IC-FET-Solid State AM/FM Stereo Receiver
A delectable treat for the sagacious sound connoisseur; the ineffable TK-140X
Kenwood's superior sensitivity and astonishing selectivity starts with 3 FET's 4-gang tuning condenser, 4 ICs IF circuit super sensitive front-end. Sensitivity of the TK-140X is a remarkable 1,7 microvolt - but even more important is Kenwood's selectivity, especially in major metropolitan areas. Where there are two FM stations on the same frequency, a mere 1 dB difference is all that is necessary for the TK-140X to capture one station and utterly reject the other.
The abundant power - 200 watts - of the TK-140X permits you to drive the least efficient speaker systems with ample power to spare, (in fact, the Kenwood TK-140X gives you two sets of stereo speaker outputs, plus stereo headphone jack.)
But most important is the way the TK-140X reproduces music. Every delicate little tone, every subtle note, every nuance of the original sound is clean, pure, crisp and transparent.
New Luminous-Dial
The dial of the Kenwood TK-140X is new. Even the large tuning meter with stereo indicator is new. When the set is on, the dial illuminates in a beautiful blue hue, with every FM and AM frequency clearly visible. Turn the set off, and all the numbers disappear leaving an elegant opaque decorator panel.
200 Watts Undistorted Music Power
Kenwood invites comparison of the TK-140X's power amplifier output characteristics against those of any other stereo tuner-amplifier. The figures should speak for themselves in the TK-140X's favor. It delivers 200 watts in music power at 4 Ω ; 170 watts at 8 Ω , IHF standard. Also in terms of continuous power: 80watts/80 watts at 4 ohms; 60 watts/60 watts at 8 ohms. Distortion factor at rated output; less than 0,5%. Power bandwidth: 15 Hz to 30,000 Hz. These superior specifications are the result of special complementary Darlington circuits and heavy duty silicon transistors, both in its driver and power amplifiers. These silicon transistors also assure long lasting, excellent performance.
FET, Supersensitive Front End
The TK-140X boasts an FM Front End that also vies comparison with the most expensive FM Tuners. Take the 3 FET used in two stages of RF amplification, and the Mixer. Also the 4-gang variable capacitor, and stable oscilator, (Frequency drift within 0,015% over temperature variations between -10 to 50 Centigrade). They all add up to a super-sensitive, distortion-free FM front end with selectivity characteristics that are hard to beat. Sensitivity (IHF): 1,7 µV. Image Rejection, Cross Modulation, IF Rejection; all better than 100 dB. Alternate Channel Selectivity: 45 dB. T.H.D. less than 0,5% at 400 Hz, 100% modulated signal.
The TK-140X has an FM antenna coupling transformer which provides perfect matching at its 75 Ω. Input for single wire or coaxial cable antenna leading, or at its 300 Ω . Input for parallel feeder lines. This eliminates any possibility of line-to-tuner coupling losses due to impedance mismatch.
New Integrated Circuits
Use of new , high-gain Integrated Circuits (IC) in all 4 IF Amplifiers has permitted the TK-140X's Limiter Circuit to react to extremely minute input voltages. This has LED to the exceptional Signal-to-Noise Ratio of better than 65 dB and an FM Capture Ratio of 1,0 dB. This means that where there are two FM stations on the same frequency, a mere 1 dB difference is all that's necessary to capture one station and utterly reject the other.
Specifications
Amplifier Section
Total Music Power (IHF): 200 watts at 4 Ω ; 170 watts at 8 Ω
Continuous Power (IHF)
Each Channel Driven : 80/80 watts at 4 Ω ; 60/60 watts at 8 Ω
Both Channel Driven : 53/53 watts at 8 Ω
Total Harmonic Distortion : less than 0,5% at rated output
Intermodulation Distortion : less than 0,5% at rated output (less than 0,2% at -3 dB rated output)
Frequency Response:
Main Input : 8 Hz to 120,000 Hz ±1,5 dB
Aux Input : 20 Hz to 30,000 Hz ±1,5 dB
Power bandwidth (IHF): 15 Hz to 30,000 Hz
Channel Separation: better than 50 dB
Input Sensitivity (for rated output)
MAG : 2,0 mV
Tape HD : 2,2 mV
Aux : 160 mV
Tape Play (Pin) : 160 mV
Tape Play (DIN) : 160 mV
Main : 100 mV
Recording Output: 160 mV (Pin); 32 mV (DIN)
Maximum Input Signal (at mag Input): 180 mV (p-p 1,000 Hz)
Hum and Noise (below rated output):
Phono Mag : 65 dB
Tape HD : 63 dB
Aux : 75 dB
Tape Play : 75 dB
Noise at minimum volume control : less than 1,5 mV at 8 Ω or 0,28 micro watts (83 dB)
Damping Factor: 28 at 8 Ω (Output impedance of speaker terminal is 0,286 Ω )
Speaker Impedance: 4, 8 and 16 ohms
Controls
Bass : ±10 dB at 100 Hz
Treble ; ±10 at 10,000 Hz
High Filter ; 3,000 Hz cut-off
Low Filter ; 200 Hz cut-off
Loudness Control: +6 dB at 100 Hz, +2 dB at 10 kHz ( at -30 dB)
Output Switch: Power off, A speaker, B speaker, A+B speakers and Phones
Mode Switch: left, Right, Stereo, Rev., Mono
Selector Switch: AM, FM Auto, Phono, Tape HD & Aux
Keyboard Type Switch: Loudness, tape Monitor, Muting, Low Filter and High Filter
Outputs: 2 pairs of stereo speaker terminals, Center channel output (low level), Pre-amp, output, Tape recording output, headphone jack , AC outlet
FM Tuner Section
Antenna Impedance: 300 Ω balanced, 75 Ω unbalanced
Sensitivity (IHF): 1,7 µV
Total Harmonic Distortion: less than 0,5% 400 Hz 100% mod.
Signal-to-Noise Ratio: better than 65 dB
Capture Ratio: 1,0 dB
Image Rejection: better than 100 dB
Cross Modulation Ratio: better than 100 dB
IF Rejection: better than 100 dB
Selectivity (Alt. Channel): 45 dB
Stereo Separation: better than 35 dB at 1,000 Hz
FM IF Stage: 4 ICs
FM Front End: 3 FETs 4-gang tuning condenser
Inter-Station Muting: keyboard switch
FM Spurious Radiation: less than 34 dB (50 µV)
AM Tuner Section
Sensitivity (IHF): 15 µV at 1,000 kHz
Image Rejection: 90 dB at 1,000 Hz
Selectivity: better than 25 dB
Semiconductors: 4 ICs; 3 FETs; 52 Transistors; 35 Diodes; 5 Thermister
Power Requirements: 100 - 120 V, 220 - 240 V 50/60 Hz
Power Consumption: 250 watts at full power 34 watts at no signal
Dimensions (W x H x D): 16-1/2" x 5-1/2" x 12-1/4"
Weight: 28,5 lbs (net)
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