Pioneer SM-803
¥ 36,500 (around 1965)
Commentary
A bulb-type pre-main amplifier equipped with a full-scale equalizer amplifier.
Equipped with an equalizer amplifier, you can directly receive the output from a crystal, magnetic or tape head.
For the output stage, a new type power tube 7189A was adopted as a push-pull fixed vise system.
The power supply uses a silicon diode for voltage doubler rectification, and the head uses a selenium rectifier for DC ignition.
CR type is used for the tone control part.
Equipped with low / high filter and loudness control.
Model Rating
| Type | Pre-main amplifier |
| Circuit system | 7189A AB class push-pull fixed bias system |
| Output | Strain-free continuous : 28W + 28W Max : 36W + 36W Music power : 40W + 40W (IHF) |
| Frequency characteristic | 5 Hz to 100 kHz ± 1 dB |
| Residual noise | 0.5 μ W or less |
| Input terminal (input voltage required for undistorted output, 1 kHz) |
Mag:3mV Cer/X'tal:20mV Tape-head:2mV Mic:3mV Tuner, Aux : 150 mv Tape playback:200mV |
| SN ratio (IHF, 1 kHz) | Mag : 60 dB or more Aux : 80 dB or more |
| Equalizer | MAG : NF Type RIAA Tape-head : NF type NARTB |
| Tone control | CR Type, Bass/Treble |
| Low/High Filter | ON/OFF enabled |
| Loudness control | ON/OFF enabled |
| Output terminal | For Speakers (8 Ω -16 Ω Switching Type) Headphone jack (switch type for switching between speakers) Tape rec (for simultaneous recording of tapes) |
| Used vacuum tubes, etc. | 9 balls 3 stones configuration 12AX7x3 6AN8x2 7189Ax4 SE-05bx2 Bridge Type Selenium x1 |
| Power supply voltage | 100 VAC / 117 V (Switching Type), 50Hz/60Hz |
| Power consumption | 180 VA (max) |
| External dimensions | Width 390x Height 148x Depth 340 mm |
| Weight | 13.0kg |