Audio Database

TX 6700 Image
Commentary

A TV/AM/FM stereo tuner with a TV audio receiver in addition to an AM/FM stereo receiver.

TV sound reception is an all-band reception of VHF 1-12ch and UHF 13-62ch.
The center tuning meter operates at the time of reception, so that the best tuning point can be obtained by using the preset fine tuning knob for VHF and the easy fine tuning knob for UHF.

The FM front-end section consists of a high-frequency amplification single-stage circuit that combines an FET with a low noise figure and a frequency linear 3-row varicon.

The IF section uses a dedicated high-integration IC developed by Pioneer, which combines more than 200 elements in total into a single IC. In addition, a phase-linear ceramic filter with excellent phase characteristics is used as the selective element to enhance the interference rejection capability.
In addition, this circuit has a 5-stage limiter that virtually eliminates AM noise.

An IC PLL circuit is used in the MPX section to improve the stability of separation characteristics.

A muting circuit for eliminating inter-station noise during channel selection is combined with a selector.
Muting is turned on for FM-auto and turned off for FM-mono. If you set the FM-auto position, muting also works for VHF and UHF TV sound reception.

A dedicated IC developed by Pioneer is used in the AM tuner section.
This IC has an excellent AGC characteristic that keeps the output constant regardless of whether the input is strong or weak, so that the sound is not distorted even in areas where radio waves are too strong.

Equipped with a multi-function meter that functions as a center tuning meter when receiving FM and TV sound, and as a signal meter when receiving AM signal to indicate signal strength.

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 TV/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 40dB
IF interference ratio 50dB
<TV Tuner Section>
Receiving channel VHF : 1-12ch
UHF : 13 ch to 62 ch
Practical Sensitivity (S/N30dB) VHF : 2.5 μ V
UHF : 2.5 μ V
S/N VHF:60dB
UHF:60dB
Harmonic distortion factor
(100 Hz to 10 kHz)
VHF:0.2%
UHF:0.2%
Frequency characteristic 50 Hz to 10 kHz + 0. 2-0. 5 dB
Image interference ratio VHF:85dB
UHF:65dB
IF interference ratio VHF:90dB
UHF:75dB
Spurious interference ratio VHF:65dB
UHF:65dB
<General>
Output Level / Impedance 600 mv (TV : 400 mv) / 5k Ω
Semiconductor used Transistor : 18
FET : 2
IC : 3
Diode, etc. : 14 Pieces
Power supply voltage 100 VAC, 50Hz/60Hz
Power consumption 13W (rated)
External dimensions Width 350x Height 125x Depth 291 mm
Weight 5.6kg
Sold separately : Wood Case JA-C60 (¥ 4,500)
External dimensions Width 404x Height 167x Depth 276 mm
Weight 2.2kg