DIATONE DA-U480
¥ 34,000 (around 1978)
Commentary
Pre-main amplifier.
Model Rating
| Type | Pre-main amplifier |
| Circuit system | Power Amplifier Section : Pure complimentary service OCL (2-stage Differential, all stages directly connected) Equalizer amplifier : Positive and negative 2 power supply, high voltage IC |
| Continuous Output (20 Hz ~ 20 kHz) | 25W + 25W (8 Ω) |
| Harmonic distortion factor (20 Hz to 20 kHz, 8 Ω) |
Rated power : 0.1% At 13W output : 0.05% 0.05% at 1W output |
| Output Bandwidth (0.1% IHF Distortion) | 10 Hz to 40 kHz |
| Damping factor | 40 (1 kHz, 8 Ω) |
| Adaptive load impedance | 4 Ω ~ 16 Ω |
| Input Sensitivity / Impedance | Phono : 2.5mV/50k Ω Tuner, AUX, Play1, 2 : 150mV/50k Ω Mic : 2mV/10k Ω |
| Output Level / Impedance | Rec1, 2 : 150mV/600 Ω Headphone : 340mV/8 Ω |
| Frequency characteristic | Phono (RIAA deviation) : 20 Hz to 20 kHz ± 0.5 dB Tuner, AUX, Play : 10 hz to 60 khz + 0 -1dB |
| Phono maximum allowable input | 200 mv (1 khz, 0.1% distortion) |
| Tone control | Bass : ± 8 dB (100 Hz) Treble : ± 8 dB (10 kHz) |
| Loudness control | +6dB(100Hz) Volume -30dB : + 3 dB at 10 kHz |
| S/N ratio (IHF, A-network Input short) |
Phono:74dB Tuner, AUX, Play : 100 dB |
| Semiconductor used | IC : 2 Transistor : 26 Diode : 19 units |
| Pwer | AC100V 50Hz/60Hz |
| Power consumption | Power extraction capacity : 63W Rated output : 110W |
| Power Supply Side Fuse Capacity | 125 VAC, 3A |
| AC outlet | 2 routes (1A in total) |
| External dimensions | Width 480x Height 139x Depth 324 mm |
| Weight | 7kg |