Pioneer TX-8800

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
Practical sensitivity	Mono : 4 μ V (S/N50dB) / 1.9 μ V (IHF) Stereo : 50 μ V (S/N50dB)
S/N	mono:73dB stereo:68dB
Harmonic distortion factor	mono: 0.2%(100Hz) 0.2%(1kHz) 0.2%(10kHz) stereo: 0.3%(100Hz) 0.3%(1kHz) 0.6%(10kHz)
Capture ratio	1.0dB
Effective selectivity	80dB(400kHz)
Separation	40 dB or More (1 kHz) 35 dB or More (50 Hz to 10 kHz)
Frequency characteristic	50 Hz to 10 kHz + 0. 2-0. 5 dB 20 Hz to 15 kHz + 0.2 -2.0 dB
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)
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
Semiconductor used	Transistor : 16 FET : 1 IC : 3 Diode, etc. : 8 pcs
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