Pioneer SA-70

Commentary

Solid state pre-main amplifier using silicon transistor.

The head amplifier uses 3-stage direct-coupled E-E feedback using low-noise silicon transistors.
A low-noise FET is used in the first stage of the preamplifier to improve S/N.

The preamp and power amplifier can be used separately, and the center channel output terminal is mounted on the output stage.

It uses a 3-dB-step switch for tone control and features such as audio muting.

Equipped with two Phono inputs, one of which can be MM type and the other can be MM/MC switching.

Model Rating

Type	Stereo pre-main amplifier
Music power (0.5% distortion rate, 1 khz, IHF)	120W (4 Ω) 85W (8 Ω)
Continuous Rated Output (0.5% Distortion Rate, 1 kHz, Both Channel Operation)	31W + 31W (4 Ω) 27W + 27W (8 Ω)
Effective output (0.5% distortion rate, 1 kHz, single-channel operation)	32W/32W (8 Ω)
Frequency characteristic	AUX : 20 Hz ~ 40 kHz ± 1 dB
Output Bandwidth (0.5% Constant Distortion Factor, IHF)	15 Hz to 60 kHz
Signal-to-noise ratio (Volume Max, Tone Midpoint Effective power, IHF)	Phono MM:85dB AUX:100dB
Distortion factor	0.05% or Less (Output 20W, 1 kHz)
Input Sensitivity / Impedance	Phono 1, 2 (MM) : 3mV/43k Ω Phono 2 (MC) : 0.12mV/110 Ω Tuner, Tape Monitor, AUX : 200mV/220k Ω Main Input : 500mV/170k Ω
Damping factor	40 or More (8 Ω, 1 kHz)
Output terminal	Speaker terminal : 4 Ω ~ 16 Ω Headphone jack Tape-Rec terminal for simultaneous tape recording DIN standard TAPE recorder / reconnector Preamplifier output (Pre Out, 3 v) Center Channel Output (Center Out, 1 v)
Equalizer	Phono MAG : NFB Type RIAA
Residual noise (volume minimum, tone mid-point)	0.7 mv or Less (8 Ω)
Attachment mechanism	Tone control Filter Loudness contour Audio muting (-20dB) AC outlet (2 interlocked systems, 1 non-interlocked system)
Power supply voltage	100 VAC, 50Hz/60Hz
Power consumption	No signal : 25 VA Maximum : 190 VA
External dimensions	Width 370x Height 118x Depth 314 mm
Weight	7.7kg