Pioneer TX-6300

Commentary

An AM/FM stereo tuner designed for high sensitivity, high selectivity and stability at low cost.

The front-end section uses a high-frequency single-stage amplifier circuit that combines an FET with a low noise figure and a frequency number line type 3-row varicon to improve sensitivity and interference rejection.

The IF section uses Pioneer's original IC that combines more than 200 elements in total into a single IC, and the selection element uses a phase linear ceramic filter with excellent phase characteristics.
In this circuit, the waveform is well shaped by the 5-stage limiter, and noise of AM component is also removed.

The MPX section has an IC dedicated to the PLL circuit.
The PLL detects the phase difference between the two signals so that the demodulation signal and the pilot signal generated in the MPX are always in phase with each other, and controls the demodulation signal correctly. This improves the stability of the separation characteristics of the MPX section.

It has a built-in muting circuit to cut off noise at the time of detuning and noise between stations.

A dedicated IC is used in the AM tuner section.
This IC has an excellent AGC characteristic that ensures constant operation regardless of the strength of the input, ensuring stable sound quality even in high-electric-field regions.

Equipped with a lever switch that combines a selector switch and a muting circuit.
FM-mono is combined with muting off, FM-auto is combined with muting on, and AM is selected independently.

Equipped with a center tuning meter.
When AM is received, this meter acts as a signal meter to indicate the strength of the input.

The walnut finished wood case that can be used commonly for TX-6300, SA-6300, TX-6700, and SA-6700 was sold separately.

Model Rating

Type	AM/FM stereo tuner
FM Tuner Section
Circuit system	FETRF 1-stage, 3-series varicon, 5-stage limiter, quadrature detection, PLL MPX
Practical sensitivity	Mono : 4.5 μ V (S/N50dB) / 1.9 μ V (IHF) Stereo : 50 μ V (S/N50dB)
S/N	mono:70dB stereo:68dB
Harmonic distortion factor	mono: 0.2%(100Hz) 0.2%(1kHz) 0.2%(10kHz) stereo: 0.4%(100Hz) 0.4%(1kHz) 0.6%(10kHz)
Capture ratio	1.0dB
Effective selectivity	60dB
Separation	35 dB or More (1 kHz) 30 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	60 dB or more
IF interference ratio	90 dB or more
Spurious interference ratio	75 dB or more
AM suppression ratio	50dB
Carrier leak suppression ratio	40dB
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	50 dB or more
<General>
Output Level / Impedance	750mV/5k Ω
Semiconductor used	Transistor : 5 pcs FET : 1 IC : 3 Diode, etc. : 6 pcs
Power supply voltage	100 VAC, 50Hz/60Hz
Power consumption	12W (rated)
External dimensions	Width 350x Height 125x Depth 303 mm
Weight	4.4kg
Sold separately : Wood Case JA-C60 (¥ 4,500)
External dimensions	Width 404x Height 167x Depth 276 mm
Weight	2.2kg