DENON TUA-400
¥ 55,800 (around 1973)
Commentary
Stereo receiver equipped with microphone mixing function.
The TUA 400 has a built-in microphone mixing circuit that allows you to mix the microphone input with sound from an external source.
Specially selected PNP-NPN genuine complimentary service circuit is adopted for the amplifier part.
The equalizer circuit consists of three elements using low-noise PNP-NPN transistors.
A low-noise silicon transistor and FET are used in the front end of the FM tuner to improve sensitivity so that stable reception can be achieved even in areas with weak electric field strength.
The IF stage employs a four stage configuration combining two ceramic filters and an IC, providing excellent effective selectivity and interference rejection capability.
It is equipped with an electronic FM mono-stereo automatic switching function. If the selector is set to FM-AUTO, stereo reception is automatically performed.
The preamplifier section and power amplifier section can be used independently.
Equipped with an audio muting circuit, the volume can be reduced by approximately 20 dB with one touch operation.
.jpg)
.jpg)
Model Rating
| Type | Stereo receiver |
| FM Tuner Section | |
| Antenna terminal | 300 Ω balanced, 75 Ω unbalanced |
| Sensitivity | 2.5 μ V (IHF) |
| Image interference ratio | 60dB |
| IF interference ratio | 110dB |
| Spurious response | 90dB |
| AM suppression ratio | 45 dB or more |
| Capture ratio | 2 dB or less |
| Selectivity | 65 dB or more |
| Signal-to-noise ratio | 65 dB or more |
| Stereo separation | 35dB(1kHz) |
| Distortion Factor (400 Hz, 100% Modulation) | Mono : 0.5% or less Stereo : not more than 1.0% |
| <AM Tuner Section> | |
| Antenna terminal | Built-in bar antenna With External Antenna Terminal |
| Sensitivity | 200 μ V (when bar antenna is used) |
| Image interference ratio | 60dB |
| IF interference ratio | 40dB |
| Selectivity | 36 dB or More (± 10 kHz) |
| Amplifier Unit | |
| Music power | 45W(IHF) |
| Rated output | 19W/19W (8 Ω, single-channel drive) 17W + 17W (8 Ω, when driving both channels) |
| Output terminal | Pre-out : 250mV/150 Ω Rec out : 100mV/10k Ω Rec/PB : 30mV/70k Ω Headphone : 8 Ω Speaker : 8 Ω |
| Harmonic distortion factor | 0.05% (at 10W output) |
| Input terminal | Phono : 2mV/50k Ω Mic : 3.3mV/50k Ω Aux : 150mV/100k Ω Tape PB : 300mV/130k Ω |
| Phono maximum allowable input | 130mV(1kHz) |
| Output Bandwidth (IHF) | 30 Hz to 50 kHz ± 3 dB |
| Frequency characteristic | 30 Hz to 50 kHz ± 1 dB |
| Signal-to-noise ratio | Phono:65dB Mic:60dB Aux, Tape : 75 dB Play/Rec:75dB |
| Damping factor | 50 (8 Ω, 1 kHz) |
| Tone control | Bass : ± 10 dB (100 Hz) Treble : ± 10 dB (10 kHz) |
| Loudness (at Vol-30dB) | + 7 dB (50 Hz), + 4 dB (10 kHz) |
| <General> | |
| Accessory circuit | Mike Headphone Pre-out main in AM/FM tuning meter Audio Muting Mode switch Tape monitor switch Microphone mixing volume Speaker A/B switching (A + B) FM stereo indicator FM Antenna Input (with 75 Ω connector) |
| Semiconductor used | FET : 1 Transistor : 39 IC : 4 Diode : 25 pcs |
| Power supply voltage | 100 VAC, 50Hz/60Hz |
| AC outlet | Power switch interlock : 50W Power switch not linked : 200W |
| Power consumption | 62W |
| External dimensions | Width 432x Height 134x Depth 322 mm |
| Weight | 9.5kg |
.jpg)