Pioneer SX-818
¥ 100,000 (released in 1973)
Commentary
Stereo receiver that uses pure complimentary service circuit directly connected to all stages.
The power amplifier section employs a pure complimentary service OCL system directly connected to all stages without using a coupling capacitor. In addition, it employs a two stage differential amplifier and applies a large amount of negative feedback to achieve high stability against temperature changes.
The protection circuit is a combination of a power relay and an electronic circuit with a high detection speed, and protects the power transistor and speakers from unexpected trouble.
This protection circuit is self-resetting and also serves as a power muting to eliminate power-on noise.
The FM front-end section combines a carefully selected dual-gate MOS FET and a four row varicon to obtain high sensitivity and high S/N, while improving interference rejection capability.
All stages of the FM IF section are integrated into an IC, a phase-linear ceramic filter with special attention to phase characteristics is adopted as a selection element, and a dedicated IC is adopted for the FM MPX section to improve reliability.
The AM tuner section consists of a tunable RF amplifier using a 3-row varicon, and an IF section uses an IC or ceramic filter.
The equalizer amplifier is a 3-stage direct-coupled E-E feedback type with low-noise silicon transistors.
The control circuit is an NFB type using a low-noise FET at the first stage.
With the dial light dimmer switch, you can choose between light and dark according to the brightness of the room.
Audio muting, audio muting, pre-power amplifier division, high / low filter, selector indicator, etc.
.JPG)
Model Rating
| Type | FM/AM stereo receiver | ||||||
| FM Tuner Section | |||||||
| Practical sensitivity (IHF) | 1.8 μ V | ||||||
| Capture Ratio (IHF) | 1dB | ||||||
| Effective selectivity (IHF) | 80dB | ||||||
| S/N | 70dB | ||||||
| Image Interference Ratio (82 MHz) | 90 dB or more | ||||||
| IF Interference Ratio (78 MHz) | 100 dB or more | ||||||
| Spurious interference ratio (82 MHz) | 100 dB or more | ||||||
| AM suppression ratio | 55dB | ||||||
| Harmonic distortion factor (100% modulation) | Mono : not more than 0.2% Stereo : not more than 0.4% |
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| Stereo separation | 40 dB or More (1 kHz) 30 dB or More (50 Hz to 10 kHz) |
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| Carrier leak suppression ratio | 65dB | ||||||
| Antenna | 300 ohm balanced 75 Ω Unbalanced Type |
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| Muting | ON-OFF enabled | ||||||
| <AM Tuner Section> | |||||||
| Practical sensitivity (IHF) | 15 μ V 300 μ V/m (bar antenna) |
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| Selectivity | 40dB | ||||||
| S/N | 50dB | ||||||
| Image interference ratio | 65dB | ||||||
| IF interference ratio | 85dB | ||||||
| Antenna | Ferrite bar antenna | ||||||
| Power Amplifier Unit | |||||||
| Circuit system | Pure complimentary service directly connected to all 2-stage differentials | ||||||
| Effective power |
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| Harmonic distortion factor | 0.3% or Less (Effective Output) 0.07% or Less (at 1W output) |
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| Cross modulation distortion factor | 0.3% or Less (Effective Output) 0.07% or Less (at 1W output) |
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| Output Bandwidth (IHF, both channel drives) | 5 Hz ~ 40 kHz (Distortion Factor 0.3%) | ||||||
| Frequency characteristic | 5 Hz to 80 kHz + 0 -1dB | ||||||
| Input Sensitivity / Impedance | 500mV/50k Ω | ||||||
| Output terminal | Speaker : A, B, C, A + B, A + C Headphones : 4 Ω ~ 16 Ω |
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| Damping factor (1 kHz, 8 Ω) | 40 or more | ||||||
| S/N | 95 dB or more (IHF, short circuit, A-network) | ||||||
| Residual noise (8 Ω, pre + power amplifier) | 1 mV or less | ||||||
| Preamplifier Section | |||||||
| Circuit system | Equalizer amplifier : 3-stage direct connection NF type Control Amplifier : First Stage FET NF Type |
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| Input Sensitivity / Impedance | Phono1 : 2.7mV/50k Ω Phono2 : 2.7mV/50k Ω Phono2 mc : 115 μ V/30 Ω (when using the MC input transformer PP-402) Mic : 2.6mV/50k Ω Aux, Tape1, 2, Din : 200mV/100k Ω |
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| Phono maximum allowable input (rms/p-p) | 130mV/360mV | ||||||
| Output Level / Impedance | Tape rec1, 2 : 200 mV Tape rec1 (Din) : 35mV/85k Ω Pre-out : 500mV/300 Ω |
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| Harmonic distortion factor (20 Hz to 20 kHz) | Not more than 0.1% | ||||||
| Frequency characteristic | Phono (RIAA deviation) : 30 Hz to 15 kHz ± 1 dB Mic : 20 Hz to 20 kHz ± 1 dB Aux, Tape : 10 Hz to 40 kHz ± 1 dB |
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| Tone control | Bass : ± 10 dB (100 Hz) Treble : ± 10 dB (10 kHz) |
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| Filter | Low : 60 Hz, 12dB/oct. High : 6 kHz, 12dB/oct. |
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| Loudness contour (at Volume -40dB) | + 10 dB (100 Hz), + 6 dB (10 kHz) | ||||||
| S/N (IHF, short circuit A network) |
Phono : 80 dB or more Mic : 70 dB or more Aux, Tape : 90 dB or more |
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| Muting | -20dB | ||||||
| <General> | |||||||
| Power consumption | 150W (rated) 370W maximum |
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| External dimensions | Width 485x Height 150x Depth 375 mm | ||||||
| Weight | 14.8kg | ||||||