DENON TU-501
¥ 49,800 (around 1977)
Commentary
FM/AM tuner equipped with drum type long scale dial.
The front end is equipped with 4-series frequency linear variable capacitor, one stage RF, and MOS FET.
The IF amplifier uses a linear phase 6-element ceramic filter and LC circuit to achieve an effective selectivity of 78 dB, and a wide-band Quadrature detection circuit and phase correction circuit to reduce stereo distortion.
In addition, high-gain amplification using high-integration ICs and 5-stage limiters reduce the deterioration of sound quality due to interference.
Large level meters are installed on the left and right sides of the front panel and can be used as both signal meters and to measure the tuner output level and power amplifier output.
The newly developed ICHA 1197 is used in the AM tuner section.
The 2-stage AGC improves sensitivity and prevents output fluctuation due to the strength of the electric field. The ceramic filter improves selectivity, interference rejection capability and audio transmission characteristics.
Model Rating
Type | FM/AM Tuner |
FM Tuner Section | |
Receiving frequency range | 76 MHz to 90 MHz |
Intermediate frequency | 10.7MHz |
Practical sensitivity (IHF) | 1.8 μ V |
S/N50dB sensitivity | Mono : 3.5 μ V |
Effective selectivity (IHF) | 78dB |
Image Interference Ratio (83 mhz) | 90dB |
IF Interference Ratio (83 MHz) | 90dB |
Spurious interference ratio (83 MHz) | 90dB |
AM suppression ratio (IHF) | 60dB |
Capture ratio | 1.2dB |
Frequency characteristic | 30 Hz ~ 15 kHz + 0 -3dB 50 Hz ~ 10 kHz + 0 -0.6 dB |
Carrier leak | 65dB |
Signal-to-noise ratio | mono:75dB stereo:70dB |
Total harmonic distortion rate (1 kHz) | Mono : 0.1% (at 100% modulation) Stereo : 0.15% at 90% modulation |
Stereo separation | 45dB(1kHz) 40 dB (50 Hz to 10 kHz) |
<AM Tuner Section> | |
Receiving frequency range | 525 kHz to 1,605 kHz |
Intermediate frequency | 455kHz |
Practical Sensitivity (S/N 20 db) | 300 μ V/m (using attached bar antenna) 20 μ V (External Antenna Terminal Used) |
Selectivity (± 10 kHz) | 33dB |
Image Interference Ratio (1 MHz) | 55dB |
IF Interference Ratio (1 MHz) | 40dB |
Signal-to-noise ratio | 55 dB (field strength 100mV/m at 30% modulation) |
Total harmonic distortion factor | 0.4% (at an electric field strength of 10mV/m and 30% modulation) |
<Audio Output> | |
Output Voltage / Impedance | 1Vrms/1.5k Ω (at 100% modulation) |
Level check voltage | 0.5 Vrms (440 Hz, equivalent to 50% modulation) |
<level meter> | |
External audio measurement range | + 10, + 20, + 30 dB (0 dB : 0.775 Vrms) |
Indication error | ± 0.2 dB or Less (1 kHz for each range, near VU scale 0) |
Frequency characteristic | 20 Hz to 15 kHz ± 0.5 dB or less |
<General> | |
Antenna terminal | FM : Screw Type (300 Ω, 75 Ω) AM : Ferrite Bar Antenna with Threaded External Terminal |
Pwer | 100 VAC, 50Hz/60Hz |
Power consumption | 10W |
External dimensions | Width 430x Height 145.5x Depth 303 mm |
Weight | 6.6kg |