MITSUBISHI/DIATONE DA-44U
¥ 65,000 (released in 1970)
Commentary
Pre-main amplifier with all-silicon transistor configuration.
The power amplifier section uses a quasi complimentary service SEPPP OTL circuit.
A 4-series volume is used for the volume, and it is changed at both the input and output sides of the preamplifier.
This prevents the S / N ratio from deteriorating at low volume.
A 3-stage direct connection amplifier is used for the preamplifier section.
This 3-stage direct-coupled amplifier is also used in the equalizer amplifier section to achieve low distortion by applying sufficient negative feedback.
The tone control employs a CR-type step-type, and by switching each independent element with a rotary switch, an accurate and straightforward change curve is obtained.
In addition, it is equipped with a tone defeat switch, and flat characteristics can be obtained with one touch.
There are two types of speaker jacks available for switching.
Equipped with two Phono terminals.
It has a built-in MC head amplifier (* There are some catalogs without description, so I don't know.)
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Model Rating
| Type | Pre-main amplifier |
| Circuit system | Quasi complimentary service SEPPP OTL circuit |
| Power Amplifier Unit | |
| Output | 40W + 40W (8 Ω, continuous output) |
| Music power | 50W + 50W (8 Ω) |
| Frequency characteristic | 10 Hz to 100 kHz ± 1 dB |
| Signal-to-noise ratio | 80 dB or more |
| Total harmonic distortion factor | Not more than 0.1% |
| Cross modulation distortion factor | Not more than 0.2% |
| Damping factor | 30 ~ 50 (30 Hz ~ 15 kHz, 8 Ω) |
| Input Level / Impedance | 1 V (rms) / 100k Ω or More |
| Applicable load | 4 Ω ~ 16 Ω |
| Preamplifier Section | |
| Input Sensitivity / Impedance | * Listed in non-consolidated catalog Phono1 : 2mV/50k Ω Phono2 : 2mV/50k Ω, 100k Ω Tuner, Tape : 200mV/250k Ω Aux : 200mV/250k Ω |
| * Published in 1970 General Catalog Phono1 : 1.8mV/50k Ω Phono2 : 0.18mV/200 Ω, 1.8mV/50k Ω Tuner, Tape : 200mV/200k Ω Aux : Variable / 100k Ω |
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| Frequency characteristic | Phono1, 2 : 20 Hz to 20 kHz RIAA ± 0.5 dB Tuner, Aux, Tape : 10 Hz to 100 kHz ± 1 dB |
| Signal-to-noise ratio | Phono1 : 70 dB or more Phono2 : 70 dB or more (listed in the unit catalog) 65 dB or more (published in 1970 General Catalog) Tuner, Aux, Tape : 80 dB or more |
| Filter | High cut : -6dB (9 kHz), 12dB/oct. Low cut : -6dB (50 Hz), 12dB/oct. |
| Tone control | Bass : ± 10 dB (100 Hz), 2 dB step Treble : ± 10 dB (10 kHz), 2 dB step |
| Total harmonic distortion factor | Not more than 0.1% |
| Cross modulation distortion factor | Not more than 0.1% |
| Output level | Rating : 1 Vrms Maximum : 6 vrms |
| <General> | |
| Semiconductor used | Transistor : 31 Diode : 6 pcs |
| Pwer | AC100V |
| Power consumption | 120VA |
| External dimensions | Width 400x Height 120x Depth 330 mm |
| Weight | 8kg |