DENON TU-300Z
¥ 39,800 (around 1973)
Commentary
This FM/AM tuner is based on TU-300 and is designed with the aim of improving the stability and the completeness further.
The front-end section uses high-frequency two stage amplification with two low-noise FETs and four variable capacitor to improve sensitivity and interference rejection capability.
The IF amplifier uses two silicon monolithic ICs and four ceramic filter elements, and achieves two signal selectivity of 70 dB or more and passband characteristics of 3 dB bandwidth of 200 kHz or more.
It employs a newly developed non-backlash tuning system, enabling accurate channel selection without backlash.
The MPX section is equipped with a newly designed LC resonance low-pass filter, which eliminates 19 kHz pilot signal and 38 kHz subcarrier leakage signals that are harmful to the output audio signal.
It is a 2-meter system with signal meter and 0 center tuning meter.
Equipped with FM muting circuit, noise between stations can be reduced.
The AM tuner section uses a ferrite bar antenna to improve sensitivity.
Equipped with a level adjuster, output matching with other equipment is possible.
Model Rating
Type | FM/AM Tuner |
FM Tuner Section | |
Receiving frequency range | 76 MHz to 90 MHz |
Practical sensitivity (IHF) | 2 μ V |
Distortion Factor (1 kHz, 100% Modulation) | mono:0.2% stereo:0.4% |
Signal-to-noise ratio (IHF) | 70 dB or more |
Two signal selectivity (IHF) | 70 dB or more |
Image interference ratio (84 MHz) | 80 dB or more |
AM suppression ratio (IHF) | 60 dB or more |
IF interference ratio | 90 dB or more |
Capture Ratio (IHF) | 1.0 dB or less |
Spurious response | 80 dB or more |
FM stereo separation | 40 db or More (1 kHz) 30 dB or More (100 Hz to 7 kHz) |
Frequency characteristic | 50 Hz ~ 15 kHz + 0 -3dB (with 19 kHz Filter) |
Output Level / Impedance (1k μ V input, 100% modulation) |
Fixed : 1V/2k Ω or less Variable : 0 ~ 1V/2k Ω or less |
<AM Tuner Section> | |
Receiving frequency range | 525 kHz to 1605 kHz |
Practical sensitivity | 200 μ V/m (loop antenna) 30 μ V/m (external antenna used) |
Image interference ratio (1000 kHz) | 55 dB or more |
IF Disturbance Ratio (1000 kHz) | 40 dB or more |
Selectivity (± 20 kHz) | 60 dB or more |
SN ratio (input 50k μ V, 30% modulation) | 50 dB or less |
Distortion factor (input 50k μ V, 30% modulation) | Not more than 0.7% |
Output Level / Impedance (30% Modulation) | Fixed : 0.3V/2k Ω or less Variable : 0 ~ 0.3V/2k Ω or less |
<General> | |
Attachment | Automatic switching between FM mono and stereo Stereo indicator Muting switch High blend switch Signal meter FM center tuning meter Feeder Antenna for FM (300 Ω) 75 Ω connector for FM AM ferrite bar antenna |
Power supply voltage | 100 VAC, 50Hz/60Hz |
Power consumption | 15W |
External dimensions | Width 376x Height 140x Depth 310 mm |
Weight | 6kg |
Attachment | Connection code x1 75 Ω, 1 F-type plug for 3C-2V T-type simple antenna for FM x1 |