Pioneer SMT-804
¥ 57,500 (around 1965)
Commentary
Stereo pre-main amplifier with all-transistor configuration.
A SEPP-OTL circuit is used for the circuit system, and a mesa silicon transistor is used for the output stage.
It is equipped with functions such as tone control, low / high filter and loudness control.
An electronic protective circuit using a relay is used for the protective circuit.
The power supply employs a bridge rectification system using a silicon diode.
Model Rating
| Type | Pre-main amplifier |
| Circuit system | Single Ended Push-Pull (SEPP) -OTL system |
| Rated output | 40W + 40W (16 Ω) 27W + 27W (8 Ω) |
| Music Power (IHF) | 45W + 45W (16 Ω) 30W + 30W (8 Ω) |
| Frequency characteristic | 10 Hz ~ 70 kHz ± 1 dB (Main Amplifier Output 500 mW) |
| Input sensitivity (input required for rated output) | Tape head:1.5mV MAG:2.5mV X'tal:70mV Tuner, Aux, and Tape playback : 250 mv Mic:2.5mV |
| Signal-to-noise ratio (Volume Max, Tone Control Flat, IHF) |
Tape head:55dB Aux:62dB |
| Equalizer | Tape head:NARTB MAG:RIAA |
| Tone control | Bass, Treble |
| Filter | Low filter and High filter |
| Loudness control | ON/OFF enabled |
| Output terminal | For Speaker : 8 Ω ~ 16 Ω (With Phase Selection Switch) Stereo headphone jack Tape rec DIN standard tape recorder and reconnector |
| Residual noise | 1.5 μ W or less |
| Protection circuit | Six transistor configuration, relay, reset lamp |
| Semiconductors used | Transistor 25 pcs 2SD45x4 2SB347x2 2SB345x2 2SB379x2 2SB54x6 2SB283x2 2SC147x2 2SB129x2 2SB55x2 2SB26x1 Diode, thermistor 10 pcs SE-1.5ax4 D-1Bx4 D-2Bx2 |
| Power supply voltage | 100 VAC / 117 V (Switching Type), 50Hz/60Hz |
| Power consumption | 220W maximum 59W (no signal) |
| External dimensions | Width 390x Height 137x Depth 354 mm |
| Weight | 13kg |