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-6500 II

High-Performance Phono Equalizer: RIAA Equalization ±0,3 dB
When you play improved phonograph records your amplifier must be able to handle a high input level or suffer a degree of unpleasant distortion. The SA-6500 II employs a high input voltage-resistant IC in the phono equalizer section in order to avoid distortion. Its split power supply system (plus 21V, minus 19 V) steps up the very large margin of Phono input level to 200 mV (1khz, T.H.D. 0,1%) at input sensitivity of 2,5 mV. The result of this solid-stste sophistication is unquestionably dependable performance. You hear all the dynamics and nuances of the most highly engineered records with the least possible distortion. Deviation from the RIAA equalization curve is only ±0,3 dB

Low-Distortion Power Amplifier - Bass Fequencies Sweet and Clean
The many refinements in the SA-6500 II include a constant-current load construction in the pre-driver stage of the power amplifier. This helps eliminate a time constant at low frequency so that sound quality remains unmuddied and sweet over the whole audible spectrum. The constant-current load, by activating negative feedback, assures that distortion is held to a minimum. The power transistors thus operate well within their linear limitations for richer sound. Power output is continuous 30 watts per channel, min. RMS at 8 ohms from 20 Hz to 20,000 Hz , with no more than 0,1% total harmonic distortion. Further, this practical power output is protected with a power supply using a large transformer and a pair of 6,800 µF electrolytic capacitors for excellent voltage regulation so that low-range dynamics never suffer power drain.

Power Protection Circuit - No On/Off Noise
Pioneer uses both an electronic circuit with TRIAC (a bi-dirctional triode thyristor) and a fuse circuit in the protection section of the  SA-6500 II. Thus the all-stage direct-coupled power circuit is never endangered by irregularities, and the connected speakers never face the threat of shorts. The protection circuitry also employs three transistors to eliminate the unpleasant power on/off noise.

Tape Monitor/Dubbing for Two Stereo Decks - two tape monitor switches on the front panel give you easy control of two stereo tape decks for recording, monitoring  and dubbing from deck 1 to deck 2.

Tone Control Uses CR Circuitry;  Low-Noise Low-Distortion
The two-transistor (PNP-NPN) tone control sectionof the pioneer SA-6500 II uses select low-noise, low-distortion CR elements to expand dynamic range.
The CR elements permit versatile tonal adjustments so that you can more precisely match the acoustical properties of your listening room, and to allow you to get the most out of your phono cartridge. The bass and Treble controls each have 11 click-stops for convenience. There is a Tone defeat switch which permits you to cancel the tone controls at a touch (to "flat") without changing their settings.

Loudness Contour and Speaker Selector - a loudness contour is provided  to compensate for low-level listening drop-out in human hearing at lower and higher frequencies. The speaker selector switch has Off for headphone listening. A or B or A+B two-pair stereo speaker system selection.'

Amplifier section
Circuitry;  1st stage differential amplifier direct-coupled OCL
Continuous Power Output: 
30 watts per channel, min. RMS at 8 Ω;
30 watts per channel at 4 Ω from 20 - 20,000 Hz with no more than 0,15 T.H.D.
Total Harmonic Distortion (20 -20,000 Hz feom Aux): 
Continuous rated power Output :  no more than 0,1%
1 watt per channel power output, 8 Ω :  no more than 0,05%
15 watts per channel power output 8 Ω :  no more than 0,05%
Intermodulation Distortion (50 Hz : 7,000 Hz = 4 : 1, from Aux):
Continuous rated power Output :  no more than 0,1%
1 watt per channel power output, 8 Ω :  no more than 0,05%
15 watts per channel power output 8 Ω :  no more than 0,05%
Speaker :  A, B, A + B
Headphones :  low impedance
Damping Factor:  30 ( 20 - 20,000 Hz 8 Ω)
Input Sensitivity/Impedance
Phono :  2,5 mV/50 k Ω
Tuner, Aux :  150 mV/50 k Ω
Tape Play 1 and 2 :  150 mV/50 k Ω
Tape Play 2 (DIN) :  150 mV/50 k Ω
Phono Overload level (T.H.D. 0,1%)
Phono :  200 mV 91 kHz)
Output Level/ Impedance
Tape Rec 1 and 2 :  150 mV
Tape Rec 2 (DIN) :  30 mV/80 k Ω
Frequency response
Phono (RIAA equalization) : 20 to 20,000 Hz ±0,3 dB
Tuner, Aux, Tape Play :  10 to 40,000 +0 dB -1 dB
Tone Control
Bass :  +9 dB, -8 dB at 100 Hz
Treble :  +8 dB, -6 dB at 10 kHz
Loudness Contour :  +8 dB (100 Hz); +5 dB (10 kHz)
Hum and Noise (IHF, short-circuited A network):
Phono :  72 dB
Tuner, Aux, Tape Play : 93 dB
Semiconductors:  25 Transistors; 16 Diodes; 2 ICs
Power Requirement:  110, 120, 220, 240 50/60 Hz
Power Consumption;  300 watts (max.)
Dimensions (W x H x D):  380 x 139 x 308 mm (14-31/32" x 5-15/32" x 12-1/8")
Weight (net):  7,6 kg (16 lb 12 oz)a

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