frequency response to be obtained
regardless of the tone control settings.
Close RIAA
Equalization - RIAA deviation, which governs record playback fidelity, is
reduced to very close tolerance by strinently selected equalizer elements. A
dual DC power supply system is also employed to provide increased acceptable
input volume, resulting in expanded dynamic range and faithful record
performance at low distortion.
Protection
Circuit - Electronic circuitryand a relay are combined in a fast action
protection circuit which guards transistors and speakers from damage in the
event of defective connections, such as speaker terminal shorting. When DC
current appears in the output, the output circuit is instantly opened. The
protection circuit also performs a muting function when the power switch is
operated.
Specifications
Power
Amplifier Section
Circuitry: 1-stage differential amplifiers - Direct
coupled OCL
Power Output
(20 - 20,000 Hz with no more tha 0,3%THD):
40
watts per channel min. RMS at 8 Ω
45
watts per channel at 4 Ω
Continuous
Power Output (at 1,000 Hz Both channel driven):
45
watts per channel at 8 Ω
50
watts per channel at 4 Ω
Total
Harmonic Distortion (at 20 Hz - 20,000 Hz):
Continuous
Rated Power Output : no more than 0,3%
20
watts per channel Power Output, 8 Ω
: no more than 0,05%
1 watt
per channel Power Output, 8 Ω : no more than 0,05%
Intermodulation
Distortion (at 20 Hz - 20,000 Hz ):
Continuous
Rated Power Output : no more than 0,3%
20
watts per channel Power Output, 8 Ω
: no more than 0,05%
1 watt
per channel Power Output, 8 Ω : no more than 0,05%
Frequency
Response: 10 Hz to 80,000 Hz +0 -1 dB
Input
Sensitivity/Impedance
Power
Amp In : 1 V/50 k Ω
Outputs:
Speaker
: A, B, A + B
Headphone :
Low impedance
Damping
Factor (20 Hz - 20,000 Hz, 8 Ω): 25
Hum and
Noise (IHF, Short-circuited A Network):
100 dB
Preamplifier
Section
Circuitry:
Equalizer
Amplifier : 3-stage direct-coupled
amplifier
Control
Amplifier : 2-stage direct-coupled with 1 FET NFB type
Input
Sensitivity/Impedance:
Phono
1 : 2,5 mV/50 k Ω
Phono
2 : 2,5 mV/50 k Ω
Mic
" 7,5 mV/85 k Ω
Tuner
: 150 mV/50 k Ω
Aux
: 150 mV/50 k Ω
Tape
PB 1 : 150 mV/50 k Ω
Tape
PB 2 (DIN connector) : 150 mV/50 k Ω
Phono
Overload level (THD 0,1%)
Phono 1
: 200 mV (1,000 Hz)
Phono 2
: 200 mV (1,000 Hz)
Output Level
Impedance:
Tape rec 1
: 150 mV
Tape
rec 2 (DIN connector) : 30 mV/80 k Ω
Pre
Out : 1 V/1 k Ω
Total
harmonic Distortion (at 20 Hz - 20,000 Hz):
no more tha 0,05%
Frequency
response:
Phono (RIAA
standard): 30 Hz - 15,000 Hz ±0,3 dB
Tuner, Aux,
Tape PB : 10 Hz - 50,000 Hz +0 -1 dB
Tone Control
Bass : ±7 dB (100 Hz)/ ±11 dB (100 Hz); Turnover
Frequency 200 Hz / 400 Hz
Treble
: ±7 dB (10 kHz)/ ±11 dB (10 kHz),
Turnover Frequency 5 kHz / 2,5 kHz
Filter:
Low : 30 Hz (6 dB/oct)
High : 8 kHz 96 dB/oct)
Loudness
Contour (volume control set at -40 position):
+8,5 dB at
100 Hz
+4 dB at 10
kHz
Hum and
Noise (IHF, Short-circuited, A Network):
Phono 1, 2
: 70 dB
Mic : 65 dB
Tuner, Aux,
Tape PB : 90 dB
Muting: 0, -20 dB
Semiconductors:
FETs : 2
Transistors
: 35
Diodes
: 21
Miscellaneous
Power
Requirements: 110 -120 V / 220 -240 V
50/60 Hz
Power
Consumption: 200 watts (at 110-120 v AC)
Dimensions
(W x H x D): 420 x 150 x 345 mm
(16-9/16' x 5-7/8" x 13-9/16")
Weight
(net): 12 kg (26 lb, 7 oz)