Pioneer tx 1000 brochure

Page 1

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A professional quality stereo AM/ FM tuner with outstanding sensitivity,
low distortion and special design for optimum selectivity.

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i e linear dial scale works
ve .umng meters for pinpoint precision,
V p . V mp mented by multipath terminals and other
7 refined features for perfect reception. Both AM and FM
have separate output level controls. And even without an
amplifier you can still listen to this unit through head-
phones plugged into the headphone jack. The Pioneer
TX4000 puts it all together for convenience and superb rc-
sharp cryslél fillers and [Cs caption. Read on to learn why its the finest component
itlng effect provide unsurpassed cap- of its kind for your stereo money

Page 2

FM FRONT-END SECTION WITH MOS-TYPE FETS

DeSIgned to play a key role in obtaining optimum reception
even in areas of weak signals, the front-end section of the
TX-TOOO proVIdes excellent senSitivity and signal-to-nOise
ratio as well as outstanding image rejection, cross-modula-
tion rejection and spurious Signal rejection. As the number
of FM stations increases, spurious signal rejection becomes
more and more the Important consideration in the choice
of a tuner. The TX-IOOO has been designed to satisfy this
consideration beyond a doubt. The circuitry employs four
gang variable capacitors. In the first stage dual gate MOS-
type FET is used, while the second stage features jUflCIIOH
type FET. Additionally, FETs are also used in the mixing
circuit, which complements the stabilized colpittstype
mixing oscillator. The result of these components is an
image reiection ratio of 90 dB, spurious response of 95 dB
and excellent interference rejection characteristics. The
S/N ratio is also improved, and sensitiVIty is an excellent
1.7/zV. All of these keyfront-end features add up to provide
outstanding FM reception, even in weak signal areas, with
freedom from signal overlap and noise.

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FM IF SI'CTION WITH ICS AND CRYSTAL FILTERS

The FM IF section determines the tuners effective selec-
tivity. If its selectivity is poor, undeSIrable Signals from
adjacent stations on the dial will be picked up, the S/N ratio
will suffer and signals will be distorted. Top tuner per-
formance depends on the quality of the IF section. In the
TX-IOOO, the IF section Circwtry employs four le and a
pair of crystal filters and IC filter, The ICs provide an ex-
cellent limiting effect for stable performance, while the
outstanding selectivity of the crystal filters assures sharp
signal reception. The result is a co tant performance,
unaffected by temperature, humidity or age, and ideal
selectivity characteristics of over 70dB and a 1.5dB capture
ratio

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STABLE FM MPX SECTION

The FM stereo section of the TX-T 000 employs a monolithic
IC composed of a switching Circuit, plus a differential arn-
plifier for crosstalk-reduction. These integrated circuits
assure stable performance plus excellent separation (more
than 40dB) over a very wide frequency range. Other out-
standing performance Characteristics include an excellent
S/N ratio and ultra-low distortion (less than 0.5%). The
transformer is a completely sealed type for superior stability
even in areas of great heat and humidity changes.