MITSUBISHI/DIATONE DA-33U
¥ 39,500 (released in 1970)
Commentary
Pre-main amplifier with all-silicon transistor configuration.
A quasi complimentary service SEPPP OTL circuit is used for the outputs.
A 3-stage direct connection amplifier is used for the preamplifier section.
In addition, a 3-stage direct-coupled equalizer amplifier is used to achieve low distortion by applying sufficient negative feedback.
There are two types of speaker terminals and they are switch-over type.
There are two Phono inputs.
The left and right channels are equipped with independent tone control.
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Model Rating
| Type | Pre-main amplifier |
| Circuit system | Quasi complimentary service SEPPP OTL circuit |
| Power Amplifier Unit | |
| Output | 30W + 30W (8 Ω, continuous output) |
| Music power | 35W + 35W (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 Sensitivity / Impedance | 1 V (rms) / 100k Ω or Less |
| Applicable load | 4 Ω ~ 16 Ω |
| Preamplifier Section | |
| Input Sensitivity / Impedance | Phono1, 2 : 3mV/50k Ω Tuner, Aux, Tape : 300mV/250k Ω |
| Frequency characteristic | Phono1, 2 : 20 Hz to 20 kHz ± 0.5 dB Tuner, Aux, Tape : 20 Hz to 100 kHz ± 1 dB |
| Signal-to-noise ratio | Phono1, 2 : 65 dB or more Tuner, Aux, Tape : 75 dB or higher |
| Filter | High cut : -6dB (9 kHz), 6dB/oct. Low cut : -6dB (50 Hz), 6dB/oct. |
| Tone control | Bass : ± 10 dB (100 Hz) Treble : ± 10 dB (10 kHz) With Defeat Switch |
| Total harmonic distortion factor | Not more than 0.1% |
| Cross modulation distortion factor | Not more than 0.1% |
| Muting | -20dB |
| Output level | Pre-out : rated 1 v (rms), maximum 6 v (rms) Rec out:300mV |
| <General> | |
| Pwer | AC100V |
| Power consumption | 75VA |
| External dimensions | Width 400x Height 120x Depth 330 mm |
| Weight | 7kg |