Pioneer TX-70
¥ 39,800 (around 1969)
Commentary
An AM/FM stereo tuner with preset tuning that allows you to select an FM station with push buttons.
It comes with 5 FM mini-dials in addition to the conventional main dial. If you preset it to your favorite station, you can tune it just by pressing the button.
Up to 6 stations can be preset.
FET is used for the FM front-end to improve the image ratio and sensitivity.
Two ICs are used for mid-wave amplification to improve selectivity and S/N ratio.
It is equipped with a noise filter that is effective for FM stereo, an FM muting circuit that cuts out inter-station noise when detuning, a level control that can change the output terminal, and a Rec terminal that enables direct tape recording.
Model Rating
Type | AM/FM stereo tuner |
FM tuner circuit system | 1 FET, 3 varactor, RF amplifier 1 stage Tuner with preset by varactor method Two ICs are used for the IF part. FM antenna input 300 Ω balanced type |
Receiving band | FM : 76 MHz to 90 MHz AM : 535 kHz to 1,605 kHz |
Sensitivity (IHF) | FM : 2.2 μ V AM : 10 μ V |
Capture ratio | 1.8 dB (82 MHz, IHF) |
Image ratio | FM : 60 dB (82 MHz, IHF) |
Effective selectivity | 35 dB (± 400 kHz) |
Signal-to-noise ratio | 62dB(IHF) 52 dB (30% modulation) |
Distortion factor | 1% (60 dB input, 400 Hz, 100% modulation) |
Output voltage | 50 mv ~ 500 mv (400 Hz, 300% modulation, controllable) |
Accessory circuit | FM muting circuit Automatic switching between FM mono and stereo MPX Noise Filter AM ferrite bar antenna Signal strength meter FM stereo indicator lamp FM-AFC Tape Rec connector |
Power supply voltage | 100 VAC, 50Hz/60Hz |
Power consumption | 11VA |
External dimensions | Width 370x Height 118x Depth 337 mm |
Weight | 5.6kg |