What is stereo?

There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.

H.H. Scott '59

Pioneer SA-9100 amplifier

The SA-9100 is Pioneer's finest two-channel stereo integrated amplifier. Featuring a wealth of improvements in design, this distinguished amplifier offers more than just great power output, but the professional reliability that is so necessary for undistorted sound in today's advanced systems. Employed throughout all the circuit stages is a plus-minus split-power supply. In all amplifier first-stages is a differential amplifier design used in the equalizer, control amplifier and power amplifier section. The result is extraordinary stable and reliable performance exceeding the characteristics of some of the most expensive amplfiers now available. The equalizer section, for example, has a large input handling capability of 250 mV (RMS) and precise RIAA equalization within ±0,2 dB for true hi-fi sound reproduction. Signal-to-Noise ratio, distortion, and dynamic margin are also greatly improved, and the power amplifier section uses the complementary direct-coupled OCL design to provide a wide frequency response and power bandwith - with automatic electronic protection circuit. Tone control function is also unique, featuring Pioneer's new Twin Tone Control system that uses special sub tone controls plus ordinary main controls for bass and treble adjustment. With this complex arrangement, extremely high and low sound spectrum adjustment is possible - and by combining the main and sub controls, even more precise tone control characteristics may be obtained that reflect the performance of your speaker system or phono cartridge, or even the acoustical properties of your musical listening room. In terms of power, 


Pioneer guarantees a solid 60 watts plus 60 watts (both channels driven at 8 ohms) as the minimum standard output, and stands behind this guarantee with a factory tested data sheet which is included with each SA-9100. this power output is indicated by the continuous power output measurement, with both channels driven at 8 ohms within the all-important 20 - 20,000 Hz sound range. Versatility is top-notch, as one would expect from an amplifier of this price and quality; the SA-9100 handles up to three pairs of speaker systems, two turntables, two tape decks, two microphones,, and two additional auxiliary sound sources. There is also a level set switch that widens the optimum control range for the volume level, with stops at 0 dB, -15 dB and -30 dB. Subsonic filters are provided for both individual pre- and power-amp sections with, 12 dB/oct at 8 Hz. As ana investment in professional quality sound reproduction, the SA-9100 is totally uncompromising. It deliveres more for your money, in keeping with Pioneer's high standards. If is one of the finest high-power amplifiers now being made.




Transistors ;  63

Diodes ;  30

Power Amplifier Section

Circuitry :  2-stage differential amplifiers, direct coupled complementary, OCL

Continuous Power Output

20 Hz - 20 kHz (Both Channel Driven): 

60 + 60 watts at 8 Ω

75 +75 watts at 4 Ω

1 kHz (Both Channel Driven):

65 + 65 watts at 8 Ω

85 + 85 watts at 4 Ω

1 kHz (Each Channel Driven): 

75 / 75 watts at 8 Ω

 100 / 100 watts at 4 Ω

Total Harmonic Distortion: 

less than 01% (Continuous power output)

less than 0,04% (1 watt + 1 watt power output)

Power Bandwidth:  5 Hz to 40 kHz (T.H.D. 0,1%; IHF, both channels driven)

Frequency Response:  7 Hz to 80 kHz +0 -1 dB

Input Sensitivity/Impedance:  500 mV/50 k Ω (power Amp In)


Speaker :  A, B, C A+B, A+C (4 to 16 Ω)

Headphone :  4 to 16 ohms

Damping Factor:  more than 70 (1 kHz, 8 Ω)

Hum and Noise:  more than 95 dB (IHF, short-circuited A network)

Residual Hum and Noise (8 Ω, pre- power-amp):  less than 1 mV (0,13 µ watt) 

Subsonic Filter :  8 Hz 912 dB/oct)

Preamplifier Sectin


Equalizer Amplifier:  1st. Stage differential amplifier; 3-stage direct coupled SEPP NF type

Controll Amplifier:  1st. Stage differential amplifier , 3-stage direct coupled NF type

Input Sensitivity/Impedance

Phono  1 :  2,5 mV/50 k Ω

Phono  2 ;  2,5 mV to 10 mV/ 25, 50 100 k Ω

Phono Overal Level (RMS/p-p):  250 mV / 700 mV (at 1 kHz)

Mic :  2,0 mV/50 k Ω

Tuner :  150 mV/100 k Ω

Aux 1 :  150 mV/100 k Ω

Aux 2 :  150 mV to 1,5 V / 50 k Ω to 100 k Ω

Tape Monitor 1, 2 :  150 mV/100 k Ω

Tape Monitor 2 (DIN) :  150 mV/100 k Ω

Output level/Impedance

Tape rec 1, 2 :  150 mV

Tape rec 2 (DIN) :  30 mV/80 k Ω

Pre Out :  2 V/8 Ω

Total Harmonic Distortion:  less than 0,03% (20 Hz - 20 kHz)

Frequency Response:

Phono RIAA Equalization:  30 Hz - 15,000 Hz ±0,2 dB

Mic ;  10 Hz - 10,000 Hz  +0 -1 dB

Tuner, Aux, tape Mon :  10 Hz - 70,000 Hz  +0 -1 dB

Tone Controls

Bass : 

Main Control :  ±10 dB at 100 Hz

Sub Control :  ±6 dB at 50 Hz


Main Control :  ±10 dB at 10 kHz

Sub Control :  ±6 dB at 20 kHz


Subsonic:  8 Hz (12 dB/oct)

Low :  30 Hz 912 dB/oct)

High :  8 kHz; 12 kHz 912 dB/oct0

Loudness Contour (Volume control set at -40 dB position) :  +10 dB (100 Hz)

Hum and Noise (IHF, short-circuited A network)

Phono :  more than 80 dB

Mic :  more than 70 dB

Tuner, Aux, Tape Mon :  more than 90 dB

Muting:  - 20 dB

Level Set:  0, -15, -30 dB


Power Requirements:  110, 120, 130, 220, 240 V (switchanle) 50/60 Hz

Power Consumption: 430 watts max

AC Outlets:  1 Switched ; 2 Unswitched

Dimensions (W x H x D):  430 x 138 x 341 mm (16-15/16" x 5-7/16" x 13-7/16")

Weight:  13,6 kg (30 lbs)


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