DENON TU-920

Commentary

An FM/AM tuner that uses a digital synthesizer.

It employs a quartz-lock synthesizer system that synchronizes with the accuracy of the crystal oscillation. The comparison frequency of the PLL is set to 25 kHz, which is out of the audible band. It also employs a static control system that suppresses noise from the frequency display circuit. This improves the SN ratio by eliminating beat and noise in the audio band.

Equipped with a one touch random preset tuning function that can directly call up 8 stations without switching between FM and AM.
It is equipped with four channel selection methods, including automatic channel selection that automatically finds and tunes radio waves by auto-scan, manual channel selection that can receive even weak radio waves by manual scan, and last-channel memory channel selection that calls the station before OFF when the power is ON.

The front end section of the analog type uses a varactor diode equivalent to four circuits, and the input section uses a dual gate MOS FET.
The IF stage, which controls the total quality, uses a ceramic filter with constant amplitude and constant delay characteristics, and an anti-noise filter to eliminate Birdie generated during stereo operation. This improves the interference rejection capability.

It is equipped with a quality indicator that shows a good level of reception.

The AM tuner uses a 3-terminal high-selectivity ceramic filter and coil that eliminates 9 kHz beat interference and a low-impedance loop antenna that is resistant to electric field noise.

There are 2 variations, black and champagne gold.

Model Rating

Type	FM/AM Tuner
FM Tuner Section
Receiving frequency	76 MHz to 90 MHz
Antenna terminal	75 Ω (Terminal Type)
Practical sensitivity	0.9 μ V/10.3 dBf
S/N50dB sensitivity	Stereo : 21.5 μ V/37.9 dBf Mono : 1.8 μ V/16.4 dBf
Image interference ratio	80dB
IF interference ratio	90dB
AM suppression ratio	60dB
Effective selectivity	65 dB (± 400 kHz)
Capture ratio	1.0dB
Frequency characteristic	20 Hz to 15 kHz + 0.2 -1.6 dB
Signal-to-noise ratio (weight A)	stereo:80dB mono:84dB
Total harmonic distortion rate (1 kHz)	Stereo : 0.08% at 90% modulation Mono : 0.05% (at 100% modulation)
Stereo separation	50dB(1kHz)
Output level	0.6 v (at 100% modulation)
<AM Tuner Section>
Receiving frequency	522 to 1,611 kHz
Antenna	Terminal type with loop antenna
Practical Sensitivity (S/N20dB)	18 μ V
Selectivity	50 dB (± 9 kHz)
Image ratio	45dB
Signal-to-noise ratio	55dB
Total harmonic distortion factor	0.3%(1kHz)
Output level	0.2 V at 30% modulation
<General>
Pwer	100 VAC, 50Hz/60Hz
Power consumption	8W
External dimensions (including knob, leg and terminal)	Width 434x Height 66x Depth 281 mm
Weight	3.3kg