Pioneer TX-8800
¥ 44,500 (around 1975)
Commentary
An AM/FM stereo tuner that inherits the TX 8900 technology and aims for high performance beyond the class.
The front-end section uses a four row frequency linear varicon, and for high-frequency amplification, low-noise, high-linearity FET is used to improve sensitivity and interference rejection capability.
In the IF stage, selectivity characteristics are improved by making the 2-element ceramic filter with excellent phase characteristics into a 3-stage configuration.
The IC incorporates more than 200 elements in total into a single IC, with five stage limiters to adjust the waveform and improve various characteristics.
A PLL circuit is used in the MPX section.
Stable separation is obtained by exclusive high integration IC of the PLL circuit.
A muting circuit using a relay is built in to eliminate noise between stations at the time of detuning.
The AM tuner section uses a two row varicon and high-integration IC to enable stable reception regardless of wave strength. The IF stage uses a ceramic filter to obtain sharp selectivity characteristics.
It is equipped with an MPX noise filter to cancel high-frequency noise that is likely to occur when receiving stereo signals in weak electric power regions.
Equipped with a signal meter.
Equipped with two output terminals, fixed and variable.
It also has multi-path outputs and four chMPX outputs.
The scale faces are lit using the reflect lighting method.
Model Rating
Type | AM/FM stereo tuner | ||||
FM Tuner Section | |||||
Circuit system | FETRF 1-stage, 4-series varicon, 5-stage limiter, quadrature detection PLL MPX |
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Practical sensitivity | Mono : 4 μ V (S/N50dB) / 1.9 μ V (IHF) Stereo : 50 μ V (S/N50dB) |
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S/N | mono:73dB stereo:68dB |
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Harmonic distortion factor |
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Capture ratio | 1.0dB | ||||
Effective selectivity | 80dB(400kHz) | ||||
Separation | 40 dB or More (1 kHz) 35 dB or More (50 Hz to 10 kHz) |
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Frequency characteristic | 50 Hz to 10 kHz + 0. 2-0. 5 dB 20 Hz to 15 kHz + 0.2 -2.0 dB |
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Image interference ratio | 85 dB or more | ||||
IF interference ratio | 90 dB or more | ||||
Spurious interference ratio | 90 dB or more | ||||
AM suppression ratio | 55dB | ||||
Carrier leak suppression ratio | 65dB | ||||
Muting action level | 2.2 μ V | ||||
Antenna | 300 Ω Balanced Type, 75 Ω Unbalanced Type | ||||
<AM Tuner Section> | |||||
Circuit system | Untuned RF1-stage 2-train varicon | ||||
Practical sensitivity | 300 μ V/m (bar antenna) 15 μ V (IHF) |
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Selectivity | 35dB | ||||
S/N | 50dB | ||||
Image interference ratio | 40 dB or more | ||||
IF interference ratio | 55 dB or more | ||||
<General> | |||||
Output Level / Impedance | Fixed : 650mV/5k Ω Variable : 50 mv ~ 1.5V/2.5k Ω 4 ch MPX : 250mV/5k Ω |
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Semiconductor used | Transistor : 16 FET : 1 IC : 3 Diode, etc. : 8 pcs |
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AC outlet | Power switch not linked : 1 system | ||||
Power supply voltage | 100 VAC, 50Hz/60Hz | ||||
Power consumption | 15W (rated) | ||||
External dimensions | Width 420x Height 150x Depth 365 mm | ||||
Weight | 8.0kg |