Pioneer SX-90
¥ 80,000 (around 1970)
Commentary
A total stereo amplifier developed in pursuit of higher quality by IC and best-in-class power.
The FM front-end section is composed of a low-noise FET and a four link varicon.
The IF and MPX circuits are integrated into highly reliable ICs.
The tuner meters are equipped with a signal strength meter and a center tuning meter to enable more accurate tuning.
Equipped with a Low/High filter.
Equipped with Route 3 speaker outputs and center channel outputs.
It has a mixing circuit that can mix a microphone with other sources.
In consideration of upgrading to a multi-amplifier system, the pre-part and main part can be separated.
.JPG)
Model Rating
| Solid-state integrated stereo amplifier | |
| Tuner Section | |
| Receiving sensitivity | FM : 1.8 μ V AM : 10 μ V (IHF) |
| Receiving band | FM : 76 MHz to 90 MHz AM : 535 kHz to 1,605 kHz |
| Capture Ratio (IHF) | 0.7dB(82MHz) |
| Antenna input | FM : 300 Ω balanced |
| Circuit type (FM) | Double-tuned front-end with high-frequency amplification using FET and 4-series varicon Multi-circuit with 4-IC IF amplification, ratio detection, monolithic IC |
| Accessory circuit | Signal strength meter for AM/FM common use Center tuning meter Stereo indicator Muting switch SCA Filters Ferrite antenna |
| Amplifier Unit | |
| Circuit system | SEPP-OTL, quasi complimentary service circuit |
| Music power | 145W (8 ω, 0.5% Distortion, IHF) |
| Continuous Rated Output (Both Channel Operation) | 38W + 38W (8 Ω) |
| Output bandwidth | 15 Hz ~ 40 kHz (Constant Distortion Rate 0.5%, IHF) |
| Input Sensitivity / Impedance | Phono MAG : 2.7mV/50k Ω Phono Xtal/CER : 60mV/100k Ω MIC : 3.2mV/30k Ω Tape Monitor : 200mV/100k Ω Main in : 480mv/80k Ω |
| Signal-to-noise ratio | MAG:80dB Aux : 100 dB or more |
| Output terminal | Speaker jacks : Route 3 (A, B, C switchable), 4 Ω ~ 16 Ω Stereo headphone jack Tape rec connector Pre out:480mV Center Channel Output Terminal : 500 mv DIN standard recording and re-connector |
| Accessory circuit | Tone Controls (Bass, Treble) Low/High Filter Loudness contour Microphone mixing Premain split switch |
| <General> | |
| Semiconductor used | Transistor : 41 FET : 1 IC : 5 Diode : 19 units |
| Power supply voltage | 100 VAC, 50Hz/60Hz |
| Power consumption | 250VA |
| External dimensions | Width 459x Height 145x Depth 369 mm |
| Weight | 11.4kg |