Pioneer SA-520

Commentary

An authentic pre-main amplifier designed for ease of use.

All stages of the power amplifier are connected to a semi-power complimentary service system. The first stage is equipped with an operation amplifier and an input bias compensation circuit to achieve high DC stability.

The equalizer amplifier is a 2-stage direct-coupled system that combines a low-noise transistor with a low-noise resistor and a styrofoam capacitor to improve S/N and stability.

CR-type tone control has been adopted, and in pursuit of component accuracy, the tone control knob has obtained characteristics with less waviness in the frequency characteristics in the flat position.

Model Rating

Type	Stereo pre-main amplifier
Power Amplifier Unit
Circuit system	Semi-direct complimentary service for all 1st stage
Effective power	Single-channel drive, 1 kHz 20W/20W (4 Ω) 16W/16W (8 Ω) Both channel drive 1kHz: 15W + 15W (4 Ω) 13W + 13W (8 Ω) 20 Hz to 20 kHz : 10W + 10W (8 Ω)
Harmonic distortion factor	Effective power : 0.8% or less 0.2% or less at 1W output
Cross modulation distortion factor	Effective power : 0.8% or less 0.4% or less at 1W output
Output bandwidth	10 Hz ~ 40 kHz (IHF, double-channel drive, 0.8% distortion factor)
Output terminal	Speaker : A, B, A + B (4 Ω ~ 16 Ω) Headphone : 4 Ω ~ 16 Ω
Damping factor (1 kHz, 8 Ω)	30 or more
Residual noise (8 Ω, pre + power amplifier)	1 mV (0.13 μ W) or less
Preamplifier Section
Circuit system	Equalizer amplifier : 2-stage direct connection NFB type Control Amplifier : CR Type
Input Sensitivity / Impedance	Phono : 2.5mV/50k Ω Tuner, AUX1, 2, Tape Monitor1, 2 (DIN) : 150mV/100k Ω
Phono maximum allowable input (rms/P-P)	100mV/280mV
Output Level / Impedance	Tape Rec:150mV Tape Rec (DIN) : 30mV/80k Ω
Frequency characteristic	Phono (RIAA deviation) : 30 Hz to 15 kHz ± 0.5 dB Tuner, AUX, Tape Mon : 15 Hz to 30 kHz ± 1 dB
Tone control	Bass : + 12 dB ~ -10dB (100 Hz) Treble : + 9.5 dB ~ -10.5 dB (10 kHz)
Loudness contour at volume -40dB	+ 10 dB (100 Hz), + 6 dB (10 kHz)
Signal-to-noise ratio (IHF, short circuit A network)	Phono : 70 dB or more Tuner, AUX, Tape Mon : 90 dB or higher
<General>
Semiconductor used	Transistor : 22 Diode : 6 pcs
Power supply voltage	100 VAC, 50Hz/60Hz
Power outlet	Power switch interlock : 1 system Power switch not linked : 2 systems
Power consumption	Rating : 42W Maximum : 85W
External dimensions	Width 415x Height 132x Depth 328 mm
Weight	7.1kg