Pioneer SA-50
¥ 23,800 (around 1969)
Commentary
Stereo pre-main amplifier of the UA (unit amplifier) series.
The power amplifier section uses a quasi complimentary service SEPP-OTL circuit using silicon transistors.
A low-noise transistor is used in the head amplifier section to reduce distortion and improve S/N.
Model Rating
| Type | Stereo pre-main amplifier |
| Music power (Distortion Factor 0.5% or less, 1 kHz, IHF) |
44W (4 Ω) 36W (8 Ω) |
| Continuous rated output (Distortion Rate 0.5% or Less, 1 kHz, Both Channel Operation) |
12W + 12W (4 Ω) 10W + 10W (8 Ω) |
| Effective output (distortion rate 0.5% or less, 1 kHz) | 13W + 13W (8 Ω) |
| Frequency characteristic | AUX : 20 Hz to 50 kHz ± 1 dB |
| Output Bandwidth (0.5% Constant Distortion Factor, IHF) | 20 Hz to 40 kHz |
| Signal-to-noise ratio (Volume Max, Tone Midpoint Effective power, IHF) |
Phono:75dB AUX:90dB |
| Input Sensitivity / Impedance (1 kHz) | Phono MAG : 2.5mV/47k Ω Tuner, Tape Monitor, AUX1, 2 : 200mV/100k 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 |
| Equalizer | Phono MAG : NFB Type RIAA |
| Residual noise (Volume Min, Tone Midpoint) |
0.7 mv or Less (8 Ω) |
| Attachment mechanism | Tone control Loudness contour AC outlet |
| Power supply method | Double-wave rectification by silicon diode |
| Power supply voltage | 100 VAC, 50Hz/60Hz |
| Power consumption | No signal : 15 VA Maximum : 65 VA |
| External dimensions | Width 330x Height 118x Depth 319 mm |
| Weight | 5.3kg |